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Exam 4A0-103 topic 2 question 23 discussion

Actual exam question from Alcatel-Lucent's 4A0-103
Question #: 23
Topic #: 2
[All 4A0-103 Questions]

Click on the exhibit button below. Assume the following:

- The protected path is R1-R2-R3-R6.
- Fast reroute one-to-one protection is enabled.
If the original LSP already has two labels, and router R2 has failed, how many labels will there be in packets on the detour path?

  • A. 1
  • B. 2
  • C. 3
  • D. 4
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Suggested Answer: B 🗳️
by Manuel1990 at Oct. 31, 2020, 6:19 p.m.

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ablongo
3 months, 1 week ago
Correct Answer: B Facility backup takes advantage of the MPLS label stacking capability and uses a third label to encapsulate the protected traffic and carry it through the bypass tunnel. Note that the traffic encapsulation mechanism used is different from the encapsulation used for one-to-one backup.
upvoted 2 times
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sushant1991dhar
1 year, 1 month ago
The question says FRR is used so I think C is the answer
upvoted 1 times
Aessedai
9 months, 2 weeks ago
no, don't believe so - it's not facility backup which is where you'd have the additional label i.e. 3
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Manuel1990
1 year, 2 months ago
I think is C FRR add a new label in the detour path
upvoted 1 times
z3r0
1 year, 1 month ago
Only when FRR facility is used, the correct answer is B
upvoted 2 times
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