H12-221-ENU Online Training Archives

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1. The differences between IGMP versions are: (Multiple Choice)

IGMPv1/v2 cannot elect the querier on its own, but IGMPv3 can.

For members leaving, IGMPv2/v3 can leave actively, but IGMPv1 cannot.

IGMPv1/v2/v3 cannot support the SSM model.

IGMPv1 does not support specific group queries but IGMPv2 support.

2. Different port roles are defined in the RSTP protocol, the role of the port that cannot be in the forwarding state is: (Multiple Choice)

Root Port

Designated Port

Backup Port

Alternate Port

3. About the definition of router roles within or between OSPF areas, which is correct? (Multiple Choice)

Internal router: refers to the router whose all interfaces belong to the same area.

ABR: A router that connects one or more areas and connects to the backbone area. These routers act as routing gateways for inter-domain communication.

Backbone router: refers to a router that has at least two interfaces that belong to the backbone area.

ASBR: It can be an internal router, a backbone router, or a regional edge router.

4. In a network running STP, multiple topology change informations are sent when the network topology changes. How many kinds of topology change informations are defined in the RSTP network?

One kind

Two kinds

Three kinds

Four kinds

5. What are the major parts of the SNAP address used by the IS-IS protocol? (Multiple Choice)

AREA ID

DSCP

SYSTEM ID

SEL

6. The following is part of the router RTA configuration, for the configuration description of this part, the correct is: (Multiple Choice)

A. A. Disable OSPF packet sending on interface gigabitethernet 1/0/0

B. The interface cannot send HELLO messages

C. The direct route of interface gigabitethernet 1/0/0 can still be advertised

D. Cannot form a neighbor relationship with the directly connected neighbor on this interface.

7. In which of the following states do BGP peers refuse to initiate or accept connection requests?

Established

Idle

Active

OpenConfirm

8. Which statements about OSPF packets are true? (Select 2 answers)

Hello packets can be sent immediately after the interface joined OSPF area.

After received LS Update packets, the router must send LSAck for confirming.

LS Update messages synchronize the link state database by sending detailed LSAs.

LS Update packets are sent only after an adjacency is established.

9. In the RSTP protocol, the uplink port of the non-root switch has the parameter of the port identifier. The port identifier consists of two parts, they are:

One-byte port priority and one-byte port number

One-byte port priority and two-byte port number

Two-byte port priority and one-byte port number

Two-byte port priority and two-byte port number

10. Since the AS-PATH attribute cannot be function within the AS, it is specified that the BGP router will not advertise any updates from the IBGP peer to its IBGP peers.

True

False

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11. In the static LACP mode, the correct description of the active link selection is: (Multiple Choice)

After a member interface is added to the Eth-Trunk in static LACP mode, the member interface sends the information negotiation active port about the system priority, system MAC address, interface priority, and interface number to the peer.

The higher the system LACP priority is, the higher the priority is. At both endsI of the devices, select the system with the larger LACP priority value as the active end. If the system LACP priority is the same, select the one with the higher MAC address as the active end.

The passive end device determines the activity interface based on the active end interface LACP priority and interface ID (interface number).

The interfaces selected by two-end device are inconsistent and the data can be forwarded normally.

12. Which of the following is the characteristics of the OSPF stub area?

AS-external-LSAs can be published in the Stub area.

The route to the outside of the AS can only be based on a default route generated manually by the AB

Virtual connections cannot span the Stub area.

Any area can be a stub area

13. The route injected into the BGP through the redistributed command has the Origin attribute of Incomplete.

True

False

14. Which of the following is incorrect about the OSPF protocol?

When a router receives a Network-Summary-LSA, the router runs the SPF algorithm.

Network-LSA is used to describe the link status information of the broadcast network segment and the NBMA network segment.

Virtual connection is a virtual link that belongs to the backbone area (Area 0).

Type-4 LSA is used to describe how to reach the ASBR and contain routing and topology information.

15. Autonomous System (AS) refers to a set of routers defined by users and using a unified routing policy.

True

False

16. As shown in the following figure, if you do not want employees of department A have mutual visits, employees in department B can communicate with each other, but different departments cannot communicate with each other, and all employees can access the company's servers. To achieve this function through the MUX VLAN, the following statement is correct:

VLAN 2 is set to interworking VLAN

VLAN 100 is a slave VLAN

VLAN 3 is set to primary VLAN

VLAN 3 is set to interworking VLAN

17. About multicast RPF check, which of the following statements is wrong? (Multiple Choice)

Multicast RPF check is not rely on unicast routing.

All multicast protocols use RPF check.

The router receives the multicast packet but fails the RPF check and discards the received multicast packet.

There are two RPF check functions. One is to prevent loops in multicast routes, the other is to prevent forwarding of redundant multicast data packets.

18. Regarding the description of IGMPv1 and IGMPv2, the correct one is: (Multiple Choice)

IGMPv1 packet type does not include a leave member packets.

IGMPv2 packet type includes member leave packets

IGMPv1 supports universal group queries.

IGMPv2 supports only general group queries.

19. How many types can the Hello packets of ISIS be divided into? (Multiple Choice)

Level-1 LAN IIH

Level-2 LAN IIH

Level-3 LAN IIH

P2P LAN IIH

20. When an operating OSPF router receives an LSA and the LSA does not exist in its link state database, how does the router handle this LSA?

The router will silently discard this LSA without returning any messages.

This LSA will be immediately flooded to other OSPF neighbors.

The LSA is installed in its own link state database, and then this LSA is acknowledged by multicast.

Check the age of the LSA to see if it expires.

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21. Which of the following description of the distribution tree is correct?

The multicast source is root, the multicast distribution tree that the multicast group members as leaves called RP

The RP (Rendezvous Point) is root, the multicast distribution tree that the multicast group members as leaves called SP

SPT applies to both PIM-DM and PIM-S

RPT applies to both PIM-DM and PIM-S

22. About the descriptions of LSA of various messages, which is wrong?

The DD type LSA contains only the summary information of the LSA, that is, the LS Type, LS ID, Advertising Router and LS Sequence Number.

The LS Request message contains only the LS Type, LS ID, and the Advertising Router.

The LS Update message contains the complete LSA information.

The LS Ack packet contains the complete LSA information.

23. About the description of P2MP networking, which is correct? (Multiple Choice)

Devices with inconsistent mask lengths on the P2MP network cannot establish neighbor relationships. However, you can use the ospf p2mp-mask-ignore command to break this limitation.

The election of DR/BDR is required in the P2MP network.

No link layer protocol is P2MP by default. P2MP must be forcibly changed by other network types.

You can use the filter-Isa-out peer command to filter the sent LSA on a P2MP network

24. Which of the following causes the BGP neighbor relationship failed to be established?

ACLs that block all TCP connections are configured between the two BGP neighbor relationships.

IBGP neighbors are non-physically connected.

BGP synchronization is enabled in the fully interconnected IBGP neighbor relationship.

The update time between the two BGP neighbors is inconsistent.

25. When using manual link aggregation mode, the wrong description of joining member interfaces in the following is:

The Eth-Trunk interface cannot be nested. That is, the member interface cannot be an Eth-Trunk.

An Ethernet interface only can be added to one Eth-Trunk interface. If you need to join other Eth-Trunk interfaces, you must first exit from the original Eth-Trunk interface.

If the local device uses an Eth-Trunk, the peer interface directly connected to the member interface must also be bundled into an Eth-Trunk interface so that the two ends can communicate normally.

Eth-Trunk has two working modes: Layer 2 working mode and Layer 3 working mode. The two working modes are automatically identified and no manual switching is required.

26. The master-slave relationship of OSPF neighbors is negotiated through DD packets.

True

False

27. Which types of access control lists can be divided into? (Multiple Choice)

Basic access control list

Advanced access control list

Layer 2 ACL

User-defined ACLs

28. IGMPv1 contains only two message types: membership query and membership report.

True

False

29. When two routers establish a logical BGP peer through multiple physical links, you must use the peer connect-interface command.

True

False

30. In a multicast network environment, if IGMPv1 hosts and IGMPv2 routers (hereinafter referred to as version 1 hosts and version 2 routers) are co-located on the same LAN, how do they work together? (Multiple Choice)

If there is a version 1 host in the LAN, all hosts must be required to use version 1.

Membership reports sent by version 1 hosts are always received by version 2 routers.

If a version 1 host exists in a specific group, the version 2 router must ignore any outgoing messages received in that group.

Version 2 routers must set a group-related countdown timer that considers the existence of the Version 1 host.

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31. When applying policy routing, which of the following descriptions are wrong? (Multiple Choice)

Apply strategy routing in the system view, in this case, strategy routing works on all packets received through this router.

Apply strategy routing in the system view, in this case, strategy routing takes effect only on packets generated locally.

Apply strategy routing in the interface view, in this case, strategy routing only affects the packets received and sent by the interface.

Apply strategy routing in the interface view, in this case, strategy routing only affects the packets received on the interface.

32. About the description of well-known attributes in BGP, which is correct? (Multiple Choice)

The well-known attributes are divided into two types: recognized mandatory and optional transition.

BGP must recognize all well-known attributes.

Well-known attributes are identifiled by all BGP routers and must exist in the Update message.

Well-known attributes are identifiled by all BGP routers, but it does not need to exist in the Update message.

33. About the description of static LACP mode, which of the following statement is wrong?

When you need to provide a large link bandwidth between two directly connected devices and the peer device does not support LACP, you can choose to use the manual load balancing mode.

In the static LACP mode, the higher the interface LACP priority is, the higher the priority is, and the easier it is to be selected as an active port.

