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1. To speed up the detection of link failures in IS-IS networks, you can associate IS-IS with BFD.

TRUE

FALSE

2. In OSPF, ABR converts all Type 7 LSAs in the NSSA area to Type 5 LSAs.

TRUE

FALSE

3. Which of the following statements about IPSG is false?

IPSG can prevent IP address spoofing attacks

IPSG is a source IP address filtering technology based on Layer 3 connection

The IPSG can enable the IP packet inspection alarm function, and link the network management to alarm

IPSG can prevent the host from changing the IP address privately

4. The security protection actions that can be performed by a secure MAC address do not include which of the following?

Protect

Restrict

Shutdown

Remark

5. As shown in the figure, a campus has deployed IPv6 for service testing, and there are 4 routers in the network.

Run OSPFV3 to realize network interconnection.

Which of the following statements is false about the LSA generated by this OSPFv3 network?

R1 will generate the Router-LSA by itself to describe the device connection information, and it will also receive the Router-LSA generated by R2 and R3.

There are Network LSAs generated by R3 in the LSDB of R1

R1 will receive 2 Link-LSAs generated by R2

As an ABR, R2 will generate an Inter-Area-Prefix-LSA describing the IPv6 address prefix of Area1, and advertise it to R1 and R3

6. A router runs OSPF, and the output information is shown in the figure. Which of the following statements is correct?

The type of the LSA is AS-external-LSA

The destination network described by this LSA is 10.0.23.0/24

The LSA in the figure is generated by this router

This device is an ABR

7. All routers run OSPF as shown.

Which of the following statements is correct?

R2 generates Router LSAs in both area 1 and area 0

R2 forwards the Router LSA generated by R3 to R1

R2 forwards the Router LSA generated by R1 to R3

R2 only generates Router LSA in area 0

8. According to this figure, which statement is correct about the IPv6 routing information calculated by the R4 router through IS-IS?

R4 has 1 IS-IS default route

R4 has 2 IS-IS default routes of equal cost

R4 has 2 IS-IS default routes with unequal cost

R4 has no IS-IS routing entry

9. The routing attributes of the three routing entries are shown in the figure. It is assumed that the next hops of the three routing entries are reachable. When the three routing entries arrive at the BP router in sequence, which routing entry will BGP choose in the end by default?

Route B

Route C

Route A

10. As shown in the figure, Client1 and Client2 serve as clients of RR1 and RR2 at the same time. RR1 and RR2 are in the same Cluster, and R1 has entered 10 routes. It is assumed that BGP is configured correctly.

All neighbor relationships have been established. How many routing entries exist in the BGP routing table of Client2?

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11. Which of the following is not a hardware preparation for cutover?

Test the operation of the board

Power-on test

Device version check

Cable Continuity Test

12. Which of the following statements is false when troubleshooting the dual-active failure of the VRRP backup group?

There is no need to check whether the switch port that transmits VRRP advertisement packets is in the same VLAN

Need to check whether the VRRP group IDs on the interface are the same

Need to check whether the interface IP address is in the same network segment

Need to check whether the virtual IP addresses of the VRRP group are the same

13. When troubleshooting the EBGP neighbor relationship, you find that the two directly connected devices use the loopback port to establish a connection, so execute display current-configuration configuration bgp to check the configuration of peer ebgp-max-hophop-count. Which of the following statements is correct?

hop-count/ must be greater than 2

hop-count must be greater than 15

hop-county must be greater than 1

hop-count must be greater than 255

14. When a fault occurs, the fault can be classified to reduce the scope of fault location. Which of the following is not an interface configuration fault?

The duplex modes of the interfaces at both ends are inconsistent

IP address conflict

Inconsistent interface authentication

Inconsistent luminous power received at both ends

15. If you want to check the files under Flash, which command should you use?

dir sdl

dir sd0

display patch-information

dir flash

16. As shown in the figure, the APLS LSP is configured in the network and the goal is to establish an LDP session between SWA and SWB, then which of the following statement is correct?

A. Configured correctly

B. No need to enable MPLS globally

C. No need to enable MPLS on the port

D. The mpls lsr-id of the two devices cannot be configured in the same way

17. As shown in the figure, OSPF is enabled on all interfaces of the router, and the cost value of the link is marked in the figure. The Loopback0 interface of R2 is advertised in area 1, then the Cost value of R1 reaching 10.0.2.2/32 is:

200

150

100

18. As shown in the figure, OSPF is enabled on all interfaces of the router. The ip address marked in the figure is the IP address of the loopback0 interface. The Loopback0 of R1, R2, and R3 is advertised in area 1, and the Loopback0 of R4 is advertised in area 0, Loopback0 of R5 announces which of the following functional addresses in area 2 can ping each other?

