Neighbor – A neighbor refers to a connected (adjacent) router that is running an OSPF process with the adjacent interface assigned to the same area. Neighbors are found by Hello packets.
Adjacency - An adjacency refers to the logical connection between a router and its corresponding designated routers and backup designed routers.
Link – In OSPF, a link refers to a network of a router interface assigned to any given network. Within OSPF, link is synonymous with interface.
Interface – An interface is a physical interface on a router. When an interface is added to