what is the default administrative distance assigned to all ospf routes
Administrative distance On Cisco routers, routes issued by OSPF have a lower default administrative distance than routes issued by the Routing Information Protocol. By default, OSPF has a default administrative distance of 110 and RIP has a default administrative of 120.
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Open Shortest Path First An OSPF network can be structured, or subdivided, into routing areas to simplify administration and optimize traffic and resource utilization. Areas are identified by 32-bit numbers, expressed either simply in decimal, or often in the same dot-decimal notation used for IPv4 addresses. By convention, area 0 (zero), or 0.0.0.0, represents the core or backbone area of an OSPF network. While the identifications of other areas may be chosen at will; administrators often select the IP address of a main router in an area as the area identifier. Each additional area must have a connection to the OSPF backbone area. Such connections are maintained by an interconnecting router, known as an area border router (ABR). An ABR maintains separate link-state databases for each area it serves and maintains summarized routes for all areas in the network.