4A0-C03: Nokia NRS II Composite Exam: IS-IS versionDemo

By Nokia · Question Mode

QuestionQ24

Multiprotocol Label Switching

Which of the following statements about the implementation of explicit null is TRUE?

  • A The penultimate router will forward packets to the eLER, based on the IP header.
  • B The eLER will receive packets with a top label value of 0.
  • C The eLER will receive packets with a top label value of 3.
  • D The penultimate router will pop the top label from the packets.
Explanation

With IPv4 MPLS explicit null, the penultimate router forwards a packet carrying label value 0 to the egress LER. Unlike implicit null (label 3), explicit null does not instruct the penultimate router to pop the top label.

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