Exam 4A0-116 topic 1 question 23 discussion

Actual exam question from Nokia's 4A0-116

Question #: 23
Topic #: 1

An SR-TE LSP with a path definition that includes router R4 as a loose hop and for which Seamless-BFD has been enabled is following the path shown in the exhibit. What happens after router R4 fails if the routers along the path follow the default behavior?

A. The head end will periodically try to calculate a new path at a rate defined by the retry timer.
B. The head end will periodically try to calculate a new path at a rate defined by the resignal timer.
C. The head end will continue forwarding traffic to the current next-hop indefinitely, which will be discarded at the point of failure.
D. The head end will continue forwarding traffic to the current next-hop indefinitely, and R2 will redirect the traffic to R3 after IGP reconvergence.

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Suggested Answer: C 🗳️

by hazemsalah87 at June 13, 2023, 10:59 p.m.

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anothertwo

8 months, 3 weeks ago

Selected Answer: C

Answer is C. The two options for actions that an LSP will take when Seamless BFD session fails for the active path are: - None (this is the default action): When the Seamless BFD session goes DOWN, the LSP will remain UP and traffic will be blackholed. - Failover-or-down. When Seamless BFD session goes down, the headend will try to move the traffic to another LSP path if available. If no path is available, the LSP will change to DOWN.

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