H12-261_V3.0-ENU Online Training Archives

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1. Which of the following statements about RSTP root protection is true? (Multiple Choice)

The root protection function on the root port will take effect

The port with root protection enabled will enter the error-down state after receiving the RST BDPU with higher priority

It is recommended to enable it on the switch at the edge of the network

After the port with root protection enabled receives RST BPDUs with higher priority and does not receive RST BPDUs with higher priority for a period of time, it will return to the normal forwarding state

2. Unlike STP, RSTP has only one BPDU type, the value is 2, and there is no TCN BPDU.

TRUE

FALSE

3. As shown in the figure, Client1, Client2, and Client3 serve as clients of RR1 at the same time, and R1 introduces 10 routes.

Assuming that the BGP configuration is correct and all neighbor relationships have been established, how many routing entries exist in the BGP routing table of Client3?

4. OSPFv3 adopts the same route advertisement method as OSPFv2: it is advertised through the network command in the OSPFv3 area view.

TRUE

False

5. In the topology shown in the figure, what type of LSA will not be generated on R1 when the entire network runs OSPFv3 without importing external routes?

Intra-Area-Prefix-LSA

Inter-Area-Router LSA

Link-LSA

Inter-Area-Prefix-LSA

6. IS-IS is a link-state routing protocol that uses the SPF algorithm for route calculation. As shown in the figure, a campus deploys both IPv4 and IPv6, also runs IS-IS to achieve network interconnection. R2 only supports IPv4.

Which of the following statements is true about the topology calculation of this network?

By default, since R2 does not support IPv6, so in the shortest path tree formed by IPv6 network calculation, the path for R1 to access R4 is: R1-R3-R4

If you want IPv4 and IPv6 network computation to form the same shortest path tree, you need to run the ipv6 enable topology ipv6 command to enable the IPv6 capability in the IS-IS process

By default, in the shortest path tree formed by IPv6 network calculation, the path for R1 to access R4 is R1-R2-R4. Since R2 does not support IPv6, R2 will directly discard IPv6 packets after receiving them, causing traffic lost

By default, IPv4 and IPv6 networks will be calculated separately to form different shortest path trees

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

as-number

password

peer’s IP Address

description

8. Link state information is isolated by default between different IS-IS processes on the same router.

TRUE

FALSE

9. Which of the following statements about the multicast address used by 0SPFv3 is correct? (Multiple Choice)

The DR router uses FF02: :6

The DR router uses FF08::6

All OSPF routers use FF08:5

All OSPF routers use FF02::5

10. As shown in the figure, PE1 and PE2 exchange private network routing information with their CEs through OSPF, and the same Domain ID is configured on PEI and PE2.

When importing routes from BGP to OSPF on PE2, which of the following types of LSAs may be passed to CE2? (Multiple Choice)

Type7 LSA

Type5 LSA

Type3 LSA

Type1 LSA

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11. A medium-sized campus network manages the network through the SNMP protocol. The campus has high network security.

Which SNMP version is recommended for management?

SNMPv1

SNMPv2C

SNMPv3

All versions can be implemented

12. In a VXLAN network, which can realize traffic access to the VXLAN network, and can also be used for communication with the same subnet in the same XLAN network?

NVE interface

VXVAN L2 Gateway

VXLAN L3 Gateway

VLANIF interface

13. What are the problems with manually creating static VXLAN tunnels in a campus network? (Multiple Choice)

Although the static VXLAN tunnel mode can support distributed gateway application scenarios, the configuration workload is large and the configuration adjustment is complicated.

When N devices establish static VXLAN tunnels, at most N (N-1)/2 tunnels need to be manually configured, and the amount of configuration is large.

VTEP can only rely on data flooding to learn the remote MAC address

Static VLAN tunnels also use related protocols on the control plane, which will cause device resource consumption

14. The DHCP protocol can assign some TCP/IP-related parameter information to the client. In this process, DHCP defines a variety of packets. The encapsulation protocol used by these packets at the transport layer is:

PPP encapsulation

IP encapsulation

TCP encapsulation

UDP encapsulation

15. After a switch is powered on, it joins a running stack system. This behavior is called stack join.

TRUE

FALSE

16. In the multi-level RR scenario, a large number of secondary RRs will be connected to the primary RR, which may cause the BGP routing table of the primary RR to overflow.