10.0.3.3 and 10.0.5.5

10.0.4.4 and 10.0.2.2

10.0.2.2 and 10.0.3.3

10.0.2.2 and 10.0.5.5

19. According to this picture, we can judge:

The system ID of R1 is ee8c.a0c2.baf1

R1 has both level1-1 and level-1-2 dimension information

R1 only has link status information of level1-2

In the leve1-2 network, there are a total of 8 routers

20. In the network shown in the figure below, if a remote LDP session between SWA and SWC is to be realized, which of the following statement is correct?

It is not necessary to specify the lsr-id of the correct peer

The configuration in the figure can already be implemented

You need to create a remote peer and specify the lsr-id of the peer

Need to configure the direct connection interface to establish a TCP connection

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21. As shown in the figure, MPLS/BGP IPVPN is deployed in the network, and the MP-BGP neighbor relationship is established between PE1 and PE2 through the Loopback0 interface. After the configuration is complete, it is found that CE1 and CE2 cannot learn routes from each other. Use the command on PE2 Looking at the neighbor information as shown, what is the most likely cause of the problem?

The VPN instance parameters on PE1 or PE2 are incorrectly configured

PE1 and PE2 do not have bell neighbors enabled in the BGP-VPN4 unicast address family view

The LSP tunnel between PE1 and PE2 is not established

Misconfiguration of routing protocols between PE1 or PE2 and their respective CEs

22. According to this figure, we can judge:

R1 is configured with zone authentication

The device type of R1 is Level-1

The device type of R1 is Leve-2

R1 sets routing domain authentication

23. According to this picture, we can judge:

The device type of R3 must be Level-1-2

Unable to determine the device type of R3

The device type of R3 must be Level-1

The device type of R3 must be Level-2

24. The IS-IS neighbor relationship between R3 and R1 is not established. According to the information in this figure, what is the possible reason?

The IIH authentication of R3 and R1 failed

The System IDs of R3 and R1 are duplicated

The lS-Level of R3 and R1 do not match

The circuit-type of the interconnection interface of R3 and R1 does not match

25. Network administrator A wants to use ACL to match only the four routing entries 1, 3.5, and 7 in the figure. How many ACL rules does network administrator A need to configure at least?

26. As shown in the figure, an engineer uses 4 routers to test branch network interoperability. Among them, R1, R2, and R3 in branch 1 deploy OSPF to realize network interoperability. R2, R3, and R4 in branch 2 deploy IS-IS to realize network intercommunication.

Now the engineer wants to implement R1 to access the loopback interface address of R4. Which of the following operations can meet this requirement?

In the OSFF process and the IS-IS process of R2, the default route is advertised respectively

No configuration required

Advertise the default route only in the IS-IS process of R2

Advertise the default route only in the OSPF process of R2

27. According to this figure, it can be known that in VLAN 300, on 2020-06-04, from 17:22:38 to 17:22:44, how many MAC flaps does the 00e0-fc3d-3bdb have?

65535

300

28. According to this figure, we can judge:

R4 does not have any IS-IS neighbors

R4 and ee8c.a0c2.baf3 establish IPv4 and IPv6 IS-IS neighbors

R4 and ee8c.a0e2.baf3 only establish an IPv6 IS-IS neighbor

R4 and ee8c.a0c2.baf3 only establish an IPv4 IS-IS neighbor

29. As shown in the figure, OSPF is enabled on all interfaces of the router. Which of the following statements is correct?

The Type1 LSA generated by R2 in area 0 contains the routing information of 10.0.2.2/32

The Type5 LSA generated by R2 in area 0 contains the routing information of 10.0.2.2/32

The Type2 LSA generated by R2 in area 0 contains the routing information of 10.0.2.2/24

The Type3 LSA generated by R2 in area 0 contains the routing information of 10.0.2.2/32

30. An engineer uses two routers to test IPV6 services, and simulates the interconnection between the headquarters and branches by running BGP4+.

The logical topology of the network is shown in the figure. Regarding the transmission of IPv6 routes between the two-way devices, which of the following statements is false?

When routing is delivered, the Next Hop attribute must be an IPv6 global unicast address

BGP4+ transmits routing information between peers through Update packets

If the Update packet carries the AP REACH NLRI attribute, it means that the advertisement is a reachable route

Route transmission will carry recognized mandatory attributes such as AS Path

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31. As shown in the figure, Site1 and Site2 need to achieve mutual access through the operator's BGP/MPLS IPVPN. It is known that the public network tunnel between PE1 and PE2 has been established (the label information is shown in the figure), and PE1 has advertised the route of network segment 192.168.1.0/24 in Site1 to PE2 through the MPLS BGP neighbor relationship, and the route learning is normal.

When grabbing between P and PE1, when Site2 accesses the 192.168.1.0/24 data of Site1, what should be the outermost label?