In static LACP mode, the interface that forwards data is called the active interface, and the interface that does not forward data is called the inactive interface. Only when the active interface fails, the back-up interface can be changed from an inactive interface to an active interface.

If preemption is enabled, the high-priority backup interface becomes an active interface within a certain period after the active interface fails. If preemption is not enabled, the faulty interface cannot automatically become an active interface.

34. The MUX VLAN provides a mechanism for controlling network resources through VLANs. which of the following concepts do not belong to the MUX VLAN?

Primary VLAN

Slave VLAN

Guest VLAN

Interworking VLAN

35. In the process of BGP neighbor establishment, when the TCP cannot be established successfully, what is the state of the neighbor?

Idle

Active

OpenSent

Establish

36. For link-state routing protocols, filtering routes in the inbound direction can block the transmission of link state information. The effect of filtering is that the route cannot be added to the local routing table, and its neighbors cannot receive the complete route state information.

True

False

37. MSTP solves a lot of defects of RSTP and STP single spanning tree. As for the description of MSTP, the correct ones are:

Each MST instance uses a separate STP algorithm to compute a separate spanning tree.

Each MST Instance has an identifier (MSTID), and the MSTID is a one-byte integer.

By default, all VLANs are mapped to MST Instance 1.

MSTP allows one or more VLANs to be mapped to an MST instance. MSTP calculates the root switch for each MST instance and sets the port status.

38. When a router running BGP receives a route with an unreachable next hop, what should I do?

Send an error message to the router that issued the Update.

Refused to join the BGP routing table and silently discarded.

Receive the route and add it to the BGP routing table. But this route will not be preferred by BGP and will not join the IP routing table.

Receive the route, join the BGP routing table, and participate in the BGP routing rules. It may be optimized as the best route and join the IP routing table.

39. OSPF can support multiple network types. Which of the following network types requires election DR and BDR? (Multiple Choice)

P2P

NBMA

P2MP

BROADCAST

40. What are the BGP attributes that can be used in the apply clause in the route-policy? (Please select 3 answers)

Local-Preference

Tag

MED

AS-Path

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41. What mechanism does the IS-IS protocol use to ensure the reliability of neighbor relationship establishment on broadcast networks?

Status synchronization

Checksum

Aging timer

Three-way handshake

42. What is the default hello interval sent by DIS in the broadcast type network?

10s

3.3S

40s

43. About the description of BGP loop protection, which is correct? (Multiple Choice)

For EBGP, the AS-PATH attribute is used to discard any update information received from the EBGP peer that contains its own AS number in the AS-PATH attribute.

For IBGP, the BGP router does not advertise any updates from IBGP peers to its IBGP peers.

For IBGP, the AS-PATH attribute is used to discard any update information contained in the AS-PATH attribute contained in the AS-PATH attribute from the EBGP peer.

For EBGP, the BGP router does not advertise any updates from EBGP peers to its EBGP peers.

44. As shown in the figure, an OSPF multi-process is configured on the RT1 router, wherein process 100 of RT1 establishes an OSPF neighbor through the backbone area with RT2, and process 200 establishes an OSPF neighbor through the backbone area with RT3.

Please select the wrong options:

The OSPF process on router RT2 can use process 100 and RT1 to establish neighbors.

Because both RT1-RT2 and RT1-RT3 establish neighbors through the backbone area, the RT2 OSPF process has the LSA generated by the RT1 OSPF process.

The router RT1 public network routing table has routes to RT2 and RT3.

The router RT3 public network routing table has OSPF routes to RT1 and RT2 routers.

45. In an OSPF routing protocol, the types of LSA involved in the calculation of intra-area routes are only Router-LSA, Network-LSA and Summary LSA.

A. True

B. False

46. Which type of LSA as following can carry the TAG information of an external route?

LSA5

LSA4

LSA3

LSA2

47. Which of the following does the routing prefix meet the requirement of IP-Prefix? (Multiple Choice)

20.0.1.0/23

20.0.1.0/24

20.0.1.0/25

20.0.1.0/28

48. About the Stub area, full Stub area and NSSA, whichi is correct?

A. The Stub area can only flood Type 3 LSAs, and the full Stub area cannot flood any Type 3 LSA (including the default route LSA).

B. The biggest difference between a fully stub area and a stub area is that cannot flood the Type 3 LSA.

C. Stub area can import AS external routes. The NSSA cannot import AS external routes.

D. Stub areas can flood Type 3 and Type 4 LSAs. Full Stub areas cannot flood Type 3 and Type 4 LSAs (except Type 3 LSAs that advertise default routes).

49. The following is a output information of a router:

The router ID of this router is 1.1.1.1.

The router's AS number is 100.

The router and neighbor 2.2.2.2 are IBGP neighbors.

The router uses BGP version 3 to negotiate with the neighbor.

50. Which of the following command is used to check Type 2 LAS detailed information?

display ospf Isdb network

display ip ospf Isdb network

display ospf Isdb router

display ip ospf Isdb router

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51. About the description of MUX VLAN, which is wrong?

Each Group VLAN must have a Principal VLAN bound to it.

If the VLAN ID is already used for the principal VLAN, the VLAN can no longer be used for VLANIF interfaces, super VLANs and sub VLANs.

After MUX VLAN is enabled on a port, you can use it again for VLAN mapping and VLAN stacking configuration.

Enterprises can use the Principal PORT to connect to enterprise servers, separate PORT to connect enterprise customers and Group PORT to connect enterprise employees. In this way, enterprise customers and enterprise employees can access enterprise servers, and internal employees can communicate, enterprise customers cannot communicate, and enterprise customers and enterprise employees cannot communicate with each other.

52. MSTP is also called multiple spanning tree protocol. What problems can be solved in a single spanning tree network through MSTP? (Multiple Choice)

Part of the Vlan path is inaccessible.

Unable to use traffic sharing.

Suboptimal Layer 2 path.

Improve business reliability.

53. The LS Sequence Number is used to detect expired and repeated LSA. It is a 32-bit signed integer, so the maximum LS Sequence Number is 0x7FFFFFFE.

A. True

B. False

54. When using routing policy for route filtering, which will be denied when the router prefix matching the following IP-Prefix? (Multiple Choice)

1.1.1.1/24

1.1.1.1/32

1.1.1.1/26

1.1.1.2/16

55. The wrong description about OSPF route aggregation is:

Route aggregation means to aggregate the routing information of the same prefix and only advertise one route to other areas.

Through route aggregation, routing information can be reduced, thereby reducing the size of the routing table and improving the performance of the router.

OSPF has two route aggregation modes: ABR aggregation and ASBR aggregation

Route aggregation can be performed on any router in OSPF

56. The following is a partial configuration of a router. The correct description about this part of the configuration is:

On the 10.0.192.0/8 network segment, the route with a mask length of 18 will be matched to the prefix list, the matching rule is allowed.

On the 10.0.192.0/8 network segment, the route with a mask length of 19 will be matched to the prefix list, the matching rule is allowed.

On the 10.0.192.0/8 network segment, the route with a mask length of 20 will be matched to the prefix list, the matching rule is allowed.

On the 10.0.192.0/8 network segment, the route with a mask length of 21 will be matched to the prefix list, the matching rule is allowed.

57. About the description of connection type of Router-LSA, which is wrong?

Point-to-Point describes a point-to-point connection from this router to a neighboring router.

TransNet describes the connection from this router to a Transit network segment.

StubNet describes a connection from this router to a Stub network segment.

P2MP describes the connection from a local router to multiple neighboring routers.

58. Although the STP protocol can solve the loop problem, the slow convergence of the network topology affects the user communication quality.

RSTP has made many improvements to STP. Which of the following is not an improvement of RSTP to STP?

RSTP has deleted 3 kinds of port states and added 2 kinds of port roles.

The RSTP port state specification is based on whether the port forwards user traffic and learns the MAC address, reducing the original five port states to three.

The non-root switch running RSTP sends configuration BPDUs at the interval specified by the Hello Timer. This behavior is completely performed by each device.

If a port does not receive configuration BPDUs from the upstream device within 4 consecutive Hello Time durations, the device considers that negotiation with this neighbor fails.

59. Compared to STP, the RSTP protocol defines different port states, including Discarding and Learning. About the description of the two port states, the correct is: (Multiple Choice)

The ports in these two states do not forward data frames.

Ports in Discarding state do not learn the MAC address table.

Ports in the Learning state do not learn the MAC address table.

All ports in Discarding state and Learning state do not learn MAC address table

60. In the RSTP network as shown in the figure, according to the configuration of the SWC in the figure, it can be determined that the type of the E0/1 port of the SWC is: (Multiple Choice)

Designated port

Root port

Alternate Port

Edge port

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61. The following is a partial output configuration of the Huawei router. The correct description about the configuration of this part is:

When the router advertises its own BGP routes to BGP neighbor 12.12.12.2, it will be allowed to advertise routes from 10.0.0.0 to 10.255.255.255.

When the router advertises its own BGP routes to BGP neighbor 12.12.12.2, it will allow advertisement of routes from 172.16.0.0 to 172.31.255.255.

When the router advertises its own BGP routes to BGP neighbor 12.12.12.2, it will filter out the routes from 172.16.0.0 to 172.31.255.255.

When the router advertises its own BGP routes to BGP neighbor 12.12.12.2, it filters out all routes.

62. In the same LAN, if some IGMPv1 routers exist in the LAN, IGMPv1 must be forcibly configured for all routers in the subnet to use normally.

True

False

63. The matching order of ACL can be out of accordance with sequencing of user configuring the rules for the ACL.

True

False

64. The description of OSPF ASBR-Summary-LSA, which is incorrect?

A. Link State ID indicates the ASBR's router ID.

B. Advertising Router indicates the ABR Router ID.

C. The Advertising Router field are the same in all areas of ASBR-Summary-LSA.

D. Metric indicates the OSPF cost for the ABR reach to the ASBR.

65. Regarding the description of OSPF external route types, which is wrong?

OSPF is divided into the first type of external routes and the second type of external routes.

