350-501 Question #500: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. A service provider is running MPLS in the core to support Layer 3 VPN. OSPF is configured to support dynamic routing, and BGP is enabled throughout the network. A network engineer is adding a new P router to the infrastructure and is connecting it to P1 and P3. Which task must the engineer perform on the new router to allow it to participate in the Layer 3 VPN?

Options

• AEstablish an LDP neighbor relationship with P1 and P3.
• BEnable LDP sync under the OSPF routing process.
• CEnable LDP and establish an OSPF adjacency in a new area.
• DConfigure OSPF and BGP to support MPLS.

Explanation

To integrate the new P router into the existing MPLS Layer 3 VPN infrastructure, the following steps are necessary: - Ensure the new router establishes OSPF adjacencies with its neighbors (P1 and P3) in the - OSPF will handle the IGP routing within the MPLS core. - Enable MPLS on all interfaces participating in the core to allow Label Distribution Protocol (LDP) to establish label-switched paths (LSPs). BGP Configuration: - Although the new router is a P (Provider) router and does not directly interact with customer routes, it needs to support MPLS forwarding for BGP-labeled routes between PE routers. BGP is used to advertise VPN routes among PE routers, and the P router ensures the MPLS labels are forwarded correctly. This configuration ensures that the new P router can participate in the MPLS core and forward VPN traffic without disrupting the existing Layer 3 VPN. Options like LDP sync and new OSPF areas are not necessary in this context.

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