6661

6662

8888

32. Part of the configuration of R1 is as follows. Which statement about OSPF on R1 is correct?

The device type of R1 is Leve-2

The device type of R1 cannot be determined

The device type of R1 is Level-1

The device type of R1 is Level-1-2

33. Which is wrong with this configuration description?

If there is no SubOption information of Option82 in the DHCP request packet received by GigabitEthemnet0/0/1 interface, the device will generate Option82

Enabling DHCP Snooping configuration can be used to prevent DHCP Server bogus attacks

Configure the GigabitEthernet0/0/1 interface as a trusted interface

Enable DHCP Snooping configuration can be used to prevent ARP spoofing attacks

34. Assuming that the neighbor relationship between BGP routers has been established successfully, the configuration on R1 is as shown in the figure.

Which router can the routing entry 10.10.10.0/24 published by 1 be delivered to the farthest?

35. According to the configuration shown in the figure below, you can know that R4 has an interface advertised into IS-IS?

36. A campus deploys OSPF to achieve network interoperability. An engineer configures R2 as shown in the figure. Which of the following description of LSAs in the OSPF network is wrong?

[R2] acl 2000

[R2-acl-basic-2000] rule deny

[R2-acl-basic-2000] quit

#

[R2] ospf

[R2-ospf-1] area 1

[R2-ospf-1-area-0.0.0.1] filter 2000 import

[R2-ospf-1-area-0.0.0.1] quit

[R2-ospf-1] default-route-advertise always

There is Type5 LSA flooding in Area2

There is no Type3 LSA flooding in Area2

There is Type5 LSA flooding in Area1

There is no Type3 LSA flooding in Area1

37. As shown below:

The IS-Leve1 of R3 and R1 do not match

The area numbers of R3 and R1 are different

The IIH authentication of R3 and R1 failed

The System IDs of R3 and R1 are duplicated

38. OSPFV2 is an IGP running on an IPV4 network; OSPFv3 is an IGP running on an IPV6 network. The basic working mechanism of OSPFv3 is the same as that of OSPFv2, such as the election of DR and BDR.

As shown in the figure, an engineer uses three routers to test IPv6 services. He wants to realize the interconnection of IPv6 networks by running OSPFv3.

Which of the following statements about the election of the network DR is correct?

After the network converges, the engineer changes the priority of R1 to 100, the priority of R2 to 10, and the default value of R3. When the network converges again, R1 is the DR

After the network converges, a new device R4 is added to the broadcast link

After the network converges, R1 is powered off and restarted, and when the network converges again, R3 is the DR

After the network converges, R1 is the DR

39. As shown in the figure, OSPF is enabled on all interfaces of the router, and the cost value of the link is advertised in area 0 according to the Loogback0 of R2 as shown in the figure, then in area 1, both R2 and R3 will transmit 10.0 in the form of Typae3 LSA .2.2/32 routing information.

TRUE

FALSE

40. An enterprise purchased private lines from two operators. In order to optimize the lines, the enterprise used BGP to learn routing entries from the two operators. However, the enterprise found that the traffic of the egress route increased greatly after this configuration. After the network engineering investigation, it was found that the traffic of the two operators was passed to each other through the enterprise egress router.

Therefore, the enterprise intends to use the routing strategy so that the traffic of the packets of different carriers is no longer passed to each other. Is the configuration in the following figure correct?

TRUE

FALSE

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41. In order to speed up the perception of link failures in the IS-IS network, IS-IS can be linked with BFD.

TRUE

FALSE

42. In OSPF, ABR will convert all Type 7 LSAs in the NSSA area into Type 5 LSAs.

TRUE

FALSE

43. Regarding the IPSG, which of the following statement is incorrect?

IPSG can prevent IP address spoofing attacks

IPSG is a source IP address filtering technology based on the three-layer interface

IPSG can turn on the IP packet inspection and alarm function, and cooperate with the network management to perform alarms

IPSG can prevent the host from changing the IP address privately

44. Which of the following are not included in the security protection actions that a secure MAC address can perform?

Protect

Restrict

Shutdown

Remark

45. An engineer uses two routers to test IPv6 services, and simulates the interconnection between the headquarters and branches by running BGP4+. As shown in the figure, an engineer captures the packet to view the update message sent by R1.

Regarding the description of the message information, which of the following statements is correct?

The next-hop address of the route described in this message is: 2001:db8::2345:1.:1

The message describes the currently revoked IPv6 route

The routing address prefix and its prefix length described in this message are: 2001:db8:2345:1::1/128/

The route described in the message may be imported through import

46. As shown in the figure, a certain park has deployed IPv6 for service testing, and there are 4 routers in the network. Run OSPFv3 to realize network interconnection.

Regarding the LSA generated by the OSPFv3 network, which of the following statements is wrong?