The cost of the first external route of OSPF is the sum of the internal cost of AS (the router-to-ASBR overhead) and the AS external cost.

The cost of the second type of OSPF external route is AS external cost.

With the same other conditions, the first type of external route of OSPF is always preferred over the second type of external route.

66. The above is part of the information output by the router Huawei. The following description which is wrong?

Use display pim rp-info command to check the RP information corresponding to the multicast group.

The RP address is 2.2.2.2.

The priority of the RP is 0.

The group address is 225.0.0.0.

67. Which of the following OSPF state transitions are correct? (Multiple choices)

The result of the Loading Done event in the Loading state is the state transition to Full.

The result of the NegotiationDone event in the Exstart state is the state transition to Full.

The result of the ExchangeDone event in the Exchange state is the state transition to Exstart.

The result of the ExchangeDone event in the Exchange state is the state transition to Loading.

68. Regarding the cost of the routing protocol, which of the following description is incorrect?

Because different routing protocols have different basis for calculating route costs, automatic conversion is generally recommended when routes are imported.

Because different routing protocols have different basis for calculating route costs, manual configuration is generally recommended when routes are imported.

Generally, the cost of ISIS and OSPF is based on the bandwidth. The value range is very large.

Usually the cost of RIP is based on the number of hops and the range of values is small.

69. When the BGP Notification packet Error Code is 2, it indicates that the OPEN message is incorrect. Which of the following error codes is included?

1 - Unsupported version number

2 - Wrong peer AS number

3 - Bad BGP RID

4 - Wrong attribute list

70. By default, the SSM group is in the range of 232.0.0.0/8. If you want to modify the SSM group range, which of the following is correct?

Configure the ssm-policy acl-number in the system view.

Configure the ssm-policy advanced-acl-number in the system view.

Configure the ssm-policy acl-number in the PIM view.

Configure the ssm-policy advanced-acl-number in the PIM view.

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71. Agreate command (aggregate ipy4-address { mask | mask-length } [ as-set I attribute-policy route-policy-name1 I detail-suppressed I origin-policy route-policy-name2 I suppress-policy route-policy-name3]) There are several parameters that can be used to control the aggregation process and results, which of the descriptions are wrong? (Multiple choices)

Configure the as-set parameter. The generated AS-Path of an aggregated route contains all the AS-Paths of the detailed route. The AS-Path is ordered to avoid routing loops.

The suppress-policy can generate an aggregated route, but suppress the detailed route matching the route-policy to advertise to other neighbors. You can use the if-match clause of the route-policy to selectively suppress some specific routes. That is, the route matching the policy will be suppressed, but other routes that fail the policy will not be suppressed and still be advertised.

Origin-policy selects all detailed routes to generate aggregated routes.

attribute-policy is used to set the attribute of the detail route.

72. The description of the LSA header information in the AS-External-LSA of OSPF, which is wrong?

Link State ID indicates the destination network address.

Advertising Router indicates the router ID of ASB

Net mask indicates the network mask of the destination network segment.

Forwarding Address is always 0.0.0.0.

73. The following description of EGP and IGP, which is wrong?

IGP is a routing protocol that runs inside an A

EGP is a routing protocol that runs between A

IGP focuses on controlling the propagation of routes and selecting the optimal route.

EGP itself is an ancient protocol.

74. The following description of Local-Preference, which is correct?

Local-Preference is recognized as mandatory.

Local-Preference affects the traffic entering the A

Local-Preference can be spread across A

The default value of Local-Preference is 100.

75. Thedescription about OSPF features, which is wrong?

OSPF uses the link state algorithm.

Each router advertises local link state information through flooding LSAs.

Each OSPF device collects the LSA which sent by other routers. All the LSA are put together to form the link state database LSD

The LSDB of all routers in OSPF area 0 are the same.

According to the directed graph, each router uses the SPF algorithm to calculate a shortest path tree rooted at itself. This tree gives the routes to each node in the autonomous system.

76. The following statement about OSPF neighbor information:

The router ID of this router is 1.1.1.1

The neighbor's router ID is 2.2.2.2

The address of DR is 10.1.1.1

This router is Master

77. The community attribute of the route set through routing policy, does it affect route routing?

Indirectly, the route can be classified by setting the Community property of the route, and then different route routing related attributes such as Local_Pre, MED, etc. can be set according to the category, thereby affecting the purpose of route selection.

Can't be affected because the Community attribute of the route is non-transitional and can't be passed between routers.

Indirectly, the route can be classified by setting the community attribute of the route, and then different route selection related attributes can be set according to the categories. These attributes can only include Local_Pre and MED, thus affecting route selection.

After the router receives a route update with the community attribute No_Advertise, it will not be advertised outside the local A

78. As shown in the figure, Router ABR1 (Router ID: 100.0.0.22) imports a RIP route 10.0.0.0/24. Viewing the LSDB of router RT1 has the ASE LSA with an LS ID of 10.0.0.0 generated by ASBR1, but the routing table of RT1 does not have a corresponding route.

The possible causes are: (Multiple choices)

Router ASBR1 does not generate ASBR SUMMARY LSA with LS ID 100.0.0.22 to Area 2.

Router ABR1 does not generate ASBR SUMMARY LSA with LS ID 100.0.0.22 to Area 0.

Router ABR2 does not generate ASBR SUMMARY LSA with LS ID 100.0.0.22 to Area 0.

Router ABR3 does not generate ASBR SUMMARY LSA with LS ID 100.0.0.22 to Area 1.

Router RT1 does not have an OSPF Inter-area route to the forwarding address 100.1.1.9.

Router RT1 does not have an OSPF external (ASE) route to the forwarding address 100.1.1.9.

79. The description of LACP protocol, which is correct? (Multiple choices)

Based on the IEEE802.3au standard.

Interact with the peer through the Link Aggregation Control Protocol Data Unit (LACPDU).

The device at both ends determines the active end based on the system LACP priority and system I

The device at both ends determines the active interface based on the passive interface LACP priority and interface I

80. As shown in the figure, on the network running the RSTP protocol, the original root port of the SWC is faulty and the port is in the Down state. In this case, the network goes through which processes to achieve stability?

The prepared port on the SWC becomes the new root port and enters to Forwarding state after passing through the Learning state.

The prepared port on the SWC becomes the new root port and enters to Forwarding state directly.

SWC newly elects the root port and enters to Forwarding state after learning.

SWC newly elects the root port and enters to Forwarding state directly.

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81. The following description about OSPF packet authentication, which is wrong?

The authentication modes supported by AR2200 are classified into null, simple, MD5 and HMAC-MD5 based on the encryption algorithm.

AR2200 supports two authentication modes: area authentication and interface authentication.

When both the area authentication mode and the interface authentication mode exist, use area authentication first.

Only authenticated OSPF packets are accepted. Otherwise, neighbors cannot be set up normally.

82. About alarm information “OSPF/2/IFAUTFAIL (OID) [1.3.6.1.2.1.14.16.2.6]: A packet is received on a non-virtual interface from a muter whose authentication key or authentication type conflicts with the local authentication key or authentication type. （ IfIpAddress=[ip-address], AddressLessIf=[interface-index], ProcessId=[process-id], RouterId=[muter-id], PacketSrc=[source-ip-address],ConfigErrorType=[error-type], PacketType=[packet-type], InstanceName=[instance-name] ） ” which description is wrong?

It may be due to incorrect interface verification.

It may be due to inconsistent HELLO intervals.

It may be due to a mismatch in subnet masks.

It may be due to an error in the area number mismatch.

83. Policy-based-route does not support which of the following policies is used to specify the packet forwarding path:

Source address

Destination address

Source MAC

Packet length

84. Which can have ability to define a set of BGP attributes with a public destination address?

Origin

Community

AS_PATH

MED

85. Which is correct about OSPF AS-External-LSA? (Multiple choices)

A. Link State ID is set as the destination network segment address.

B. Advertising Router is set to ASBR Router ID.

C. Net mask is set to all 0.

D. Link State ID and the Advertising Router can uniquely identify an AS-External-LSA.

86. About the basic concepts of link aggregation, the following description which is wrong?

Link aggregation is a method of binding a group of physical interfaces together as a logical interface to increase bandwidth and reliability.

Link aggregation follows the IEEE 802.3ad protocol.

Logical links formed by binding multiple physical links are called link aggregation groups (LAGs) or trunk.

There are only active interfaces for link aggregation.

87. On non-broadcast networks, OSPF has two operating modes, non-broadcast multiple access and point-to-multipoint, and non-broadcast multiple access requires election of DR/BDR.

True

False

88. VRP Version By default, when the route-policy of BGP neighbor is changed, BGP will automatically send a refresh to this neighbor to request the neighbor to resend the Update message.

True

False

89. The above is the output information of router. The neighbor relationship between the router and the neighbor 2.2.2.2 is in the Adroe state analysis. Which of the following is the most likely reason?

It may be TCP port 179 is disabled.

It may be due to not receiving the KEEPALVIE packet from the other party.

It may be due to not receiving the other party's update message.

It may be due to a problem with OPEN negotiation.

90. In BGP routing rules, routes with high MED values take precedence.

True

False

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91. In multicast network environment, if IGMPv2 hosts and IGMPv1 routers (hereinafter referred to as version 2 host and version 1 router) are co-located on the same LAN, how do they work together?

version 1 router treats the IGMPv2 report as an invalid IGMP message type and ignores it.

