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单项选择题What is the action of "pop" in the context of MPLS switching?()

A、It removes the top label in the MPLS label stack.

B、It adds a top label in MPLS label stack.

C、It replaces the top label in the MPLS label stack with another value.

D、It replaces the top label in the MPLS label stack with a set of labels.

E、None of above.

  • A
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