350-501 Question #485: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. MPLS is configured within the network. The routers use OSPF to exchange routing information. Hosts that are connected to routers R1 and R3 use routers R2 and R4 to access servers that run a variety of intranet applications. A network engineer must ensure that R1 and R3 maintain an LDP session between them to support the flow of traffic between hosts and servers. Which task should the engineer perform to provide LDP bindings in case of failure on the path between R1 and R3?

Options

• AImplement session protection to send targeted hellos between R1 and R3.
• BImplement multicast in the network to share data between hosts and servers without targeted
• CImplement BFD to monitor and detect link failures between R1 and R3.
• DImplement LDP sync on the four devices to give MPLS and OSPF the ability to maintain

Explanation

LDP (Label Distribution Protocol) session protection ensures that LDP sessions are maintained even if the direct path between two LSRs (Label Switch Routers) is lost. By enabling session protection, targeted hellos are sent between routers R1 and R3, allowing them to maintain their LDP session via alternate paths (through R2 and R4) in case of a link failure. This guarantees that MPLS label bindings remain intact, ensuring uninterrupted traffic flow between hosts and

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