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What is the purpose of an ABR in OSPF?
Establish a Connection between OSPF areas
Establish a connection between routing protocols
Establish a connection between backbone networks and OSPF areas
An area border router (ABR) is a router that is located on the logical border between one or more Open Shortest Path First (OSPF) areas. It is used to establish a connection between backbone networks and the OSPF areas. It is a member of both the main backbone network and the specific areas to which it connects, so it stores and maintains separate routing information or routing tables regarding the backbone and the topologies of the area to which it is connected.
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