Which label operations are performed by a label edge router?

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

View Answer

Answer: D

Explanation

The entry and exit routers of an MPLS network are called edge LSR (or label edge routers C LER), which, respectively, inject (push) an MPLS label onto an incoming packet (label assignment) and remove (pop) it off the outgoing packet (label removal).