Which MPLS label is the signaled value to activate PHP (penultimate hop popping)?
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A. B. C. D. E.E.
MPLS (Multiprotocol Label Switching) is a protocol used to efficiently route traffic across networks. PHP (Penultimate Hop Popping) is a technique used in MPLS networks to reduce the processing load on the last-hop router by popping off the penultimate hop label at the penultimate hop router.
The MPLS label signaled to activate PHP is the Imp-null label. When a label-switched packet (LSP) arrives at the penultimate hop router with an Imp-null label, the router removes the label and forwards the packet to the final destination. The PHP technique allows for more efficient use of network resources by reducing the number of labels that need to be processed at the last-hop router.
Therefore, the correct answer to this question is E. imp-null.