Question 1

Regarding the sham link, which of the following descriptions is wrong?

Options :

A : sham linkThe coat is twoVPNlinks between instances, eachVPNThere must be one in the instancesham linkthe endpoint address, it must bePEon the routerVPNone in the address space has32bitmaskedLoopbackinterface address

B : becauseVPNflow is throughMPLSBackbone forwarding,sham linkThe routing cost should be less thanbackdoorroadOSPFrouting cost

C : sham linkThe endpoint address of theBGPasVPhv4address published. passedsamlikThe route can also be reconfigured withVPNv4The form of routing is introduced toBGP

D : Sham linkIt can be configured in any area and needs to be manually configured and the local endVPNThe instance must have tosham linkdestination address (peerPEofsham linkendpoint address) routing

Answer: C

Question 2

About the difference between NSR and NSF, which is correct?

Options :

A : NSFCan be done without neighbor routers

B : NSRMust rely on neighbor routers to complete

C : NSFMust rely on neighbor routers to complete

D : NSRandNSFBy6Requires neighbor router to complete

Answer: C

Question 3

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 and 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?

Options :

A : 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.

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

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

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

Answer: B

Question 4

If faced with a complex network failure, and it is estimated that the troubleshooting cannot be completed in a short period of time, and the user urgently needs to restore the availability of the network, then the correct approach is

Options :

A : Tell the user it-s not possible

B : Directly build an alternative network environment without notifying customers

C : Always try to troubleshoot without informing the user of the current troubleshooting difficulty

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

Answer: D

Question 5

(Multiple Choice) Which LSAs in OSPFv3 can be flooded in an area?

Options :

A : Link-LSA

B : Inter-Area-Router-LSA

C : Inter-Area-Prefix-LSA

D : Intra-Area-Prefix-LSA

Answer: D

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