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What operation is performed by an LSR when it receives an MPLS labeled packet?

What operation is performed by an LSR when it receives an MPLS labeled packet?

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A.
The LSR refers to its MPLS label table, pops the label and forwards the packet to the
next IP router.

B.
The LSR refers to its routing table and forwards the packet to the next LSR or LER
without altering the MPLS label.

C.
The LSR refers to its MPLS label table, swaps the label and forwards the packet to the
next LSR or LER.

D.
The LSR refers to its MPLS label table forwards the packet to the next LSR or LER

without altering the MPLS label.

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