To configure OSPF adjustments, start with a basic implementation of the OSPF routing protocol.

OSPF defines five network types, as shown in Figures 1 to 5:

A multiaccess network is a network with multiple devices on the same shared media, which are sharing communications. Ethernet LANs are the most common example of broadcast multiaccess networks. In broadcast networks, all devices on the network see all broadcast and multicast frames. They are multiaccess networks because there may be numerous hosts, printers, routers, and other devices that are all members of the same network.