Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 392

Router R1 is configured using VRF’s to support customer VPN’s. Some customers are using the same private IP address space. Which of the following is used to ensure that these routes are unique when advertised throughout the VPN?

Answer options

• A. Route Distinguisher
• B. Route Targets
• C. MP-BGP
• D. LDP

Correct answer: A

Explanation

The correct answer is A, Route Distinguisher, because it provides a way to differentiate routes that may have the same IP addresses within different VPNs. Route Targets (B) are used for import and export of routes, MP-BGP (C) is for exchanging routing information, and LDP (D) is related to label distribution, none of which address the uniqueness of routes directly.