Question: The MPLS specification allows an LSR to use a technique known as penultimate hop popping. With this technique, the next-to-last LSR in an LSP is

The MPLS specification allows an LSR to use a technique known as penultimate hop popping. With this technique, the next-to-last LSR in an LSP is allowed to remove the label from a packet and send it without the label to the last LSR in that LSP.

a. Explain why this action is possible; that is, why it results in correct behavior.

b. What is the advantage of penultimate hop popping?

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