C. OSPF interface network types match. OSPF uses network types to determine how to exchange routing information (e.g., broadcast, point-to-point). Mismatched network types will prevent adjacency formation.
D. Authentication settings match. If authentication is configured on one device, it must be configured on the peer with matching credentials for adjacency to be established.
E. OSPF router IDs are unique. Each router in an OSPF domain must have a unique Router ID. Duplicate IDs will cause confusion and prevent proper routing.
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