When version 1 router is a valid IGMP querier, the version 2 host must send an IGMPv1 report.

When Version 2 host detects that the IGMP Querier is Version 1 router, it must always respond with the IGMPv1 report.

When version 2 host leaves, it still sends an IGMP leave message, and the message can’t be suppressed.

92. Which of the following commands can enable the IS-IS protocol on an interface?

ip router isis 100

router isis 100

isis enable 100

route isis enable 100

93. Multiple BGP processes can’t be configured on a single router.

True

False

94. The description of summary automatic command and BGP aggregation, which is wrong?

This command is used to enable automatic aggregation of locally imported routes.

After this command is configured, BGP aggregates routes according to the natural network segment.

After this command is configured, BGP only sends the aggregated route to the peer.

After this command is configured, BGF no longer receives the subnet routes advertised by IG

Therefore, the number of routing information can be reduced.

This command is used to implement automatic aggregation. It has a higher priority than manual aggregation.

95. In the MSTP protocol, each MST Instance uses the RSTP algorithm alone to calculate a separate spanning tree.

True

False

96. Compared with the OSPF protocol, which are the features of IS-IS protocol? (Multiple choices)

More types of network are supported

More types of areas are supported

The scalability of the protocol is better

Less protocol packets

97. Which of the following is wrong about multicasting? (Multiple choices)

The unicast technology and broadcast technology can't solve the problem of single send and multi-point receive. Only multicast technology can solve it.

Multicast technology is used in most "single-to-multiple" data distribution applications.

Because multicast technology is based on TCP, multicast technology can ensure the reliable transmission of packets.

Multicast technology can reduce redundant traffic and save network bandwidth.

98. The following is a section of the MUX VLAN, about the configuration of the master VLAN and the slave VLAN. Which is correct? (Multiple choices)

VLAN 10 is the master VLA

VLAN 11 is the master VLA

VLAN 12 is an isolated slave VLA

Both VLAN 11 and VLAN 12 are slave VLANs.

Both VLAN 10 and VLAN 11 are MUX VLANs.

99. The OSFF NBMA network requires that routers in the network must select DR and BDR; otherwise, they can’t work.

True

False

100. About MUX VLAN, which is correct?

MUX VLAN is divided into master VLAN and slave VLA

The master VLAN and slave VLAN can't communicate with each other.

In MUX VLAN, slave VLAN are classified into interworking and isolated slave VLA

Ports in the interworking VLAN can communicate with each other.

Isolation ports on the slave VLAN can communicate with each other, and ports on the master VLAN can't communicate with each other.

The master VLAN and slave VLAN can't communicate with each other.

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101. Compared with the traditional STP, RSTP defines two different port roles. Which is correct? (Multiple choices)

The primary port is used to back up the root port, and the backup port is mainly used to back up the specified port.

If the designated switch of the network segment is the switch to which this port belongs, the port status is set to the standby port.

The backup port is in the forwarding state and the owning switch is the designated switch of the network segment to which the port is connected.

The standby port is in the forwarding state and the owning switch is not the designated switch of the network segment to which the port is connected.

Neither the backup port nor the standby port is in the forwarding state.

102. The correct description of the prefix list is? (Multiple choices)

The prefix list is used to filter IP prefix. It also can match the prefix number and prefix length at the same time.

The prefix list is used to filter IP prefix. It can't match prefix number and prefix lengths at the same time.

The prefix list can't be used for packet filtering.

Prefix list can be used for packet filtering.

103. The following about MUX VLAN, which is correct?

You do not need to configure the master VLAN and then configure the slave VLAN in the MUX VLA

MUX VLAN must configure MUX VLAN enable function on the port to implement the normal MUX VLAN function.

The master VLAN and slave VLAN can be the same VLAN in the MUX VLA

Only one interworking slave VLAN can be configured in the MUX VLA

104. IS-IS routers with an interface priority of 0 can’t participate in DIS election.

True

False

105. The prefix (IP-Prefix) can be used for routing information filtering.

True

False

106. The ABR in OSPF full-stub area does not flood Type III, Type IV and Type-5 LSA to the area. Therefore, the ABR in the full-stub area needs to manually send a default route to the area to instruct the packet how to reach the destination outside the AS.

True

False

107. Which of the following can't inject local routes into BGP? (Multiple choices)

Through the network command

Receive Routes from Peers

Through summary automatic command

Through import command

108. IGMP Snooping operates at the data link layer to manage and control multicast groups and solves the problem of multicast messages broadcast at Layer 3.

True

False

109. Which of the following routes meet the following ACL conditions? (Multiple choices)

10.1.1.1/32

10.1.2.1/32

10.1.3.1/32

10.1.4.1/32

110. When the BGP versions supported by two BGP neighbors are inconsistent, the neighbors negotiate the highest BGP version supported on both sides.

True

False

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111. Which types of metrics are supported by IS-IS protocol?

Narrow

Tos

wide

default

112. On the device running MSTP obtain the information as shown in the figure. Note that the status of the port on Ethernet 1/0/13 in Instance 1 is:

Forwarding

Discarding

ALTE

NONE

113. When the RIP protocol use the default-route originate command to send a default route to a neighbor, you can use this command to set which attributes of the default route at the same time?

Cost

AS-PATH

Interface

Nexthop

114. In OSPF protocol, which of the following statements is wrong?

The network mask field in the Hello packet received on the broadcast network must be consistent with the network mask of the receiving port.

Hello Interval field in the received Hello packet must be consistent with the configuration of the receiving port.

Dead Interval field in the received Hello packet must be consistent with the configuration of the receiving port.

MTU in the received Hello packet must be consistent with the configuration of the receiving port.

115. Regarding OSPF multi-process, which is wrong?

The concept of OSPF multi-process has a global significance.

An interface of a router can only belong to one OSPF process.

Routing interaction between different OSPF processes is equivalent to the routing interaction between different routing protocols.

Multiple OSPF processes can be running on the same router. They do not affect each other and are independent of each other.

116. About multicast routing, which are correct? (Multiple choices)

Multicast routing protocols are used to establish and maintain multicast routes and forward multicast packets correctly and efficiently.

Multicast routing forms a one-way loop-free data transmission path from a data source to multiple receivers, that is, a multicast distribution tree.

Multicast routing protocols are divided into intra-domain multicast routing and inter-domain multicast routing protocols.

The multicast routing protocol includes the IGMP protocol.

117. The OSPF NBMA network type requires that routers in the network must select DR and BDR; otherwise, they can’t work.

True

False

118. Port isolation provides users with more safer and more flexible networking solution.

The following description about port isolation, which is incorrect?

Port isolation can be used to configure Layer 2 isolation.

In the default mode, port isolation is Layer 2 isolation and Layer 3 interworking.

Port isolation must be configured on the ports that need to be configured for port isolation.

Port isolation command port-isolate enable specifies the port configuration in global mode.

119. In the network as shown in the figure, all switches run the RSTP protocol. If the E1 interface of SWB failure, the RSTP process is? (Multiple choices)

SWB deletes the port list that use E1 as the destination port in the MAC address table.

Recalculate the spanning tree and elect E2 as the new root port.

Topology change notification is sent out on all forwarding ports to inform other switch networks that a topology change has occurred.

Topology change notification is sent out on all non-edge forwarding ports to inform other switch networks that a topology change has occurred.

120. Each DD packet has DD sequence number, which is used to confirm the DD packet. DD contains complete link status information.

True

False

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121. The following is part of the output information of the router RTD, the correct description of the output information is:

The version of IGMP enabled on this interface is version 1.

IGMP status of this interface is down.

Configure the interval for sending IGMP query messages on this interface to be 60s.

The maximum response time 0s contained in IGMP query message on this interface.

122. Compared to STP, RSTP protocol defines different port roles. For the description of the standby port and backup port in RSTP, which is correct? (Multiple selection)

The port is prepared to back up the root port.

The backup port backs up the designated port.

The switch to which the backup port belongs is not the designated switch of the network segment to which the port is connected.

The switch to which the standby port belongs is the designated switch of the network segment to which the port is connected.

123. If BGP route load balancing is configured, if there are two BGP routes, the two BGP routes in the "BGP Route Selection Rule". If the first 8 attributes described are exactly the same, and the AS_Path attribute is also the same, how do you advertise this prefix route to neighbors?

Both load segment routes are advertised to other BGP neighbors.

An optimal route is preferred from two routes and advertised to other BGP neighbors.

Both routes are not advertised to neighbors.

Only one optimal route is selected and advertised to IBGP neighbors.

124. By default, the OSPF port cost is related to the bandwidth of the port. The calculation formula is bandwidth-reference/bandwith. The port cost can only be calculated by OSPF and cannot be changed manually.

True

False

125. Which of the following configurations must be included in order for the non-aligned EBGP neighbours to be built properly?

peer connect-interface

peer ebgp-max-hop

peer ignore

peer as-number

126. Which description of the OSPF protocol in the following is wrong?

The area border router (ABR) connects multiple areas and maintains the same LSDB for all areas.

The metric value of AS-external-LSA can be specified when external routes are imported. The default value is 1.

The external routing information can carry a tag. The tag information is contained in 5 LSAs and 7 LSAs.

The Link State ID in ASBR-Summary-LSA is set to the router ID of this ASB

127. Which of the following description of OSPF features is correct?

The OSPF area boundary is on the link.

OSPF is in the broadcast network. All routers form adjacencies.

If one LSA must age, any router can advertise LSA aging messages.

Generally, all non-backbone areas of OSPF must be connected to the backbone area.

128. In a multicast network environment, if IGMPv2 hosts and IGMPv1 routers (hereinafter referred to as version 2 hosts and version 1 routers) are co-located on the same LAN, how do they work together? (Multiple Choices)

The version 1 router treats the IGMPv2 report as an invalid IGMP message type and ignores it.

