Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 382

Which component of MPLS VPNs is used to extend the IP address so that an engineer is able to identify to which VPN it belongs?

Answer options

• A. RT
• B. RD
• C. LDP
• D. VPNv4 address family

Correct answer: B

Explanation

The correct answer is RD (Route Distinguisher), which is used to differentiate between identical IP addresses in different VPNs. RT (Route Target) is used for policy control in VPNs, LDP (Label Distribution Protocol) is involved in label distribution, and VPNv4 address family refers to the address space that includes both the route distinguisher and the IP address, but does not solely identify the VPN.