What method can be used to reduce the risk of overflowing the the primary RR BGP routing table?

ORF

Routing Control

Route Aggregation

Set the same Cluster-ID

17. In BGP4+, what is the content of the next hop network address field carried by the MIP_REACH_NLRI attribute in the Update packet?

Can be just a link-local address

Only link-local addresses

Can carry link-local addresses and global unicast addresses at the same time

Can only be a global unicast address

18. The following descriptions about Link ID, Data, Type and Metirc in Router-LSA, which are correct? (Multiple Choice)

Metric describes the cost of this connection

Link ID indicates the local identification of this connection, and different connection types indicate different meanings of Link ID

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

Type indicates the type of connection

19. Which of the following statements about the IS-IS protocol is false?

IS-IS protocol is a link state protocol that runs between ASs

IS-IS protocol supports CLNP network

IS-IS protocol packets are directly encapsulated by the data link layer

IS-IS protocol supports IP network

20. BGP authentication can prevent illegal routers from establishing neighbors with BGP routers. BGP authentication can be divided into MD5 authentication and Keychain authentication.

Which of the following BGP packets will carry BGP Keychain authentication information? (Multiple Choice)

Update

Notification

Keeplive

Open

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21. MPLS is called Multi-Protocol Label Switching, which is correct about the label description in MPLS? (Multiple Choice)

MPLS system has a variety of label distribution protocols, such as LDP is a label distribution protocol

The label is carried by the header of the MPLS packet and has global significance, that is, the label value of all routers cannot be repeated

The label is a fixed-length identifier with only local significance, which is used to uniquely identify the FEC to which a packet belongs

MPLS supports single-layer labels as well as multi-layer labels

22. In the process of establishing an LDP session, the active party will first send Initialization information to negotiate parameters. If the passive party does not accept the negotiated parameters, which of the following packets will be sent?

Hello Message

Error Notification Message

Keepalive Message

Initialization Message

23. Which of the following statements is correct when configuring source NAT with no-pat configuration parameters?

Perform destination IP address and destination port translation

Only perform source IP address translation

Only perform destination IP address translation

Simultaneous source IP address and source port translation

24. After an interface of the firewall is assigned to the Untrust security zone, the interface belongs to the Untrust zone and no longer belongs to the Local zone.

TRUE

FALSE

25. Which of the following options is correct about the optimal route election for various protocols?

Route entries with unreachable next hops in BGP are also put into the IP routing table.

In the BGP protocol, the optimal route to the same destination network segment is selected by comparing the cost value of the route entry.

The OSPF protocol will put all the routing information in the LSDB into the IP routing table.

Learn different route entries to the same destination network segment from BGP and OSPF, and select the optimal route to add to the IP routing table by comparing the preference value of the protocol.

26. In a VXLAN scenario, which features can be enabled to reduce the flooding of ARP packets between VTEPs? (Multiple Choice)

Host Information Collection

Local ARP proxy

Port isolation

ARP broadcast suppression

27. Which of the following statements about ISIS' route penetration is correct? (Multiple Choice)

ISIS routing penetration can be used in |Pv6 environment.

ISIS routing penetration can be deployed on Level-1 routers.

ISIS' route penetration does not include aggregated routes.

ISIS route penetration does not cause neighbor flapping.

ISIS route penetration is used to prevent routing loops.

28. Which of the following statements about the VRRP protocol is correct?

Both VRRPv2 and VRRPv3 support authentication

VRRPv3 does not support the authentication function, while VRRPv2 supports the authentication function

VRRPv2 is only applicable to IPv4 networks, VRRPv3 is only applicable to IPv6 networks

The owner's VRP priority of the Master IP address is 255, and all configurable priorities range from 0 to 254.

