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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?
Suggested Answer: B
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30 comments · newest first
RO
Robt
6 months ago
I think C) 3 is correct. The reroute needs an extra label.
ED
Edelmira
7 months ago
I’m not sure, but D) 4 seems too high.
CO
Corazon
7 months ago
I agree with Flo. B) 2 makes sense.
MA
Marva
7 months ago
I feel like it’s A) 1. Just one label on the detour.
DO
Donte
7 months ago
I’m leaning towards C) 3. The detour adds a label.
FL
Flo
7 months ago
I think it’s B) 2. The original labels stay.
CA
Carylon
8 months ago
Totally agree, it’s definitely 3 labels!
SO
Sophia
8 months ago
Wait, how do we get 3? That seems off.
MY
Myong
8 months ago
The answer is definitely B) 2 labels. Unless, of course, it's not. In which case, I'm blaming the caffeine withdrawal.
DE
Devora
8 months ago
This question is a real head-scratcher. I'm going to need a label maker and a magnifying glass to figure this one out.
CA
Catalina
9 months ago
I bet the answer is D) 4 labels. You know, just to keep us on our toes.
GI
Gilma
9 months ago
Ah, the good old label-stacking game. I wonder if the exam proctors will let us use a label maker during the test.
SA
Salena
9 months ago
The answer is C) 3 labels. The original LSP has two labels, and with fast reroute one-to-one protection, an additional label will be added for the detour path.
NI
Nichelle
9 months ago
I’m confused about how the labels work in this scenario. I thought the detour would just use the existing labels, but I might be wrong.
CA
Carmen
9 months ago
This question seems similar to one we did in practice where we had to count labels after a failure. I think it might be 3 labels total.
LE
Lenna
9 months ago
I remember something about fast reroute and how it adds labels, but I can't recall if it adds one or two more.
BR
Brice
10 months ago
I think the detour path will still have the original labels, so maybe it’s 2? But I’m not entirely sure.
LU
Luz
10 months ago
I think I've got it. The original LSP has two labels, and the detour path will add one more label. So the total number of labels will be 3. C) is the right answer.
TO
Tonette
10 months ago
I think it’s 3 labels total!
AR
Argelia
10 months ago
The original LSP has 2 labels.
GA
Gail
10 months ago
If the original LSP already has two labels, then the detour path will have an additional label, so the answer must be C) 3 labels.
ME
Meghan
11 months ago
I'm not totally sure about this. I'll need to review the MPLS fast reroute concepts to make sure I'm understanding this correctly.
LE
Leanora
11 months ago
If R2 fails, we still need those labels on the detour.
DE
Detra
11 months ago
Okay, let's see. The protected path is R1-R2-R3-R6, and fast reroute one-to-one protection is enabled. If R2 fails, the detour path will be used.
ME
Meaghan
11 months ago
Hmm, this looks like a tricky MPLS question. I'll need to think through the details carefully.
ME
Melynda
6 months ago
Don't forget about the original labels! It could be D) 4.
MA
Maira
6 months ago
I’m leaning towards A) 1. Less complexity.
RE
Rebbecca
6 months ago
I believe it adds another label, so maybe C) 3?
LE
Lenita
6 months ago
But what about the detour path?
LE
Lenna
6 months ago
I think it's B) 2.