When the version 1 router is a valid IGMP querier, the version 2 host must send an IGMPv1 report.

When the Version 2 host detects that the IGMP Querier is a Version 1 router, it must always respond with the IGMPv1 report.

When the version 2 host leaves, it still sends an IGMP leave message and the message cannot be suppressed

129. Port isolation enables the isolation of communication between different ports within the same VLAN of the same switch.

True

False

130. Which of the description of RP In PIM-SM is wrong?

All the multicast streams in the Shared tree are forwarded to the receiver via R

RP can be responsible for the forwarding of several or all multicast groups, and there can be an RP in the network.

An RP can serve multiple multicast groups simultaneously, but a multicast group can only correspond to multiple RP

All of the group members and the multicast source that sent the multicast data to the group were all converged on the unique R

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131. In the same LAN, if some IGMPv1 routers exist in the LAN, IGMPv1 must be forcibly configured for all routers in the subnet to use normally.

True

False

132. Which are the reasons RSTP converges faster than STP? (Multiple choices)

The concept of an edge port was introduced in RST

An edge port does not receive processing configuration BPDUs and does not participate in RSTP operations. It can change from Disable to Forwarding state.

If one of the root ports in the network fails, the optimal alternate port in the network will become the root port and enter the Forwarding state.

In RSTP, after a port is elected as a designated port, it first enters the Discarding state, and then quickly enters the Forwarding state through the Proposal/Agreement mechanism.

When a port receives an RST BPDU from an upstream designated bridge in RSTP, the port compares the stored RST BPDU with the received RST BPD

If a designated port in the network fails, the optimal alternate port in the network becomes the designated port and enters the Forwarding state.

133. OSPF supports multiple processes that can run multiple different OSPF processes on the same router, and they are independent of each other. Routing interactions between different OSPF processes correspond to routing interactions between different routing protocols.

True

False

134. Which one is wrong with the virtual connection in OSPF?

Virtual connection can be used to solve the problem of discontinuity in the backbone area logic.

Virtual connections can be established on any two regional border routers, but require that the two border routers have ports connected to a common non-backbone area.

Virtual connections may not belong to the backbone area, which region should be determined according to the actual topology.

Virtual connection belongs to region 0.

135. Which of the following understanding of DR/BDR is wrong? (Multiple choices)

All DRothers only establish neighbor relationships with DRs and BDRs.

In the broadcast network, DR and BDR must be elected. Without either DR or BDR, the broadcast network does not work.

The multicast address monitored by DRother is 224.0.0.5.

The network address monitored by DRother is 224.0.0.6.

136. The import-route limit command cannot limit the maximum number of external routes that can be imported in an OSPF process.

True

False

137. By default, when the route-policy of a BGP neighbor is changed, VRP requires manual operation to re-send an Update message to the neighbor.

True

False

138. Which of the description about the port isolation of Huawei switch provides the function of configuring port isolation?

A. The port isolation mode can be configured as Layer 2 and Layer 3 isolation or Layer 2 isolation as Layer 3 interworking.

B. Huawei switches support 64 isolation groups, numbered 0~63.

C. If it is isolated from interface B on interface A, the packets sent from interface A cannot reach interface B, but the packets sent from interface B can reach interface A.

D. Interface unidirectional isolation supports mixed isolation of four types of interfaces: E, GE, XGE, and Eth-Trunk. However, it does not support unidirectional isolation of an interface from itself, unidirectional isolation of an interface from a management network interface, and Eth-Trunk and its member interfaces. One-way isolation.

139. In the RSTP protocol, when the network topology changes, which is the mechanism for responding to the topology change?

Flooding across the entire network

Modify the lifetime of the MAC address table

Partial deletion of the MAC address table

Delete the entire MAC address table

140. Which description of this configuration is wrong?

When the TC protection function is enabled, the frequency of MSTP process processing type BPDU message can be configured in the unit time.

Enable the TC protection function, can avoid attackers forge topology changes BPDU packets to malicious attacks switching equipment, and caused the frequent relating to delete MAC address table and the ARP table, so as to achieve the purpose of the protection switching equipment.

Execute the command STP tc-protection enable, enabling the protection function of the MSTP process tc type BPDU message.

By default, the TC protection function of the switching equipment is in the state of failure.

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141. Which of the following descriptions are incorrect regarding the BGP AS number range? (Multiple choices)

When a 2-byte AS is supported, the private AS number ranges from 32768 to 65535.

When supporting 2-byte AS, private AS numbers range from 64512 to 65535.

When supporting 2-byte AS, the value range is 0~65535.

When supporting 4-byte AS, there is no need to define new attributes.

142. Which of description about MSTP different port roles is wrong?

In MSTP, other port roles are involved in the calculation process of MSTP except edge ports.

MSTP the same port can play different roles in different spanning tree instances.

MSTP domain edge port refers to the port on the edge of the MST domain and connects to other MST domains or SST ports.

The Backup port serves as a backup of the root port, providing another switchable path from the designated bridge to the root.

143. Among BGP's commonly used routing policy tools, which of the following can be used to add or delete AS paths?

ip-prefix

filter-policy

ip as-path-filer

community-filter

144. The following description about OSPF packets is incorrect:

Router Priority has a higher election priority.

The Router Priority is as large as the router I

The election with the greater router ID takes precedence.

If the current DR fails, the current BDR automatically becomes the new DR and the network re-elections BD

When there is a new router in the OSPF network with the largest Priority router added, the new route will preempt the original D

145. In OSPF, the selected DR and BDR in the broadcast type network listen for 224.0.0.5 addresses and 224.0.0.6 addresses.

True

False

146. Which of the following is the BGP part of the router A configuration, according to the configuration, determine the following options are correct? (Multiple choices)

Router A is in AS10.

Router A introduces its own direct route in BG

The origin attribute of this direct route is identified as i.

Router A and neighbor 200.1.4.2 are EBGP neighbors.

Router A and neighbor 200.1.2.2 are IBGP neighbors.

147. Which of the following description about the need to pay attention to the configuration of the Stub area is correct?

The backbone area can be configured as a Stub area.

If you configure an area as a stub area, configure the stub area attributes for all routers in the area.

The ASBR may exist in the Stub area.

The virtual connection can cross the Stub area.

148. Which of the following description of the routing policy supported by OSPF route filtering is wrong?

route-policy

access-list

prefix-list

as-path filter

149. Which of the following description of BGP features is wrong?

BGP is an external routing protocol used to transfer routing information between ASs.

BGP is a link state protocol.

BGP supports CID

BGP has a rich route filtering and routing strategy.

150. Which of the following information description about a router BGP error output information is wrong?

The Error Type is displayed due to a wrong neighbor relationship.

The time of the error occurred on March 22, 2010 at 11:40:39.

The router's neighbor address is 10.1.1.2.

The cause of the error may be due to a miswriting of the peer AS number.

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151. When the MTUs of the interconnected interfaces of the two routers in the broadcast network do not match, Which of the description of the changes in the state of the neighbor relationships between the two routers is correct?

The status of the neighbor relationship between the two devices stays in the Init state.

The neighbor relationship status of the two devices stays at 2-way.

The neighbor relationship between the two devices stays at Exstart.

The neighbor relationship between two devices can enter Full.

152. Routing protocol is used for different priority agreement found routing assign different priorities, so that when a router at the same time learning from different routing protocols to the same routing, can have a choice of priority.

True

False

153. Which of the following regarding the routing ID description in dynamic routing protocols is wrong?

If the router-id is manually configured using the router-id command, the router-id is used.

If the router-id is not manually configured and the loopback interface address is configured, the router ID with the largest loopback interface address is selected as the router I

If no router-id is configured and no loopback interface address is configured, the largest router ID is selected from the IP address of the physical interface.

After the Router ID is changed, the Router ID of each protocol changes, and no additional operations are required.

154. The RTA is the source DR router, and the RTB is the RP router. The multicast source sends multicast data to the RTA. However, the source multicast source to which the PIM Register message is registered cannot be found on the RTB.What are the reasons in the following? (Multiple choices)

A. There is no unicast route from RTB to RTA.

B. RTA routers cannot learn RP information.

C. There is no multicast route from RTA to RTB.

D. The RP learned by RTA is not RTB.

155. Which of following the multicast distribution tree is wrong?

The multicast distribution trees are generally divided into two types: SPT and RP

The PIM-SM protocol can generate both RPT trees and SPT trees.

The PIM-DM protocol can generate both RPT trees and SPT trees.

The PIM-DM protocol can only generate SPT trees.

156. By default, VRP automatically aggregates the routes imported by BGP.

True

False

157. The peer default-mute-advertise command is used by BGP to advertise default routes to neighbors. At the same time. Which of the description of the changes in the local BGP routing table is correct?

An inactive default route is generated in the local BGP routing table but is not delivered to the IP routing table.

An active default route is generated in the local BGP routing table and delivered to the IP routing table.

No impact, no default route is generated in the local BGP routing table.

Generate a default route in the local BGP routing table and send it to the IP routing table based on the routing result.

158. Which command can be used to check the statistics of the routes calculated by the OSPF process?

display ospf cumulative

display ospf spf-statistics

display ospf global-statistic

display ospf request-queue

159. Which of the following BGP reliable routing updates is correct?

BGP works on the transport layer and the UDP protocol number is 179.

BGP does not require periodic updates.

BGP sends complete routing table information for each route update.

The BGP sends an OPEN packet to detect TCP connectivity.

BGP uses multicast updates.

160. Which of the following description about the contents of the display bgp routing-table command output is correct?

A. A. The route to the destination address 192.168.1.0 is injected into the BGP routing table through the network command.

