Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 384

What are the two reasons for RD and VPNv4 addresses in an MPLS Layer 3 VPN? (Choose two.)

Answer options

• A. VPN RT communities are used to identify customer unique routes.
• B. When the PE redistributes customer routes into MP-BGP, they must be unique.
• C. They are on a CE device to use for static configuration.
• D. They are used for a BGP session with the CE device.
• E. RD is prepended to each prefix to make routes unique.

Correct answer: B, E

Explanation

The correct answer choices, B and E, are key to ensuring that customer routes remain unique when redistributed into MP-BGP and that RD is used to achieve this uniqueness. Options A, C, and D do not accurately describe the roles of RD and VPNv4 addresses in the context of MPLS Layer 3 VPNs.