In OSI, DNA, or OSPF, a routing subdomain that maintains detailed routing information about its own internal composition, while also maintaining routing information that allows it to reach other routing areas.

a collection of networked end systems, routers, and transmission facilities organized by traffic patterns

a contiguous set of routers sharing network segments between them

a grouping of connected OSPF networks and hosts that share a session, and have a separate link database

a grouping of logically contiguous networks and hosts

an arbitrary collection of interconnected networks, hosts and routers

a set of routers that will share routing information about one or more networks

a stop within the bus routes associated to this tour

a subdomain maintaining detailed routing information about its own internal composition, and also maintains routing information which allows it to reach other routing subdomains

a web of highways and byways, so if you have your own wheels, there are always several routes to choose from

Within an autonomous system, groups that comprise contiguous networks and the hosts attached to them.

Routing subdomain that maintains detailed routing information about its own internal composition as well as routing information that allows it to reach other routing subdomains. In IS-IS, an area corresponds to a Level 1 subdomain. In IS-IS and OSPF, a set of contiguous networks and hosts within an autonomous system that have been administratively grouped together.