What does the imp-null tag represent in the MPLS VPN cloud?

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Refer to the exhibit.

What does the imp-null tag represent in the MPLS VPN cloud?
A . Pop the label
B . Impose the label
C . Include the EXP bit
D . Exclude the EXP bit

Answer: A

Explanation:

The Dimp-null‖ (implicit null) tag instructs the upstream router to pop the tag entry off the tag stack before forwarding the packet.

Note: pop means Dremove the top MPLS label‖

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