Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 461

Which technique removes the outermost label of an MPLS-tagged packet before the packet is forwarded to an adjacent LER?

Answer options

• A. explicit-null
• B. PHP
• C. label swap
• D. label imposition

Correct answer: B

Explanation

The correct answer, PHP (Penultimate Hop Popping), specifically refers to the process of removing the outermost MPLS label just before the packet reaches its next hop. The other options, such as explicit-null, label swap, and label imposition, do not pertain to this specific action and serve different functions in MPLS packet handling.