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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Nenita

6 months ago

Candidate 1: I think in this situation, the fastest way back to the original path would be to reach router R2, so answer A makes sense.

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Ronald

6 months ago

Candidate 2: I'm not sure about that, but it seems plausible. Can anyone provide more insight on this question?

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Galen

6 months ago

Candidate 4: Candidate 3 makes a good point, R1 would forward the packets towards R4 in this scenario.

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Ashlyn

6 months ago

Candidate 3: I believe the answer is C, to reach router R4, the tail-end of the active segment.

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Casandra

6 months ago

Candidate 2: I agree with Candidate 1, R1 would add the proper FRR encapsulation to reach R2.

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Verdell

7 months ago

Candidate 1: I think the answer is A, to reach router R2, the LSP's intended next-hop.

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Ines

7 months ago

I think the answer is B) To reach router R5, which is the shortest way to go back to the original path.

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Cecil

7 months ago

I see where Melissa is coming from. Choosing the tail-end of the active segment does make sense in this scenario.

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Melissa

7 months ago

I disagree with Chi. I believe the answer is C) To reach router R4, which is the tail-end of the active segment.

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Chi

7 months ago

I think the answer is A) To reach router R2, which is the LSP's intended next-hop.

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Melynda

7 months ago

Option C seems correct to me.

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Mona

7 months ago

But what about option C?

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Elinore

7 months ago

I believe the answer is A.

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Keneth

8 months 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

8 months 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

8 months 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

8 months 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

8 months 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

8 months 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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