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Open Shortest Path First (OSPF):

• In an OSPF autonomous system, the system is divided hierarchically into areas.

• Each area consists of the routers, which helps in broadcasting the link state to all other routers present in the area by running its own OSPF link-state routing algorithm.

• An area in an autonomous system is the set of networks and hosts that are grouped together. The area should be a collection of contiguous IP sub netted networks.

Introducing area in an autonomous system:

• In every autonomous system, one OSPF area is configured as the backbone area which is responsible for routing traffic between other areas in the autonomous system.

• OSPF area helps in knowing the link state of the routers.

Hence, concept of area is introduced for routing the traffic to route the packets in an autonomous system.

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