Cisco CCNP Enterprise (350-401 ENCOR)

In OSPF, what must match on both routers for a neighbor adjacency to form on a broadcast segment?

1. AArea ID, subnet/mask, hello and dead timers, and authentication must matchCorrect
2. BRouter IDs must be identical
3. CInterface bandwidth values must be identical
4. DProcess IDs must be identical

Why: For OSPF neighbors to reach full adjacency, the interfaces must share the same area, be on the same subnet, agree on hello and dead intervals, and pass any authentication. Router IDs must be unique, not identical, the process ID is locally significant, and interface bandwidth affects cost but not adjacency formation.

In a traditional three-tier enterprise campus design, which layer aggregates access-layer switches and typically enforces routing policy and redundancy between the access and core?

1. AData-center spine layer
2. BAccess layer
3. CCore layer
4. DDistribution layerCorrect

Why: The distribution layer aggregates access switches, provides Layer 3 boundaries, applies routing and policy, and offers redundancy toward the core. The access layer connects end devices, and the core provides high-speed, low-latency transport between distribution blocks. In a collapsed-core design the distribution and core functions merge.