R1 itself will generate Router-LSA to describe device interface information, and will receive Router-LSA generated by R2 and R3 at the same time

There is a Network LSA generated by R3 in the LSDB of R1, indicating that R3 may be the DR of this link

R1 will receive the two Link-LSAs generated by R2, describing the two links information connected to R2 respectively

As an ABR, R2 will generate Inter-Area-Prefix-LSA describing the IPv6 address prefix of Area 1, and advertise it to R1 and R3

47. A network engineer outputs the following information when troubleshooting OSPF. Based on this, determine which reason causes the adjacency relationship to fail to be established normally?

Authentication password is not-consistent

Regional type is not-consistent

The interval for sending Hello messages is not-consistent

The IP address mask of the interface is not-consistent

48. A router is running OSPF, and the output information is as shown in the figure. Which of the following statements is correct?

The type of the LSA is AS-externa1-LSA

The destination network described by this LSA is 10.0.23.0/24

The LSA in the figure is generated by this router

This device is ABR

49. When there are multiple redundant links in the IS-S network, multiple equal-cost routes may appear.

Regarding equal-cost routes in an IS-IS network, which of the following descriptions is wrong?

When the number of equal-cost routes in the networking is greater than the number configured through commands, and the priorities of these routes are the same, the route with the higher System ID of the next hop device is preferred for load sharing

If negative arbitration sharing is configured, the traffic will be evenly distributed to each link

After the equal-cost routing priority is configured, when the IS-IS device forwards the traffic that reaches the destination network segment, it will not adopt the load sharing method, but will forward the traffic to the next-hop with the highest priority.

For each route in the equal-cost route, the priority can be specified, and the route with the higher priority will be preferred. The rest are used as backup routes

50. As shown in the figure, all routers run OSPF.

Which of the following statements is correct?

R2 generates Router LSA in both area 1 and area 0

R2 forwards the Router LSA generated by R3 to R1

R2 forwards the Router LSA generated by R1 to R3

R2 only generates Router LSA in area 0

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51. What is the value of OSPF and BFD linkage?

The hello sending interval of OSPF is at the second level, which is faster than BFD inductive link state

The sending interval of BFD packets can reach the millisecond level, which is slower than the OSPF inductive link state

Through the BFD detected at the millisecond level, the OSPF status is associated to achieve the purpose of OSPF quickly inductive link state

Any change in the BFD status will not affect the OSPF neighbor status

52. According to this figure, which of the following is the correct description of the IPv6 routing information calculated by the R4 router through IS-IS?

R4 has 1 IS-IS default route

R4 has 2 equal-cost IS-IS default routes

R4 has 2 unequal IS-IS default routes

R4 has no IS-IS routing entry

53. The routing attributes of the three routing entries are shown in the figure. Assuming that the next hop of the three routing entries are all reachable, when the three routing entries arrive at the BP router in sequence, by default, BGP will finally select one route entry?

Route B

Route C

Route A

54. As shown in the figure, Client1 and Client2 act as clients of RR1 and RR2 at the same time, RR1 and RR2 are in the same Cluster, and R has introduced 10 routes. Assume that the BCP configuration is correct.

The neighbor relationship has been established. How many routing entries are there in the BGP routing table of Client2 ultimately?

55. Which of the following is not a hardware preparation item for cutover?

Test the operation of the board

Power-on test

Device version check

Cable connectivity test

56. When troubleshooting dual-master faults in a VRRP backup group, which of the following statements is wrong?

There is no need to check whether the switch port that transmits the VRRP advertisement message is in the same VLAN

Need to check whether the VRRP group ID on the interface is the same

Need to check whether the interface IP address is in the same network segment

Need to check whether the virtual IP addresses of the VRRP group are the same

57. When troubleshooting the EBGP neighbor relationship, you found that two directly connected devices use Loopback ports to establish a connection, so execute display current-configuration configuration bgp to view the configuration of peer ebgp-max-hop hop-count. Which of the following statements is correct?

hop-count must be greater than 2

hop-count must be greater than 15

hop-count must be greater than 1

hop-count must be greater than 255

58. When a fault occurs, the fault can be classified to reduce the scope of fault location. Which of the following is not an interface configuration fault?

The duplex modes of the interfaces on both ends are inconsistent

IP address conflict

Inconsistent interface authentication

The receiving and emitting power of both ends is inconsistent

59. If you want to check files under Flash, which command should use?

dir sdl:

dir sd0:

display patch-information

dir flash:

60. As shown in the figure, MPLS LSP is configured in the network, and the goal is to establish an LDP session between SWA and SWB, then which of the following statement is correct?

The configuration is correct

No need to enable MPLS globally

No need to enable MPLS on the port

Two devices mpls lsr-id cannot be configured as the same

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61. As shown in the figure, the cost value of the link that all interfaces of the router enable DSPF is identified in the figure.

