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Refer to the exhibit. The four PE routers in the network are connected and running OSPF to share routes. MPLS is enabled on the four routers. The routers are connected and configured to use /30 networks. A network engineer must implement Layer 3 VPN support for traffic between customer sites. Which task must the engineer perform?
Correct Answer: A
To support Layer 3 VPNs in an MPLS environment, Label Distribution Protocol (LDP) is required to establish label-switched paths (LSPs) between the Provider Edge (PE) routers. These LSPs are used to forward labeled traffic through the network. Configuring LDP neighbor relationships ensures that: - Label information is exchanged between adjacent routers. - MPLS forwarding tables are populated to enable end-to-end transport of VPN traffic. Tasks like deploying IGP (already done here via OSPF) or creating MPLS TE tunnels are unnecessary for basic MPLS Layer 3 VPN functionality. Updating the subnet to /24 is not relevant for MPLS VPNs, as /30 subnets are sufficient for point- to-point links.