Which label operations are performed by a label edge router?

Which label operations are performed by a label edge router?
A . SWAP and POP
B. SWAP and PUSH
C. PUSH and PHP
D. PUSH and POP

View Answer

Answer: D

Explanation:

A label edge router (LER, also known as edge LSR) is a router that operates at the edge of an MPLS network and acts as the entry and exit points for the network. LERs push an MPLS label onto an incoming packet and pop it off an outgoing packet.

Reference: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/nx-os/mpls/configuration/guide/mpls_cg/mp_mpls_overview.pdf