Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 189

Which function does LDP provide in an MPLS topology?

Answer options

• A. It enables a MPLS topology to connect multiple VPNs to P routers.
• B. It provides hop-by-hop forwarding in an MPLS topology for LSRs.
• C. It exchanges routes for MPLS VPNs across different VRFs.
• D. It provides a means for LSRs to exchange IP routes.

Correct answer: B

Explanation

The correct answer is B because LDP (Label Distribution Protocol) is responsible for establishing label-switched paths and enabling hop-by-hop forwarding for Label Switch Routers (LSRs) in an MPLS topology. Options A, C, and D are incorrect as they describe functions that are not directly related to LDP's primary role in forwarding packets using labels.