<networking> A relationship between two network devices, e.g. routers,
which are connected by one media segment so that a packet sent by one can reach
the other without going through another network device. The concept of adjacency
is important in the exchange of routing information.
Adjacent SNA nodes are nodes connected to a given node with no intervening
nodes. In DECnet and OSI, adjacent nodes share a common segment (Ethernet, FDDI,
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