Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 477

Which characteristic is representative of a hub-and-spoke topology between PE routers in a Layer 3 MPLS VPN network?

Answer options

• A. The PE routers use different RDs for each VRF to import and export M-BGP prefixes.
• B. Each PE router uses a different RD to identify all branches.
• C. The PE routers use different RTs to import and export M-BGP prefixes.
• D. The PE routers are configured with multiple VRFs for all branches.

Correct answer: C

Explanation

The correct answer, C, highlights that in a hub-and-spoke topology, PE routers utilize different Route Targets (RTs) to manage M-BGP prefixes for efficient routing. Options A, B, and D are incorrect as they incorrectly reference Route Distinguisher (RD) usage and the configuration of VRFs, which do not specifically represent the hub-and-spoke topology characteristic.