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Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) · Cisco
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Answer A Explanation: The imp-null (implicit null) tag instructs the upstream router to pop the tag entry off the tag stack before forwarding the packet. Note: pop means remove the top MPLS labe
PHP (Penultimate Hop Popping) When exchanging labels, the LER informs the LSR of Implicit Null with a label value of 3. When forwarding Implicit Null (imp-null) to the other party, LSR removes the label and forwards it.
The given answer is correct - Pop the label