Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 334

Which label operations are performed by a label edge router?

Answer options

• A. SWAP and POP
• B. PUSH and POP
• C. SWAP and PUSH
• D. PUSH and PHP

Correct answer: B

Explanation

The correct answer is B, as label edge routers perform PUSH operations to add labels to packets and POP operations to remove labels from packets before forwarding them. The other options include SWAP, which is not a function of label edge routers, and PHP, which refers to a Penultimate Hop Popping scenario that does not apply to the functions of a label edge router.