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Exam 4A0-103 topic 2 question 9 discussion

Actual exam question from Alcatel-Lucent's 4A0-103
Question #: 9
Topic #: 2
[All 4A0-103 Questions]

What MPLS function should be performed by a router that receives a data packet containing an MPLS label value of 3?

  • A. A router will never receive a packet containing this label value.
  • B. Request a new label from the peer that provided this label.
  • C. Pop the label.
  • D. PUSH an additional label onto the label stack.
  • E. Signal a new label to the peer that sent the packet.
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Suggested Answer: A 🗳️
by ablongo at Sept. 22, 2021, 6:22 p.m.

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mynssen3
1 year, 2 months ago
Selected Answer: C
So the answer is "C" - The label 3 ir related to the implicit null label
upvoted 1 times
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jenper
3 years, 1 month ago
So the answer is "C"
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ablongo
3 years, 2 months ago
Label Value: 3 Implicit Null — Used by the last hop (tail) node of the LSP to signal the Penultimate Hop Popping (PHP) behavior. When the LSP’s penultimate hop (second to last hop) receives a label mapping of 3, it will not put the label value into the MPSL packets to send to the tail node. Instead, the penultimate hop router pops up the label for the tail node. An MPLS data packet ingress to a node with label value 3 should never exist.
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