The Loopback D interface of R2 is advertised in area 1. Then the cost value of R1 to 10.2/32 is:

200

150

100

62. As shown in the figure, all interfaces of the router enable OSPF. The ip address identified in the figure is the IP address of the device's Loopback 0 port. R1, R2, R3EJLoopbacD are advertised in area 1, and Loopbacfk D of R4 is advertised in area D, the Loopback D of R5 is advertised in area 2. Which of the following addresses can ping each other?

10.0.3.3 and 10.0.5.5

10.0.4.4 and 10.0.2.2

10.0.2.2 and 10.0.3.3

10.0.2.2 and 10.0.5.5

63. According to this picture, we can judge:

The system ID of R1 is ee8c.a0c2.bafl

R1 has both leve1-1 and level-1-2 link state information

R1 only has link state information for leve1-2

In the leve1-2 network, there are a total of 8 routers

64. In the network shown in the figure below, if you want to implement a remote LDP session between SWA and SWC, which statement is correct?

No need to specify the lsr-id of the correct equivalent

The configuration in the figure can be achieved

Need to create a remote peer, and then specify the lsr-id of the peer

Need to be equipped with a straight connection port to establish a TCP connection

65. As shown in the figure, MPLS/BGP IPVPN is deployed in the network. The MP-BGP neighbor relationship is established between PE1 and PE2 through the LoopbackD interface. After the configuration is completed, it is found that CE1 and CE2 cannot learn routes from each other. Use the command on PE2 to query neighbor information as shown in the figure. What is the most likely cause of the problem?

The VPN instance parameters on PE1 or PE2 are incorrectly configured

PE1 and PE2 are not enabled with neighbors in the BGP-VPN4 unicast address family view

The LSP tunnel between PE1 and PE2 is not established

The routing protocol configuration between PE1 or PE2 and the respective CE is incorrect

66. According to this picture, we can judge:

R1 is configured with regional authentication

The device type of R1 is Level-1

The device type of R1 is Level-2

R1 has configured the routing domain authentication

67. According to this picture, we can judge:

The device type of R3 must be Level-1-2

Unable to determine the device type of R3

The device type of R3 must be Level-1

The device type of R3 must be Level-2

68. The IS-IS neighbor between R3 and R1 is not established. According to the information in this figure, what is the possible cause?

The IIH certification of R3 and R1 failed

The System ID of R3 and R1 are duplicated

The lS-Level of R3 and R1 do not match

The circuit-type of the interconnection interface between R3 and R1 does not match

69. The network administrator A wants to use ACL to match only the four routing entries 1, 3.5, and 7 in the figure. How many ACL rules does the network administrator A need to configure at least?

70. As shown in the figure, an engineer uses 4 routers to test branch network interoperability. Among them, R1, R2, and R3 in branch 1 deploy OSPF to achieve network interoperability. R2, R3, and R4 in branch 2 deploy IS-S to achieve network interoperability.

Now the engineer wants to realize the loopback address of R1 to R4. Which of the following operations can meet this requirement?

In the OSFF process and the IS-IS process of R2, respectively advertise the default route

No configuration is required

Advertise the default route only in the IS-IS process of R2

Advertise the default route only in the OSPF process of R2

Page 8 of 12

71. According to this figure, it can be known that in VLAN300, 0 MAC drift occurred by 00e0-fc3d-3bdb from 17:22:38 to 17:22.44 on 2020-06-04.

65535

300

72. According to this picture, we can judge:

R4 does not have any IS-IS neighbors

R4 and ee8c.aOc2.baf3 have established IPv4 and IPv6 IS-IS neighbors

R4 and ee8c.aOe2.baf3 only established IPv6 IS-IS neighbors

R4 and ee8c.aOc2.bat3 only established IPv4 IS-IS neighbors

73. As shown in the figure, all interfaces of the router enable OSPF. Which of the following statements is correct?

The Type1 LSA generated by R2 in area 0 contains 10.0.2.2/32 routing information

The Type5 LSA generated by R2 in area 0 contains 10.0.2.2/32 routing information

The Type2 LSA generated by R2 in area 0 contains 10.0.2.2/24 routing information

The Type3 LSA generated by R2 in area 0 contains 10.0.2.2/32 routing information

74. An engineer used two routers to test IPv6 services, and simulated the interconnection between headquarters and branches by running BGP4+.

The logical topology of the network is shown in the figure. Regarding the transmission of IPv6 routes between two devices, which of the following statements is wrong?

When routing, the Next_Hop attribute must be an IPv6 global unicast address

BGP4+ transmits routing information between peers through Update messages

If the Update message carries the MP_REACH_NLRI attribute, it means that the advertised route is reachable

When routing, it will carry AS_Path and other recognized mandatory attributes

75. As shown in the figure, Site1 and Site2 need to achieve mutual access through the operator's BGP/MPLS IPVPN. It is known that the public network tunnel between PE1 and PE2 has been established (the label information is shown in the figure), and PF1 has advertised the 192.168.1.0/24 network segment route in Site1 to PE2 through the MP.JIBGP neighbor relationship, and the route learning is normal.

