Nokia Exam 4A0-116 Topic 5 Question 25 Discussion

Actual exam question for Nokia's 4A0-116 exam

Question #: 25
Topic #: 5

The exhibit presents packets being transmitted inside an LSP's multi-segment primary path going from router R1 to router R8. The LSP also has a standby secondary path, and Seamless-BFD has been enabled on the primary path. The link between routers R1 and R2 fails, and fast re-route (FRR) is triggered. As a result, router R1 forwards the packets to router R3 and adds the proper FRR encapsulation to reach which router?

ATo reach router R2, which is the LSP's intended next-hop.

BTo reach router R5, which is the shortest way to go back to the original path.

CTo reach router R4, which is the tail-end of the active segment.

DTo reach router R8, which is the tail-end of the LSP.

Show Suggested Answer

Suggested Answer: B

by Terrilyn at Apr 14, 2024, 10:15 AM

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Keneth

10 days ago

I know I've studied this stuff before, but my brain is just not cooperating right now. Maybe I should take a quick break and come back to it with a fresh perspective.

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Christiane

11 days ago

Wait, doesn't Seamless-BFD come into play here somehow? I feel like that detail has to be important, but I'm not sure how to incorporate it into the answer.

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Page

12 days ago

Okay, let me think this through step-by-step. If FRR is triggered, then R1 should be forwarding the packets to the next-hop along the backup path, which is R3. So I'm guessing the answer is C, R4, since that's the tail-end of the active segment.

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Meaghan

13 days ago

Haha, I bet the test-writers are really trying to trip us up with this one! They're probably hoping we'll get confused by all the different routers and paths.

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Marisha

16 days ago

Hmm, the exhibit shows the packets being forwarded after the link between R1 and R2 fails, but it's not clear to me where the FRR encapsulation is being added. I'll have to re-read the question carefully.

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Anthony

17 days ago

Wow, this question seems pretty tricky! I'm not sure I fully understand the concept of FRR and how it relates to the multi-segment primary path. This is going to require some careful thinking.

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