Alcatel-Lucent NRS II – Wide Area Network Services — Question 29

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

Answer options

• 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.

Correct answer: A

Explanation

The correct answer is A because MPLS label values are predetermined and a value of 3 does not correspond to any valid label assigned in the network. Options B, C, D, and E are incorrect as they imply actions that a router can take with a valid MPLS label, which is not applicable here.