B. The route to the destination address 192.168.1.0 was learned through AS200.

C. The route to the destination address 192.168.1.0 is not optimal in the BGP routing table.

D. The MED value of the route to the destination address 192.168.1.0 is 100.

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161. For link-state routing protocols, in the direction of routing, filtering can actually block the link-state information transmission, the effect of filtering is routing cannot be added to the local routing table, and its neighbors also cannot receive the complete routing state information.

True

False

162. Which of the following descriptions is wrong in the process of building a connection between BGP neighbors? (Multiple choices)

BGP neighbors can only have one TCP connection in the process.

BGP neighbor if two TCP connections are established, one will be the main connection and the other will be backup.

BGP neighbors will close one of the two TCP connections through the conflict management principle.

BGP's principle to deal with TCP conflicts is to maintain a TCP connection initiated by a neighbor of BGP I

163. Which of the description of BGP packet types and packet characteristics is incorrect?

The OPEN message is responsible for establishing a neighbor relationship with the peer.

HELLO messages are sent periodically between peers to maintain the connection.

UPDATE messages are used to pass routing information between BGP peers.

NOTIFICATIO

messages are used to pass error messages between BGP SPEAKE

ROUTE-REFRESH is used to notify peers of their ability to support route refresh.

164. There is a difference between the RSTP protocol and the STP protocol. When defining the port state in the RSTP protocol, what port states are defined?

Discarding state

Learning state

Forwarding state

Discarding state, Learning state and Forwarding state.

165. Which the following description about Network-Summary-LSA is correct?

When a router receives a Network-Summary-LSA, the router runs the SPF algorithm.

When a router receives a Network-Summary-LSA, the router does not run the SPF algorithm.

Network-Summary-LSA is generated by AB

Network-Summary-LSA is generated by ASB

166. Which of the following description is to verify whether a received hello message is legally wrong?

If the network type of the receiving port is broadcast, point-to-multipoint or NBMA, the network mask field in the received Hello message and the interface can be inconsistent.

If the network type of the receiving port is point-to-point type or virtual link, the Network Mask field is not checked.

The RouterDeadInteral field in the received Hello message must be consistent with the configuration of the receiving port.

The E-bit in the Options field in the received Hello message must be consistent with the configuration of the related area.

167. A Router-LSA can describe multiple connections, each connection is described by Link ID, Data, Type, and Metirc. Which of the following description of Link ID, Data, Type and Metirc is correct? (Multiple choice)

Type represents the Type of connection.

Link ID represents the local identity of this connection, and the different connection type Link ID means different meanings.

Data is used to describe additional information about this connection, and the information described by different connection types is different.

Metric describes the overhead of this connection.

168. Which description of OSPF route aggregation commands is correct?(Multiple choices)

advertise is the default parameter of the abr-summary command. That is, if you configure the abr-summary command without specifying not-advertise, it defaults to advertise.

not-advertise is the default parameter of the abr-summary command. That is, if the abr-summary command is not specified for advertise or not-advertise, the default is not-advertise.

The abr-summary command is a command in the OSPF area view.

asbr-summary command is a command in the OSPF view.

169. OSPF divides the boundaries of the area on the router.

True

False

170. Which multicast MAC address is used by the Level-2 router as the destination address for sending the IIH in the IS-IS broadcast network?

0180-c200-0014

0180-c200-0016

0180-c200-0015

0100-5E00-0002

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171. For the PIM-DM protocol, when an upstream interface receives a graft message, which of the following need to send packets to the downstream router?

Join

Assert

Graft

Graft-ACK

172. In the BGP routing rules, which is the priority judgment principle of the Origin attribute?

EGP > Incomplete > IGP

IGP > Incomplete > EGP

IGP > EGP > Incomplete

Incomplete > EGP > IGP

173. Which of the following is incorrect description of BGP neighbors? (Multiple choices)

Manually configuring BGP neighbors

Establishing a TCP Connection between Two Neighboring Routers

BGP peers exchange link state information

MD5 authentication must be configured between BGP peers.

174. The ABRs in an OSPF stub area do not flood Type 5 LSAs, Type 4 LSAs, and Type 3 LSAs into the Stub area. Therefore, the Stub area does not have AS external routing capabilities. The ABR in the Stub area advertises a default route to the area to guide the data. How the package reaches the destination outside the AS.

True

False

175. Which of the following description about LSA3, LSA4, and LSA5 is correct?

LSA3 will not change after crossing different areas; LSA4 and LSA5 will change.

LSA4 will not change after crossing different areas; LSA3 and LSA5 will change.

LSA5 will not change after crossing different areas; LSA3 and LSA4 will change.

LSA3, LSA4, and LSA5 do not change after crossing different areas.

176. Which of the following options meets the following ACL conditions?

10.1.1.1/32

10.1.1.0/24

10.1.0.0/16

10.0.0.0/8

177. Which multicast MAC address is used by the Level-1 router as the destination address for sending the IIH in the IS-IS broadcast network?

0180-c200-0014

0180-c200-0015

0180-c200-0000

0100-5E00-0001

178. Which of the following LSAs are spread only in a single area? (Multiple choices)

Router LSA

Network LSA

Summary LSA

AS External LSA

179. When configuring BGP, if such an alarm is generated: "BGP/6/ESTABLISHED: OID [oid] The BGP FSM enters the Established state. (BgpPeerRemoteAddr = [BgpPeerRemoteAddrValue], BgpPeerLastError = [BgpPeerLastErrorValue], BgpPeerState = [BgpPeerStateValue] ])" Which of the following description is correct?

The BGP neighbor has been established.

The alarm information is abnormal information and must be processed.

Explain the problem of OPEN message negotiation between BGP neighbors.

Explain that the problem of TCP resulted in such alarm.

180. Which of the following tools is used to filter routing information and set routing properties for filtered routing information?

as-path-filter

IP-Prefix

route-policy

policy-based-route

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181. What is the role of the detail-suppressed keyword in the Aggreate command?

Suppressing the Generated Aggregate Routes to Advertise the IP Routing Table

Suppress the IP routing table delivered by the summarized detailed route

Only advertise aggregated routes to other BGP neighbors

Advertise Aggregate Routes and Detail Routes to Other BGP Neighbors

182. Which of the description of PIM-DM is wrong?

PIM-DM is called protocol-independent multicast-intensive mode and belongs to dense mode multicast routing protocol.

PIM-DM assumes that there is at least one receiving station interested in the multicast source for each subnet in the network.

PIM-DM actively uses the Graft graft mechanism to restore the forwarding of multicast packets.

There is no periodic diffusion and pruning of PIM-D

183. Which of the description of the shortest path tree for OSPF is correct?

The first stage calculates the Stub network segment, and the second phase calculates the router node and Transit segment.

The first stage calculates the Stub network segment, and the second phase calculates the routing node.

The first phase calculates the routing node and Transit network segment, and the second stage calculates the Stub network segment.

The first phase calculates the routing node and the second stage calculates the Stub network segment.

184. Which of the following description of the rules of route filtering is wrong?

Route filtering can filter routes in the outbound direction, and both route information and link state information can be filtered.

Route filtering can filter routes in the inbound direction. For link-state routing protocols, only routes are not added to the routing table.

Route filtering can filter routes imported from other routing protocols, but it can only be filtered in the outbound direction.

You can use filter-policy for filtering, or use ip-prefix for filtering.

185. In static LACP mode, the active interfaces selected by the devices at both ends must be the same; otherwise, the link aggregation group cannot be established. However, one end can be designated as the active end, and the other end can only select the corresponding active interface according to the high-priority end.So how to choose the active end in static LACP mode?

Select the lower LACP priority of the two devices as the active end. If the LACP priority of the system is the same, select the end with the smaller IP address as the active end.

Select the smaller end of the MAC address as the active end at both ends.

Select one of the two devices with the higher LACP priority as the active end. If the LACP priority of the system is the same, select the one with the higher MAC address as the active end.

Select the system LACP priority at the two ends as the active end. If the system LACP priority is the same, select the one with the lower MAC address as the active end.

186. Which of the following description about the LSA age field is correct? (Multiple choices)

A. The unit of LSA age is second, and the LS age of the LSA in the LSDB decreases with time.

B. The unit of LSA age is seconds, and the LS age of the LSA in the LSDB grows with time.

C. If the LSA age of an LSA reaches LSRefreshTime (30 min), the LSA producer needs to regenerate an LSA instance.

D. If the LSA age of an LSA reaches LSRefreshTime (30 min), any router can regenerate an LSA instance for this LSA.

187. The use of the access control list is determined by the range of numbers.Which of the following description is wrong?

The numerical range of the basic access control list is: 2000~2999.

The numerical range of the basic access control list is: 3000~3999.

The numerical range of the advanced access control list is: 3000~3999.

The numerical range of Layer 2 ACL is: 4000~4999.

188. BGP is an inter-domain routing protocol. Which of the following description about the protocol is correct? (Multiple choice)

The BGP protocol uses a reliable transmission protocol.

Supports automatic discovery of neighbors.

Support clear text verification.

Supports rich routing strategies.

189. RSTP provides different protection features under different scenarios. Which of the following statement is wrong?

After the BPDU protection function is enabled on the switching device, if the edge port receives an RST BPDU, the edge port will be set to a non-edge port and spanning tree calculation will be performed again.

The specified port with root protection enabled can only maintain the port role as the specified port.

Start the designated port for root protection. When the port receives a better RST BPDU, the port enters the Discarding state and no more packets are forwarded. If the port does not receive a better RST BPDU within a period of time, it will automatically return to the normal Forwarding state.

