Answer Posted / harish kumar
OSPF is a link-state routing protocol. Which is required a hierarchical network structure and the structure divided into area like backbone area, regular area, and stub area. Every area must be connected to area 0 or backbone area. Each router can communicate with in an area and area id should be same for an area routers. If an router want to communicate with the other area router it must be connected through ABR router.
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