The BFD Echo function checks the connectivity of the forwarding link by looping back packets. Which of the following statements are true about this function?

• A.If URPF is enabled on the peer end, BFD packets may be incorrectly discarded on the peer end.
• B.In the BFD Echo function, the device uses the IP address of the outbound interface as the source IP address by default.
• C.The BFD Echo function applies only to single-hop BFD sessions.
• D.When configuring a BFD session supporting the BFD echo function, you need to configure both the local and remote discriminators.

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The output information of a certain router is as follows.

Please match the information on the left with the information on the right.

Correct Answer:

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The main function of MBGP is to help perform RPF verification of cross-domain multicast flows.

• A.FALSE
• B.TRUE

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

• A.AS-PATH
• B.PrefVal
• C.WITH
• D.LOCAL-PREF

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After which of the following parameters are modified does an IS-IS neighbor relationship need to re- established?

• A.The cost of an IS-IS interface is changed.
• B.The IP address of an ISIS interface is changed.
• C.The level of an ISIS interface is changed.
• D.The interval at which an IS-IS interface sends IIH packets is changed.

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