After the TC-BPDU attack defense function is enabled, the number of times the switching device processes TC BFDU packets can be configured per unit time.

190. Regarding port isolation, which of the following statement is wrong?

Port isolation is an access control security control mechanism between switch ports.

Clients wishing to access PCs from different ports cannot communicate with each other, which can achieve through port isolation.

Port isolation can be isolated based on VLANs.

Port isolation is isolation of physical layer.

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191. In a network environment, there are both switches that run RSTP and run STP. What is the phenomenon that the network will appear? (Multiple choice)

RSTP and STP are not interoperable and will perform independent operations.

RSTP can interoperate with STP, but RSTP advantages such as fast convergence will be lost at this time.

If it is a Huawei switching device, RSTP will be switched to STP mode, and the switching device running STP can be configured to be evacuated from the network. After this, RSTP switching devices can be migrated back to the RSTP mode.

If it is a Huawei switching device, STP will be switched to RSTP mode, and after the switching device that can run RSTP is configured to be evacuated from the network, the switching device running STP can be migrated back to the RSTP mode.

192. Which of the following description of AS_PATH is wrong?

AS_PATH refers to the list of ASs that BGP routes experience in the path of transmission.

AS_PATH is a very important recognized mandatory attribute in BG

BGP will not accept routes that contain the AS Number in the AS_PATH attribute.

When there are two or more routes to the same destination in the router, these routes can use this attribute to compare the advantages and disadvantages of each other. The longer the AS_PATH, the higher the priority.

193. Which of the following description about the features of the prefix list is wrong?

The prefix list can be used to filter the IP prefix.

The prefix list can match the prefix number and prefix length.

The prefix list has a stronger matching function for the route prefix than the access control list.

Prefix list can be used for packet filtering.

194. About the description of IGMP Snooping, which of the following is correct? (Multiple choice)

IGMP Snooping solves the problem of multicast broadcast at Layer 3.

IGMP Snooping operates at the link layer and is a multicast constraint mechanism on Layer 2 Ethernet switches for managing and controlling multicast groups.

IGMP Snooping establishes a MAC multicast address table by listening to the IGMP messages sent by hosts.

IGMP Snooping does not consume the CPU of the switch.

195. Regarding Register messages, which of the following statement is wrong?

The role of the Register message is to make the RP router learn the multicast source information.

196. Which of the following protocol used the SPF algorithm?

RIPv1

RIPv2

OSPF

BGP

197. OSPF runs directly over the TCP protocol and uses TCP port number 179.

True

False

198. Link Aggregation is a method of binding a group of physical interfaces together as a logical interface to increase the bandwidth. Link aggregation control protocols fall into the following two types: manual load sharing and static LACP.

True

False

199. On the VRP platform, when we import OSPF or ISIS routes to RIP, if you do not specify a COST, the cost value is set to 16 by default.

True

False

200. Which of the following attributes must exist in the BGP Update packet?

AS-PATH

LOCAL-PREF

PrefVaI

MED

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201. Which of the following commands can be used to leak level-2 area routes to the level-1 area?

import isis level-2 into level-1

import-route iris level-2 into level-1

advertise isis level-2 into level-1

export isis level-2 into level-1

202. Which of the following is the default route that OSPF supports? (Multiple choice)

can be issued on the ABR

can be issued on the ASBR

Can only be forced to issue

Can be issued without force

203. By default, the BGP speaker must set up an IBGP connection with other BGP peers so that IBGP peers can successfully advertise the routing information. In this manner, IBGP peers are interconnected throughout the AS.

True

False

204. When the Hold Time parameter negotiated by the two BGP neighbors is 0, no Keeplive packet is sent.

True

False

205. In the OSPF routing protocol, the unit of the bandwidth-reference command is Mbps.

True

False

206. Which route prefixes in the following options are deny when matching the following IP-Prefix when using routing policy for route filtering? (Multiple choice)

1.1.1.1/24

1.1.1.1/32

1.1.1.1/26

1.1.1.2/16

207. Which of the following is not a recognized attribute in a BGP route attribute?

AS_PATH

Origin

MED

Local_Pref

208. When the TCP connection is normal and the AS number configured on the BGP peer is different from the BGP version configured on the neighboring router, the neighbor usually sends a Notification message to disconnect after establishing a TCP connection and interacting with certain information. Then, the Error Code in the Notification message will identify what message was wrong during the negotiation?

Route-refresh

Open

Keepalive

Update

209. The following describes the information contained in the OPEN packet in BGP. Which of the following is wrong?

OPEN message contains VERSION information.

OPEN message contains local AS number information.

OPEN message contains the Hold time message.

BGP packet header is in the OPEN packet.

210. In the network shown in the figure, three switches run RSTP. The configuration is as shown in the figure.

According to the configuration in the figure, determine the root switch as:

SWA

SWB

SWC

Unable to determine

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211. Which of the following description about the OSPF LSA format is incorrect?

A. LS age field indicates the time that the LSA has survived. The unit is seconds.

B. LS type field identifies the format and function of the LSA.

C. Advertising Routes field in the Type-1 LSA indicates the router ID of the router that originated the LSA.

D. The smaller the LS sequence number, the newer the LSA.

212. If the receiver does not exist in the PIM-SM network, the router with multicast routing entries is:

Source DR router

Receiver router

Last hop router

RP router

213. The name of the assertion mechanism in PIM-SM is:

BSR/RP mechanism

Assert mechanism

Join/Prune mechanism

214. IGMP Snooping mainly solves () problems.

The receiver host only supports the IGMPv2 protocol, but the SSM multicast model is used in the network.

There are a large number of receiver hosts on the network segment. The router will receive a large number of IGMP Report messages.

Solve the broadcast problem of multicast data packets on Layer 2 devices. It is used to manage and control the forwarding of multicast data packets.

The legality of IGMP Report messages.

215. In an OSPF broadcast or NBMA network type, a device with a large router priority does not necessarily become a DR.

True

False

216. About the OSPF command description, which on is incorrect? (Multiple choice)

The configuration difference between the stub area and the totally stub area is that the totally stub is configured with the no-summary parameter.

The stub muter command configures this router as a stub router. A stub router can form a neighbor relationship with a non-stub router.

In the OSPFv3 configuration, you do not need to use the router-id command to configure the router-id. The configuration is the same as that of OSPFv2.

The difference between the OSPFv2 and OSPFv3 configuration interface commands is that OSPFv2 uses the network command and OSPFv3 is enabled on the interface.

217. What command can trigger the outgoing BGP route advertisement without interrupting the BGP connection?

rr-filter

refresh bgp all internal

refresh bgp all external

reset bgp

218. An advanced ACL is a series of ordered rules composed of the permit | deny statement. Which of the following attributes can be used by these rules to describe IP packets? (Multiple choice)

Source address

Destination address

Port number

Types and Message Codes of ICMP Messages

219. RSTP provides multiple protection functions. For example, when an edge port is configured as a protection state, after the edge port receives BPDU packets, what is the processing?

Forward BPDU packets as required.

Discard the BPDU packets directly.

Close the port.

Obtain related information after parsing BPDU packets.

220. Among the OSPF neighbor relationships listed below, which state is the only one that occurs in the NBMA network?

Down

Init

Attempt

2-way

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221. About the advantages of IGMP snooping, which of the following description is correct? (Multiple choice)

Reduce broadcast packets on Layer 2 networks and save bandwidth.

The security of multicast information is enhanced.

Provides convenience for individual billing for each user host.

IGMP consumes a large number of CPUs of Layer 2 switches and is not recommended.

222. In a company network environment, there are two switches SWA and SWB. The link aggregation LACP mode is adopted between the SWA and the SWB. There are three links added to the link aggregation, and the maximum number of active links is set to two. The system priority of the SWA is 4096. The system priority of the SWB is 32768. The interfaces of the three SWA links are G0/0/1, G0/0/2, and G0/0/3. The priority of the interface is 10, 20, 30. The interfaces of the three SWB links are G0/0/1, G0/0/2, and G0/0/3. The priority of the interface is 30, 20, and 10 respectively.

Which of the following conclusions are correct? (Multiple choice)

SWA is active

SWB is active

SWA G0/0/1 and G0/0/2 are active interfaces

SWB G0/0/2 and G0/0/3 are active interfaces

223. Which of the following statement about the OSPF protocol is correct? (Multiple choice)

There are three types of endpoints in the OSPF topology: router nodes, stub network segments, and transit network segments.

A broadcast network segment or NBMA network segment with at least two routers is a Transit network segment.

The OSPF default bandwidth reference is 100 Mbit/s.

The cost of a router from a Transit segment to the network segment is 100.

224. On broadcast or NBMA networks, not all neighbors establish adjacencies.

True

False

225. A switch runs MSTP. The relevant configuration information is shown in the figure. According to the configuration of the command, it indicates that for Instance 1, the role of the switch is:

Root switch

Slave switch

Non-root switch

Cannot judge

226. For the BPDU packet flag defined in the RSTP protocol and the BPDU packet flag defined in the STP protocol. What are the different fields?

Topology notification flags

Topology change flag

Topology Change Confirmation Flag

Topology Change Flags and Topology Notification Flags

227. With regard to the description that the BGP neighbor relationship cannot be established, which of the following analysis is wrong?

It is possible that TCP port 179 is disabled, causing the neighbor to fail to establish.

It is possible that the BGP neighbor is unreachable and the neighbor cannot be established.

OPEN message may be incorrect during the negotiation. As a result, the neighbor relationship cannot be established.

When establishing an indirectly connected EBGP neighbor relationship, the default EBGP update packet's TTL is 2 and it has not been changed manually. As a result, the neighbor cannot be established.

