Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 568

How do devices operate in MPLS L3VPN topology?

Answer options

• A. P routers provide connectivity between PE devices with MPLS switching.
• B. P and associated PE routers with IGP populate the VRF table in different VPNs.
• C. CE routers connect to the provider network and perform LSP functionality.
• D. P routers support PE to PE VPN tunnel without LSP functionality.

Correct answer: A

Explanation

Option A is correct because P routers are responsible for providing the essential connectivity between Provider Edge (PE) routers using MPLS switching techniques. The other options are misleading; B incorrectly suggests that P routers populate the VRF table, C misattributes LSP functionality to CE routers, and D inaccurately states that P routers can support PE to PE tunnels without LSP functionality.