Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 73

What are two purposes of using IPv4 and VPNv4 address-family configurations in a Layer 3 MPLS VPN? (Choose two.)

Answer options

• A. RD is prepended to the IPv4 route to make it unique.
• B. The VPNv4 address consists of a 64-bit route distinguisher that is prepended to the IPv4 prefix.
• C. MP-BGP is used to allow overlapping IPv4 addresses between customers to advertise through the network.
• D. The IPv4 address is needed to tag the MPLS label.
• E. The VPNv4 address is used to advertise the MPLS VPN label.

Correct answer: A, E

Explanation

Option A is correct because the Route Distinguisher (RD) is necessary to ensure the uniqueness of the routes in MPLS VPNs. Option E is also correct as the VPNv4 address is specifically used for advertising the MPLS VPN labels. Options B, C, and D do not accurately describe the primary purposes of the IPv4 and VPNv4 configurations in this context.