Designing Cisco Enterprise Networks (ENSLD) — Question 135

An ISP provides Layer 3 VPN service over MPLS to a customer with four branches and multiple CE routers at each branch. To exchange the routes that are learned from the CE routers, which BGP address family should the ISP activate among the PE routers?

Answer options

• A. address-family multicast
• B. L2VPN EVPN
• C. VPNv4 unicast
• D. IPv4 unicast

Correct answer: C

Explanation

The correct answer is C, VPNv4 unicast, as it is specifically designed for Layer 3 VPN services to exchange routing information across MPLS networks. Options A and B are not applicable because multicast and L2VPN EVPN address families are used for different purposes, while option D, IPv4 unicast, does not provide the necessary encapsulation for VPN routing.