By default, which router in an MPLS LSP removes the MPLS header?
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A. B. C. D.A
In an MPLS LSP (Label Switched Path), the MPLS header is added to the packet at the ingress router and it is removed at the egress router. The MPLS header is used to forward the packet through the MPLS network based on the label assigned to it.
Therefore, the correct answer to this question is B. egress router.
The egress router is the last router in the LSP and it is responsible for removing the MPLS header from the packet and forwarding it to the next hop based on the underlying IP header. The egress router is the only router in the LSP that knows the ultimate destination of the packet and it is responsible for delivering the packet to the correct destination.
The penultimate router is the router that is just before the egress router in the LSP. It does not remove the MPLS header but instead swaps it with a new label that will be used to forward the packet to the egress router.
The ingress router is the router where the packet enters the MPLS network. It is responsible for assigning a label to the packet and forwarding it to the next hop based on the label. The ingress router does not remove the MPLS header.
The ultimate router is not a term commonly used in the context of MPLS LSPs.
In conclusion, the egress router is the router that removes the MPLS header from the packet in an MPLS LSP.