Nokia Certified Network Associate (NCNA) — Question 63

What operation is performed by an egress Label Edge Router (eLER) when it receives an MPLS labeled packet?

Answer options

• A. It forwards the packet to the next LSR without altering the MPLS label.
• B. It swaps the MPLS label and forwards the packet to the next LSR.
• C. It pushes a new MPLS label and forwards the packet to the next LSR.
• D. It pops the MPLS label and forwards the packet to the next IP router.

Correct answer: D

Explanation

The correct answer is D because an egress Label Edge Router (eLER) is responsible for removing the MPLS label from packets before they are forwarded to traditional IP routers. Options A, B, and C are incorrect because they describe actions that do not occur at the eLER, which does not forward, swap, or push labels but instead pops the MPLS label.