228. Use the OSPF vlink-peer command to configure a virtual connection. The peer router-id is specified.

True

False

229. The order of matching of access control lists is divided into two types: configuration order and automatic sorting.

True

False

230. Which of the following description about the multicast protocol is wrong?

IGMP runs between the receiver host and the multicast router. This protocol defines the mechanism for establishing and maintaining multicast membership between hosts and routers.

DVRMP is a distance vector multicast routing protocol, which is a dense mode protocol. The protocol has a hop limit and the maximum number of hops is 32 hops.

PIM is a typical intra-domain multicast routing protocol and is divided into DM (Dense Mode) and SM (Sparse Mode) models.

MSDP can advertise multicast routes across ASs.

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231. Define the route-policy Set-cost as follows, which of the following description is correct?

The route 11.1.0.0/16 can pass node 10 and its cost is set to 300.

The route 11.1.0.0/16 will continue to match d2node 20 after passing node 10, and the final cost is set to 200.

The cost of all routes will be set to 200.

All routes that do not pass node 10 will be rejected.

232. Given the configuration of RTA below, which of the following description about the configuration is wrong? (Multiple choice)

multicast routing-enable command is to enable multicast. If this command is not configured, the router does not forward multicast packets.

Use the igmp enable command to enable IGMP on the interface. If you do not configure the multicast routing-enable command first, igmp enable can be used as usual.

IGMP version supported by this interface is version 2. If this command is not configured, the interface runs IGMPv1 by default.

The router listens to the multicast address 224.0.0.2 by default.

233. What kind of BGP routes will send BGP neighbors without enabling BGP path load balancing?

All BGP routes learned from all neighbors.

Only routes learned from IBG

Only learned routes from EBG

Only the best route that is preferred by BG

234. When the Hold Time supported by the two BGP neighbors are inconsistent, the neighbors negotiate the lowest Hold Time interval that the two ends can support.

True

False

235. The Link ID of the third LSA is:

A. Router ID of the router that generates this SA.

B. The port IP address of the DR on the described network segment.

C. The described destination network segment.

D. Router ID of the described ABR.

236. Which of the following types of packets are supported by BGP? (Multiple choice)

Keepalive

Open

Update

Hello

237. About this section configuration, which of the following descriptions are correct? (Multiple choice)

stp mode mstp command is used to enable the MSTP feature of the switch. By default, MSTP is switched on.

region-name RegionA command configures the MST region name of the switch. By default, the MST region name of the switch is the MAC address of the switch.

The revision-level 1 is used to configure the MSTP revision level. The value range is 0 to 65535. By default, the MSTP revision level is 1.

Use the instance 2 vlan 3 command is used to map VLAN 3 to MST Instance 2. All the default VLANs are mapped to Instance 1.

The active region-configuration command is used to activate the configuration of the MST region. If you do not perform this operation, the configured domain name, VLAN mapping table, and MSTP revision level do not take effect.

238. The following output of a router, which of the following description of this information is correct?

The next hop of the route to the destination network 1.1.1.0/24 is 1.1.1.1, and the route is optimal.

The next hop of the route to the destination network 5.1.1.0/24 is 1.1.1.1, and the route is optimal.

MED value of the route to the destination network 1.1.1.0/24 is 100.

MED value of the route to the destination network 5.1.1.0/24 is 50.

239. Which of the following destination address of PIM protocol packet is a unicast address? (Multiple choice)

Assert

Bootstrap

Graft

240. In the OSPF routing protocol, under the same conditions, the second type of external route is always preferred over the first type of external route.

True

False

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241. Which of the following OSPF areas needs to reach other areas through the default route?

Backbone area

Virtual connection area

totally stub area

Republish area

242. Which of the following description of the virtual link is wrong?

If there is a virtual link in the network, it usually indicates that the network design has problems and needs to be optimized.

The existence of virtual links increases the complexity of the network.

Virtual links may bring loops.

The time interval for sending HELLO on the virtual link is 10s.

243. In the OSPF protocol, you cannot use the LS Sequence Number and LS age to determine the age of the same LSA.

A. True

B. False

244. RSTP has been improved on the basis of STP and realized fast convergence of the network topology. However, both RSTP and STP are based on a single spanning tree, and there are some defects, such as: (Multiple choice)

The load balancing of data traffic cannot be implemented between VLANs.

will result in problem that some VLAN paths cannot be reached.

Problems with suboptimal paths.

After the link is blocked, no traffic will be carried, which will result in wasted bandwidth.

After the link is blocked, some traffic will be carried, which will not result in wasted bandwidth.

245. What are the commands that can check OSPF neighbors on the VRP platform?

display ospf peer

display ospf interface

display ospf Isdb

display ospf routing

246. When different networks use different routing protocols, and these networks need to share routing information, you can set route import. In BGP, routes can only be routed through the network.

True

False

247. Regarding the description of the PIM-SM forwarding tree, which of the following is wrong?

PIM-SM includes two kinds of trees: shared tree and source path tree.

The path from RP to multicast receiver data is called a shared tree.

The data forwarding path from the multicast source to the RP is called the source path tree.

In the shared tree, the RPF check uses the multicast source address as the detection address.

248. For IGP routing to become a BGP route, only the network command can be used.

True

False

249. In an RSTP-enabled network, there are devices running STP. When the RSTP switch discovers that the topology changes, the method of informing the STP switch of the topology change is as follows:

Topology change flag BPDUs using the RSTP protocol.

Topology change notification BPDUs using the STP protocol.

Topology change confirmation flag BPDU using the RSTP protocol.

Topology change confirmation flag BPDU using the STP protocol.

250. Which of the following description about OSPF default route is wrong?

OSPF default route can be advertised by the ABR to Type3 Default Summary LSA to guide routers in the area to forward packets between areas.

OSPF default route is that ASBR can advertise Type 5 external default ASE LSAs or Type 7 external default NSSA LSAs to instruct the routers in the autonomous system (AS) to forward the packets outside A

When the router does not have a precisely matched route, it can forward packets through the default route.

Due to the OSC management by the OSPM, the Type 5/7 default route has a higher priority than the Type 3 route.

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251. In BGP routing rules, routing with high value of Local_Pref is preferred.

TRUE

FALSE

252. Which description about the characteristics of the routing policy is correct?

Forwarding based on the destination address according to the routing table

Based on the forwarding plane, service for forwarding strategy.

Manual hop-by-hop configuration is required to ensure that packets are forwarded according to policies.

Apply application command policy-based-route.

253. In BGP routing rules, the manual aggregate route generated by the aggregate command has a higher priority than the automatic route generated by the automatic summary command.

TRUE

FALSE

254. What are the routes that can be used to filter routes in BGP commonly used routing policy tools?

ip extcommunity-filter

route-policy

filter-policy

peer-list

255. Which message types are included in OSPF? (Multiple Choice)

Hello

Database Description

Link State Request

Link State DD

Link State Advertisement

256. Which of the following OSPF state transitions are possible? (Multiple Choice)

Down->Init 。

Down->2-Way 。

Loading->Full 。

Init->2-Way 。

257. Which description about the above information is wrong?

The network segment 168.32.0.0/16 is aggregated by configuring this command.

Router A will advertise the details about the 168.32.0.0/16 network segment to neighbors.

By setting the as-set keyword, you can create an aggregation route. The AS path of this route contains the AS path information of the specific route, and the AS number is ordered.

Aggregated routes carry the community attributes of all the original routes.

258. If a fast failure detection mechanism needs to be performed on a certain network segment, which description is wrong in the following possible configuration methods? (Multiple Choice)

Reduce the Holdtime of Join/Prune messages.

Reduce the interval for the interface to send Hello messages.

Establish PIM BFD sessions between network neighbors.

Reduce the interval for sending periodic Join/Prune messages.

259. Which of the following parameters are not required when configuring BGP peers? (Multiple Choice)

IP Address

description

as-number

password

260. Which description about the permanent multicast address is wrong?

All hosts and routers in the network segment listen 224.0.0.1.

All routers listen 224.0.0.2.

All routers running OSPF protocol listen 224.0.0.5.

All routers running the RIPv2 protocol listen 224.0.0.100.

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261. If the OSPF neighbor relationship fails to be established, you can view the information through the display ospf error command. If the following information is displayed, what may be the cause of the failure of neighbor establishment?

Router ID conflict

The area ID does not match

Inconsistent network mask

MTU inconsistent

262. What type of network does the ISIS protocol support except P2P?

P2MP

NBMA

SNAP

LAN (broadcast network)

263. Which of the following description about DR is correct?

In the network segment DR election, when the DR priority is the same, the bigger IP address is elected.

The source DR is responsible for sending Register messages with multicasting to the R

The receiver DR is responsible for sending Join messages to the multicast source or R

Assert Winner on the shared network segment may not be the network segment D

264. Two level-1 routers in different areas can form a neighbor relationship.

TRUE

FALSE

265. Which of the following description about ABR in OSPF is wrong?

There are multiple LSDBs on ABR and ABR maintains one LSDB for each area.

The ABR abstracts the link state information in the connected non-backbone areas into routing information and advertises it to the backbone area.

ABR also abstracts the link state information of the backbone area into routing information and publishes it to all non-backbone areas.

ABR can generate LSA3, LSA4, and LSA5 information.

266. The source tree uses the shortest path from the multicast source to the receiver, so it is called the shortest path tree SPT.

TRUE

FALSE

267. The first 4 bits of the IP multicast address are fixed 1110 and correspond to the high 25 bits of the multicast MAC address. In the last 28 bits of the IP multicast address, only 23 bits are mapped to the MAC address, so 5 bits of address information are lost. As a direct result, 32 IP multicast addresses are mapped to the same MAC address.

TRUE

FALSE