350-501 Question #125: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. Router 1 is missing the route for the router 2 loopback 0. What should the engineer change to fix the problem?

Options

• Athe area numbers on Router 1 and Router 2 to be similar
• Bthe wildcard mask network statement in OSPF of Router 2
• CRouter 1 to be an ABR
• Dthe hello timers on Router 1 and Router 2 to be different

Explanation

For two OSPF routers to form an adjacency and exchange routes within a standard area, they must be configured to belong to the same OSPF area number.

Common mistakes.

• B. An incorrect wildcard mask in Router 2's OSPF network statement might prevent its loopback from being advertised, but it wouldn't be the primary reason for Router 1 missing the route if adjacencies aren't forming due to area mismatch.
• C. Router 1 becoming an ABR (Area Border Router) is relevant if R1 and R2 are in different areas and need to exchange inter-area routes, which is a different scenario from missing a directly connected loopback route in the same area.
• D. OSPF hello timers must be identical between neighbors for an adjacency to form; making them different would break, not fix, neighbor relationships.

Concept tested. OSPF Area Configuration

Reference. https://www.cisco.com/c/en/us/td/docs/ios/iproute/configuration/guide/irp_cfg.html

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