29. Regarding the MPLS processing mode for TTL, which of the following descriptions is correct?

In Pipe mode, when an IP packet passes through an MPLS network, at the ingress point, the IP TTL minus 1 is mapped to the MPLS TTL field

The TTL in the MPLS label has the same meaning as the TTL field in the IP header. TTL prevents routing loops in MPLS networks

In Unifor mode, when IP packets pass through the MPLS network, the IP TTL of the ingress point is decremented by 1. MPLS TTL field is a fixed value

In MPLS VPI, if you need to hide the structure of the MPLS backbone network, you can use the Uniform mode on the Ingress for private network packets.

30. In OSPFv3, a Router-LSA is generated for each router, which describes the interface address and cost of each router link, and includes the Router ID of the neighboring router.

True

False

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31. Which of the following advanced features does BGP EVPN support?

ARP broadcast suppression

VRRP over VXLAN

Multi-live gateway

VXLAN Qos

32. Which of the following statements about VXLAN messages is correct? (Multiple choice)

The outer destination IP address is the IP address of the remote VTEP of the VXLAN tunnel.

The source UDP port number is 4789

Destination UDP port number is 4789

VNI has 24 bits and is used to distinguish VLAN segments.

33. Which of the following types of packets is required to implement virtual machine migration in the BGP EVPN distributed gateway scenario?

Type3

Type5

Type4

Type2

Type1

34. Which of the following statements about the BFD single-arm echo function are correct? (Multiple Choice)

The BFD single-arm echo function must be configured with a local identifier and a remote identifier.

The default destination IP address of the BFD single-arm echo function protocol packet is 224.0.0.184.

BFD single-arm echo function is applicable to scenarios where one device supports BFD and the other device does not.

After the BFD single-arm echo function is enabled, the destination IP and source IP of the BFD packets are the same.

35. The following statements about the VRRP protocol which are correct?

Both VRRPv2 and VRRPv3 support authentication.

VRRPv3 does not support authentication, while VRRPv2 supports authentication.

VRRPv2 is only applicable to IPv4 networks, and VRRPv3 is only applicable to IPv6 networks.

The owner of the Mater IP address has VRRP priority of 255, so the priority range that can be configured is 0-254.

36. HW users are transmitting a lot of files through TFTP.

What protocol does TFTP rely on for transmission?

IcmP and UDP

iP and TCP

UDP

NFS

FTP

37. When deploying LLQ, you need to configure bandwidth parameters. What is the meaning of bandwidth parameters?

Provide a built-in policer to limit the maximum available bandwidth of low latency queues during congestion

This parameter should be as small as possible. It means that the bandwidth is always reserved, even if LLQ is used, this parameter will reduce the available bandwidth of the interface.

It indicates that the reference CR is used to calculate the burst size of the built-in policer token bucket.

This parameter is an option because LLQ always takes precedence over other queues

38. Assume that the port shaping rate is 100Mbps. The input bandwidth and PIR configured by IP of each service on the interface are as follows.

Then, after the first round of scheduling, what is the bandwidth allocated by the EF queue?

30M

15M

90M

25M

39. As shown in the figure, there are two IPv6 networks that can access the IPv4 network. At the same time, an IPSEC tunnel needs to be established between the two IPv6 networks for communication. Which of the following encapsulation modes can meet the requirements above?

ESP + tunnel mode

None of the above options

AH + transmission mode

AH + tunnel mode

40. Which of the following does the digital certificate not contain?

Public key information

Digital envelope

Digital signature

Issuer

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41. The LAND attack is performed by the attacker sending a source address and a destination address to the destination host are the destination host, the same SYN packet on source port and the destination port. When the receiver waits for the final ACK packet from the sender, the connection is always in a semi-connected state, resulting in waste of limited TCP resources at the receiving end.

True

False

42. The following statement about the security confederation SA in IPsec, which is wrong?

The SA is uniquely identified by a triplet that includes the Security Parameter Index (SP), the source IP address and the security protocol number used (AH or ESP).

Use display IPsec to view information about encryption algorithms, traffic, and other information used between another IPsec peer.

IPsec only supports the use of symmetric encryption algorithms to encrypt data.

There must be two-way SA between IPsec peers to establish an IPsec VPN connection.

43. Router HW1 and router HW2 are connected to network A and network B respectively. As shown below, if you want to establish an IPsec VPN between router HW1 and router HW2.