When capturing the data that Site2 visits the 192.168.1.0/24 of Site1 between P and PE1, what should be the outermost label?

6661

6662

8888

76. Part of the configuration of R1 is as follows. Which statement about OSPF on R1 is correct?

The device type of R1 is Level-2

The device type of R1 cannot be determined

The device type of R1 is Leve1-1

The device type of R1 is Level-1-2

77. Which of the following regarding the configuration description is wrong?

If the DHCP request message received by the GigabitEthemnet0/0/1 interface does not contain the SutOption information of Option82, the device will generate Option82 and insert it into the message

Enabling the DHCP Snooping configuration can be used to prevent DHCP Server counterfeiters from attacking

Configure GigabitEthernet0/0/1 as a trusted interface

Enabling the DHCP Snooping configuration can be used to prevent ARP spoofing attacks

78. Assuming that the neighbor relationship between BGP routers has been established successfully, the configuration on R1 is as shown in the figure.

Which router can the route entry 10.10.10.0/24 advertised by R1 be delivered to?

79. According to the configuration shown in the figure below, you can know that how many interfaces of R4 are advertised into IS-IS?

80. As shown in the figure:

The LSA in the figure is generated by this router

The destination network described by this LSA is 10.0.23.0/24

The type of the LSA is AS-exterma1-LSA

This device is ABR

Page 9 of 12

81. As shown in the figure:

There is Type 5 LSA flooding in Area2

There is no Type 3 LSA flooding in Area2

There is Type 5 LSA flooding in Area1

There is no Type3 LSA flooding in Area1

82. As shown in the figure:

IS-Leve1 of R3 and R1 do not match

R3 and R1 have different area codes

The IIH certification of R3 and R1 failed

The System ID of R3 and R1 are duplicated

83. OSPFv2 is an IGP running on an IPv4 network; OSPFv3 is an IGP running on an IPv6 network. The basic working mechanism of OSPFv3 is the same as OSPFv2, such as the election of DR and BDR. As shown in the figure, an engineer uses three routers to test IPv6 services. He wants to realize the interconnection and interoperability of IPv6 networks by running OSPFv3.

Which of the following statements regarding the election of DR on this network is correct?

After the network converges, the engineer changes the priority of R1 to 100, the priority of R2 to 10, and the default value of R3. When the network converges again, R1 is DR and R2 is BDR

After the network converges, a new device R4 is added to the broadcast link, and the priority of R4 is 150. When the network converges again, R4 is the DR

After the network converges, R1 is powered off and restarted. When the network converges again, R3 is the DR

After the network converges, R1 is the DR

84. As shown in the figure, the cost value of the link that all interfaces of the router enable OSPF is identified in the figure. Loogback0 interfect of R2 is advertised in area 0. In area 1, both R2 and R3 will be transmitted in the form of Typae3 LSA 10.0.2.2/32 routing information.

TRUE

FALSE

85. An enterprise purchased the leased lines of two operators. In order to optimize the route, the enterprise used the 6GP protocol to learn routing entries of the two operators. However, the company found that after such a configuration, the traffic of the export routing increased greatly. After the network engineering investigation, it was found that the traffic of the two operators was passed to each other through the company's export router.

Therefore, the company intends to use routing strategies to prevent the traffic between different operators from passing each other. Is the configuration in the figure correct?

TRUE

FALSE

86. As shown in the figure, the carrier BGP/MPLS IP VPN backbone network constructs SP through DP. If you want to realize the intercommunication between the two sites of user X through the BGP/MPLS IPVPN network, the 32bit mask of Loopback interface address must be used between PE1 and PE2 to establish the MP-IBGP peer relationship.

TRUE

FALSE

87. As shown in the figure, all interfaces of the router enable OSPF, among which R4 and R5 can establish OSPF virtual connections.

TRUE

FALSE

88. As shown in the figure, OSPF is deployed in a campus, and Area 1 is deployed as an NSSA area. By default, R2 will automatically generate a Type 7 LSA default route and flood it in the NSSA area.

TRUE

FALSE

89. As shown in the figure, network administrator A on the R1 router, after modifying the Local Preference value of the routing entry sent to R2 through the routing policy, can control the path of traffic leaving AS100.

TRUE

FALSE

90. As shown in the figure, all routers run OSPF, because R3 is in the backbone area, so there is no type 3 LSA in the LSDB of R3.

TRUE

FALSE

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91. As shown in the figure, network administrator A on the R1 router, after modifying the MED value of the routing entry sent to R2 through the routing policy, can control the path of traffic entering AS100.

TRUE

FALSE

92. The OSPF protocol runs between CE and PE, when CE1 advertises the route of the site to CE2. Which of the following description is wrong?

