What is true about penultimate hop popping?

What is true about penultimate hop popping?

What is true about penultimate hop popping?

A.
It works on cell and frame mode MPLS networks.

B.
It allows double lookup on the egress router which is more efficient.

C.
It prevents the need for double lookup on an egress router.

D.
It causes the label to be popped one hop earlier.



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