Huawei Exam H31-161 Topic 3 Question 35 Discussion

Actual exam question for Huawei's H31-161 exam

Question #: 35
Topic #: 3

Which of the following statements about the fault notification in VLL FRR are true?

AA forwarding fault occurs on the public network side of the primary PW. If BFD for PW (detection interval: 300 ms) is enabled on the primary PW, BFD fast detects the fault and sends a notification to the L2VPN for PW switching.

BA forwarding fault occurs on the public network side of the primary PW. If BFD for PW is not enabled on the primary PW, the L2VPN cannot perceive the fault on the PSN side and therefore PW switching is not triggered.

CThe primary PW is carried over an LDP LSP tunnel on the public network side and BFD for LDPLSP (detection interval: 30 ms) is enabled on the LDP LSP tunnel. If a forwarding fault occurs on the public network side of an LSP tunnel, BFD fast detects the fault and sends a notification to the L2VPN for PW switching.

DThe primary PW is carried over a GRE tunnel on the public network side and BFD for PW
(detection interval: 30 ms) is enabled on the GRE tunnel. If a forwarding fault occurs on the PSN side of the primary PW, BFD cannot detect the fault because the PW is carried over a GRE tunnel. In this case, the L2VPN needs to detect the fault itself and triggers PW switching.

Show Suggested Answer

Suggested Answer: A, C

by Vi at May 05, 2022, 12:53 AM

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