When PE2 receives a BGP route from PE1 that carries a different Domain ID from the local one, it is correct for all LSAs, and PE2 will generate Type5 LSA or Type7 LSA

When PE2 receives the same Domain ID as the local BGP route sent by PE1, PE2 will generate Type3 LSA for Type1 LSA and Type2 LSA

When PE2 receives the same Domain ID as the local BGP route sent by PE1, for Type3 LSA, PE2 will generate Type5 LSA

The Domain ID configured by PE1 can be used as an extended community attribute of BGP and sent along with the route to PE2.

93. In the LDP session establishment process, the active party will first send the lnitialization information for parameter negotiation, and if the passive party does not accept the negotiation parameters, it will send _____ .

Keepalive Message

Initialization Message

Hello Message

Error Notification Message

94. Regarding MP-BGP, whici of the following description is incorrect?

When the PE and CE exchange routes through BGP, you need to create a BGP process for each VPN instance on the CE

MP-BGP's message type and VPNv4 routing policy are the same as BGP-4

MP-BGP needs to assign private network labels to VPNv4 routes

MP-BGP advertises VPNv4 routes through two attributes: MP_REACH_NLRI and MP_UREACH_NLRI

95. By default, which of the following secure MAC address types will be lost after the device restarts?

Black hole MAC address

Sticky MAC address

Secure dynamic MAC address

Secure static MAC address

96. What is the command to adjust the link cost value of an IS-IS interface?

isis cost

isis timer hello

isis circuit-level

isis circuit-type

97. What is the purpose of configuring LSP fragmentation for IS-IS equipment?

Make the device unable to establish IS-IS neighbors

Allow the device to support more IS-IS routing entries

Make the device unable to learn IS-IS routing information

No practical purpose

98. A router LSA is shown in the figure. Which of the following statement is wrong?

The Router ID of this router is 10.0.12.1

This router is DR

The router has established adjacency

This router supports the import of external routes

99. Regarding the cause of the dual-master failure of the VRRP backup group, which of the following is the most unlikely?

The link that transmits the VRRP notification message is faulty

The low-priority VRRP backup group discards the received VRRP notification packets as illegal packets

The VRRP backup group IDs on both ends are different

Master device sends 1 notification message per second

100. Which of the following is not part of the preliminary preparations for the cutover plan?

On-site defense

Cutover target

Introduction to the current network

Risk assessment

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101. During the process of viewing the debug output through the SSH terminal, a lot of information pops up. Which of the following operations can make the Moni tor terminal no longer pop up the debug message? (Multiple Choice)

Exit the current Moni tor interface, log in to the device again using SSH to open the new Monitor interface

Open the notepad, enter undo debugging all, copy the command line, and paste it into the Monitor interface

Open the notepad, enter undo terminal monitor, copy the command line, and paste it into the monitor interface

Open the notepad, enter undo terminal debugging, copy the command line, and paste it into the Monitor interface

102. R1 executes the operation ping -a 10.1.1.1 10.5.16.2, what does this command mean?

The source IP address of the ping packet is any directly connected port address of R1

The source IFP address of the ping packet is the outgoing interface address of the optimal IP route that R1 points to 10.5.16.2, and is not 10.1.1.1

The source IP address of the ping packet is 10.1.1.1

The destination IP address of the ping packet is 10.1.1.1 and 10.5.16.2

103. Regarding the role of ping and tracert, which of the following statements is correct?

Ping detects the two-way reachability between the correct end and the one-way icmp echo request packet

Tracert must be able to trace every hop IP address from source to destination

Ping verifies the reachability from the local end to the opposite end, it does not mean that the opposite end is reachable from the local end

Tracert has the same function as ping, but the name is different

104. In the intra-domain MPLS VPN network, when the data packet enters the public network and is forwarded, it will be encapsulated with two layers of MPLS labels. Regarding the description of the two layers of labels, which of the following options is wrong?

The outer label of MPLS VPN is allocated by the LDP protocol or statically, and the inner label is allocated by the MP-BGP neighbor at the correct end.

The outer label of MPLS VPNE is called the private network label, and the inner label is called the public network label.

