In Penultimate Hop Popping (PHP), the penultimate router (the second-to-last router in the path) removes (or "pops off") the MPLS transport label, not the last router (which is the egress LSR).
The last P router (egress LSR) simply forwards the unlabeled packet to the Customer Edge (CE) router, without performing any label operations.
A is correct. This way the PE receives a packet without the LDP label, and doesn't have to do an extra lookup in the LFIB before forwarding the packet to a non-MPLS router like CE.
its A: PHP can be performed in frame-based MPLS networks. In these networks, the last P router in the LSP tunnel pops the LDP label as previously requested by the egress PE router through LDP. So, the PE router receives a labeled packet that contains only the VPN label.
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