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Ericsson Exam ECP-206 Topic 2 Question 28 Discussion

Actual exam question for Ericsson's ECP-206 exam
Question #: 28
Topic #: 2
[All ECP-206 Questions]

What does an LDP implicit null label cause?

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Suggested Answer: B

An LDP implicit null label causes penultimate hop popping by a downstream router. LDP is a protocol that distributes labels for MPLS forwarding along the shortest path calculated by an IGP. An implicit null label is a special label value of 3 that indicates that the downstream router does not need a label to forward the packet to its destination. When an upstream router receives an implicit null label from a downstream router, it removes (or pops) the label from the packet before sending it to the downstream router.This process is called penultimate hop popping (PHP) and it reduces the load on the downstream router, which can forward the packet based on its IP header or another label in the stack59.


by Katina at Sep 18, 2024, 03:50 PM

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Jordan
9 months ago
I'm just going to go with B. Penultimate hop popping by a downstream router sounds like the most sensible option to me.
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Gail
9 months ago
Wait, is there a trick question here? I thought LDP implicit null labels were supposed to make things easier, not more confusing!
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Barbra
8 months ago
C) forwarding the packet unchanged
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Staci
9 months ago
B) penultimate hop popping by a downstream router
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Annett
9 months ago
A) swapping with a new label
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Vashti
10 months ago
I'm not sure, but I think it might be D) penultimate hop popping by an upstream router instead.
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Daron
10 months ago
I agree with Alyce, because the implicit null label is used to signal the penultimate hop to pop the label.
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Celestina
10 months ago
D has to be the answer. Penultimate hop popping by an upstream router is the expected behavior, right?
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Katheryn
8 months ago
That's correct, the LDP implicit null label causes penultimate hop popping by an upstream router.
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Goldie
8 months ago
I agree, it causes penultimate hop popping by an upstream router.
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Virgie
8 months ago
Yes, penultimate hop popping by an upstream router is the expected behavior.
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Theola
8 months ago
I think you're right, D is the answer.
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Maryln
10 months ago
I think C is the correct answer. Forwarding the packet unchanged seems like the logical choice for an LDP implicit null label.
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Essie
9 months ago
Yes, that's correct. The LDP implicit null label causes the packet to be forwarded unchanged.
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Javier
9 months ago
I agree, forwarding the packet unchanged makes sense.
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Teddy
9 months ago
I think C is the correct answer.
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Shaun
10 months ago
Option B makes sense to me. The penultimate hop popping by a downstream router seems like the right behavior for an LDP implicit null label.
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Mindy
9 months ago
No, it actually causes penultimate hop popping by a downstream router.
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Dick
9 months ago
So, the packet is forwarded unchanged?
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Hildred
9 months ago
Yes, that's correct. It is the behavior for an LDP implicit null label.
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Tayna
9 months ago
I think it causes penultimate hop popping by a downstream router.
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Alyce
10 months ago
I think the answer is B) penultimate hop popping by a downstream router.
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