By default, the outer label is singled out before the packet is forwarded to the last hop device

The outer label is used to correctly send the data packet to the corresponding VPN on the PE device

105. Which of the following commands can be used to view BGP VPNv4 routing and BGP private network routing information on the PE?

display bgp routing-table address-family vpnv4

display bgp vpnv4 routing-table

display bgp routing-table ipv4-family vpnv4

display vpnv4 bgp routing-table

106. Regarding BGP/MPLS IPVPN data forwarding, which of the following descriptions is wrong?

When data is transmitted on the BCP/MPLS IPVPN backbone network, it always carries two layers of labels

The inner label during data forwarding is assigned by MP-BGP

The outer label during data forwarding can be allocated by LDP

The data sent by the PE to the CE is an IPv4 packet

107. Regarding BGP/MPLS IPVPN routing interaction, which of the following descriptions is wrong?

The egress PE can send IPv4 routes to the remote CE through BGP, IGP or static routing

After the egress PE receives the VPNv4 route advertised by the ingress PE, it filters the VPNv4 route according to the RT attribute carried by the route

The exchange between PE and CE is IPv4 routing information

The ingress PE changes the IPv4 route received from CE to VPNv4 route, and saves it according to different VPN instances

108. Which of the following descriptions is wrong?

The LSP established by statically assigning labels can also be dynamically adjusted according to network topology changes without the intervention of the administrator

The principle to be followed for manual label allocation is: the value of the outgoing label of the upstream node is the value of the incoming label of the downstream node

LSP is divided into static LSP and dynamic LS

The static LSP is manually configured by the administrator, and the dynamic LSP is dynamically established using the label protocol

Dynamic LSP is dynamically established through label distribution protocols, such as MP-BGP, RSVP-TE, LDP

109. MPLS has the concept of FEC forwarding equivalence class, so FEC cannot be allocated based on which of the following standards?

Class of Service

Fragment of fiset

Application Protocol

Destination Addess

110. What is the flooding scope in OSPFv3 for the LSA in the entire autonomous system?

Link-LSA

As-external-LSA

Inter-Area-Prefix-LSA

Intra-Area-Prefix-LSA

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111. What is the flooding scope in OSPFv3 for the LSA in the entire autonomous system?

Link-LSA

As-external-LSA

Inter-Area-Prefix-LSA

Intra-Area-Prefix-LSA

112. When troubleshooting MSTP, you executed the display current-configuration command to obtain the configuration file of the device. Which of the following statements is wrong?

No matter whether the BPDU Tunnel is configured on the device or not, MSTP will not affect it correctly

Whether the MSTP port connected to the user terminal device is disabled or configured as an edge port

Check the port configuration to confirm whether the MSTP-enabled port is enabled with the protocol message sending command. Such as: bpdu enable

Check whether the port is added to the correct WLAN

113. If the display current-configuration can reach the IS-IS configuration, but there is no IS-IS configuration in the display saved-configuration, what does it mean?

The IS-IS configuration that the Flash is running is not saved to the memory

The running IS-IS configuration in the memory has been saved to the Flash

No IS-IS command is entered

The running IS-IS configuration of the memory is not saved to the Flash

114. Compared with the OSPFv2 message header, what fields are added in the OSPFv3 message header?

IPV6 Auth Type

Link ID

Instance ID

IPV6 Router ID

115. What is the default aging time of the MAC address table of Huawei switches in seconds?

300

500

400

116. Which of the following is wrong about DHCP Snooping?

DHCP Snooping can prevent illegal attacks by setting trusted ports (all interfaces are untrusted by default)

Enable DHCP Snooping globally, without any post parameters, the device only processes DHCPv4 messages by default

Enable the DHCP Snooping function in the interface view, then all the DHCP message command functions under the interface will take effect

Enable the DHCP Snooping function in the VLAN view, and the command function of DHCP messages belonging to the VLAN received by all interfaces of the device will take effect

117. What is the most effective way to view device alarms through CLI?

display interface brief

display c1ock

display alarm

display current-configuration

118. Regarding the site in the BGPIMPLS IP VPN network architecture. Which of the following descriptions is correct?

In any case, different sites belonging to the same VPN cannot use overlapping address spaces

Terminals connected to the operator's network through the same CE may belong to different sites (MCE)

A site is a group of IP systems, and a network formed by a host cannot be called a site

The two networks separated by geographical locations must belong to different sites

119. If you are faced with a complex network failure, and after evaluation, it is considered that the troubleshooting cannot be completed in a short time, and at this time the user urgently needs to restore the availability of the network, then which is the correct approach?

Tell users that this is impossible

Directly build an alternative network environment without notifying the customer

Always try to troubleshoot, and do not inform users of the current difficulty of troubleshooting

Communicate with users whether it is possible to skip the faulty node and build an alternative network environment

120. In an operator's MPLSVPN network, there are two devices, PE1 and PE2, for MPLSVPN data forwarding. PE1 receives a 172.16.1.0/24 private network route from the client, and transforms it into a VPNv4 route on PE1 and assigns labels. Released to PE2 as 1027. The outgoing label of the MPLSLSR-ID from PE2 to PE1 is 1025.

When the client on PE2 accesses 172.16.1.0/24, the inner and outer labels of the frame sent by PE2 should be the combination of the following options?

Outer label: 1025, inner label: 1027

Outer label: 1027, inner label: 1027

Outer label: 1027, inner label: 1025

Outer label: 1025, inner label: 1025