Which ACL does the router HW1 need to configure to enable LAN-to-LAN traffic to pass through the encrypted VPN tunnel?

rule permit ip source 192.168.1.10 destination 192.168.1.2 0

rule permit ip source 10.1.1.0 0.0.0.255 destination 192.168.1.2 0

rule permit ip source 10.1.1.0 0.0.0.255 destination 10.1.2.0 0.0.0.255

rule permit ip source 192.168.1.10 destination 10.1.2.0 0.0.0.255

rule permit ip source 10.1.2.0 0.0.0.255 destination 10.1.1.0 0.0.0.255

44. Which of the following options is correct for the assertion mechanism?

The size of the IP address will not be used as a condition for election during the election of the winner.

In the assertion mechanism, winner is responsible for forwarding multicast data to the broadcast network segment.

The assertion mechanism is used for the election of the D

In the assertion mechanism, loser shut down the interface connected to the broadcast network.

45. If there are multiple receivers in a multicast group, the administrator enables IGMP-Snooping on the switch connecting the receiver. After the receiver receives the general query message from the querier, the receiver receives multiple receivers. How to respond?

All recipients will respond to the Report message.

Only when IGMPv1 is running, all receivers respond to the Report message.

The first responder with a response timeout sends a Report message, and the other recipients do not send it.

Only the IGMPV2 is running, and all receivers respond to the Report message.

46. If running PIM-SM on a multicast network, you need to construct a multicast forwarding tree between the multicast source and the receiver to enable the receiver to receive multicast data. Which of the following description about the constructed multicast forwarding tree is correct? (Multiple Choice)

The RTP tree is built between the RP and the receiver.

The RPT tree is built between the multicast source and the R

The SPT tree is built between the RP and the receiver.

The SPT tree is built between the multicast source and the R

47. The following description of the BSR mechanism, which is correct? (Multiple Choice)

There can be multiple C-BSR in a PIM-SM domain, but only one BSR can be elected.

The BSR collects C-RP information through the received C-RP data packets.

The BSR advertises BSR information and C-RP information to all routers in the PIM-SM domain by flooding Bootstrap packets.

One C-BSR can also collect C-RP information through received C-RP packets.

48. The following are the statements about LDP reliability, which one is wrong?

LDP FRR can also be used to generate an LSP for the label mapping from the non-optimal next hop. And it can be as a backup of the primary LSP to establish the transfer entries.

The association between the LDP and the IGP requires the IGP to suppress the advertisement of the route and ensure that the LDP path is consistent with the IGP path.

The manually configured LDP FRR policy defaults to a 32-bit backup route that triggers LDP to establish a backup LS

LDP GR Graceful Restart uses the feature that the MPLS forwarding plane is separated from the control plane. The device does not interrupt when the protocol is restarted or the active/standby switchover is performed.

49. The following is about the LDP protocol session establishment process, which is the correct description? (Multiple choice)

After the TCP connection is successfully established, the active party sends an initialization message to negotiate the parameters related to the LDP session.

The party with the larger transmission address acts as the active party and initiates the establishment of TCP connection.

The Hello message discovered by the LDP neighbor uses TCP packets. The destination address is the multicast address 224.0.0.2.

After both parties receive the Keepalive message from the peer, the LDP session is established successfully.

50. RD is used to distinguish the same IP address in different VPNs. How many bits does the RD contain?

128

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51. The association between LDP and IGP refers to the suppression of the issuance of reachable routes through IGP. To ensure that the LDP and IGP linkages complete network convergence. Make the IGP and LDP keep the path consistent. Minimize the loss of traffic and improve the reliability of the entire network.

True

False

52. Regarding the processing mode of MPLS for TTL, which description is correct?

In Pipe mode, when an IP packet passes through the MPLS network, the IP TTL is decremented by 1 to the MPLS TTL field on the ingress node.

The TTL of the MPLS label has the same meaning as the TTL in the IP header, which can prevent the MPLS network from generating a routing loop

Uniform simulation, when the IP packet passes through the MPLS network, the IP TTL of the ingress node is decremented by 1, and the MPLS TTL field is a fixed value.

