Refer to the exhibit. Routers R1 and R2 are RFC 5036-based MPLS-enabled core routers MPLS IP is enabled globally on both routers OSPF with area 0 configuration is used as an interior routing…

Question

Exhibit

Options

• AConfigure network 10.10.140.192 0.0.0.0 arta 0 under the OSPF configuration on R2
• BConfigure mpls label protocol Idp under the Gi0/0 interface on R1
• CConfigure mpls ip under the Gi0'0 interface on R1
• DConfigure network 10.10.140.192 0.0.0.255 arta 0 under the OSPF configuration on R2
• EConfigure labtl mpls ip protocol tdp under the Gi0 0 interface on R1

• A
  77% (43)
• B
  14% (8)
• D
  4% (2)
• E
  5% (3)

Explanation

Two issues must be corrected for LDP to establish sessions on R1. First (Option C), even when 'mpls ip' is enabled globally on a router, it must also be explicitly enabled on each individual interface with 'mpls ip' for LDP to run on that interface. Without this, LDP hellos are not sent out Gi0/0 and no adjacency forms. Second (Option A), LDP uses the router's loopback address as its LDP Router ID, and for a TCP LDP session to establish, that loopback must be reachable in the IGP. Configuring 'network 10.10.140.192 0.0.0.0 area 0' (a /32 wildcard mask matching only that host) on R2's OSPF ensures R2's loopback is advertised with the correct host-specific mask. Option D uses wildcard mask 0.0.0.255, which would match an entire /24 subnet rather than a single host - incorrect for a loopback. Option B is wrong because 'mpls label protocol ldp' is a global command, not an interface-level one, and LDP is already the default. Option E contains garbled syntax and is not a valid Cisco IOS command.

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