(1) A subset of a data entry database (DEDB) that is defined as a VSAM entry-sequenced data set (ESDS). Each area in a DEDB consists of a root-addressable part, an independent-overflow part, and a sequential-dependent part. Areas contain the entire logical structure for a set of root segments and their dependent segments.
(2) In a link-state routing protocol, groups of contiguous networks and attached hosts. An autonomous system can be divided into areas, which are connected to each other by routers. Routers within the same area share an identical link-state database. See also autonomous system.