Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 254

How does an MPLS Layer 3 VPN differentiate the IP address space used between each VPN?

Answer options

• A. by RT
• B. by address family
• C. by RD
• D. by MP-BGP

Correct answer: C

Explanation

The correct answer is C, as the Route Distinguisher (RD) is used to ensure unique identification of VPN IP address spaces. Options A and D are related to routing and signaling, but they do not specifically address the differentiation of address spaces in the context of VPNs. Option B, while involving address families, does not specifically refer to how address spaces are separated within MPLS Layer 3 VPNs.