In MPLS VPN, if you want to hide the structure of the MPLS backbone network, you can use the uniform mode for Ingress packets for private network packets.

53. In an MPLS VPN network, different CE devices can exchange routing information with the same PE device using different routing protocols. The routing protocols used between different CE devices and the same device are independent of each other.

True

False

54. Which of the following technologies use tunneling technology to communicate between IPv6 addresses? (Multiple Choice)

Dual Stack

6to4

ISATAP

NAT64

55. If the router only needs to forward IPv6 packets, there is no need to configure any IPv4 protocols and addresses on the router.

Ture

False

56. The following procedure for NDP to resolve the link layer address is correct or not.

Ture

False

57. BGP 4+ runs between the two routers. The neighbor relationship is normal. However, the BGP routing table of the local router does not have neighbor's routing entry. What is the possible reason? (Multiple Choice)

The routing entries of the peer BGP routing table are non-optimal.

The next hop address of the BGP routing entry is unreachable.

Peer ignore configured on the peer

Active-route-advertise configured on the peer

58. Which of the following options may affect the establishment of IBGP neighbors? (Multiple Choice)

Authentication is unsuccessful

The BGP protocol version is inconsistent

IBGP-Multi-hop is not configured

IGP routing is unreachable

59. Which of the following tools cannot be directly referenced by the If-match clause in the Route-policy?

Regular expression

IP-prefix

AS-path-filter

Community-filt

60. Which of the following information can be included in a basic network layer packet? (Multiple choice)

Data link layer header

Upper layer data

Network layer header

Path record

Network layer tail

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61. Which of the following description about configuring BGP4+ is correct? (Multiple choice)

The BGP4+ router-ID is the same as the BGP4 router-I

BGP4+ must use the Link-Local address when specifying the peer

The next hop of the BGP4+ route does not use the Link-Local address.

When BGP4+ configures a reflector, the roles of the reflector and the client must be consistent with the configuration of BGP4.

BGP4+ does not support route reflectors.

62. The OSPF protocol is running on a company network. To understand the OSPF mechanism to perform packet capture operations on the network, which of the following description about the OSPF packet is correct? (Multiple Choice)

LS Update message synchronizes the link state database by sending detailed LSA information.

After receiving the LS Update message, the router must send LS Ack to confirm.

Sending Hello packets immediately after the interface joins the OSPF area.

The LS Update message is sent only when the adjacency is established.

63. Regarding the stub area in the OSPF protocol, the following statement which is correct? (Multiple Choice)

ASBR cannot exist in the stub area.

The virtual link cannot traverse the stub area.

stub area is not allowed to inject type7 LSA

The backbone area cannot be configured as a stub area.

64. Which type of LSA cannot in the OSPF stub area? (Multiple Choice)

Type-7

Type-5

Type-4

Type-3

65. An existing router running OSPF is connected to Zone 0 and Zone 1. You configure zone 1 as a stub area. What types of LSA are only operating inside Zone 1?

Type 7 LSA

Type 1 LSA and Type 2 LSA

Type 1 LSA, Type 2 LSA and Type 5 LSA

Type 3 LSA and Type 4 LSA

Type 1 LSA, Type 2 LSA and Type 3 LSA

66. An engineer performs an import operation on an OSPF router in a company network. The following statement about the introduction of a route LSA, which is correct? (Multiple Choice)

The Advertising Route is set to the router-id of the ASB

netmask is set to 0

link state id is set to the destination network segment address

Use link state id and advertising router to uniquely identify an LSA

67. Broadcast-type network, starting the election of DIS after the establishment of the neighbor relationship.

True

False

68. The following statements about the ISIS protocol route aggregation, which are correct?

Route aggregation can be configured and validated on all types of routers.

Route aggregation can only be configured on the level-1 router to take effect.

Route aggregation can only be configured on the level-2 router to take effect.

Route aggregation can only be configured on the level-1-2 router to take effect.

69. ISIS does not send CSNP packets under the P2P network type during the neighbor establishment process.

True

False

70. Router-LSA of OSPFv3 is generated by each router. It describes the interface address and cost of each link of the router, and also contains the router ID of the neighboring router.

True

False