OSPF categorizes network segments into three types. The frequency and types of communication occurring between OSPF devices connected to these networks is impacted by the network type:- Point-to-point: Point-to-point networks directly link two routers.- Multi-access: Multi-access networks support the attachment of more than two routers.They are further subdivided into two types:– Broadcast networks have the capability of simultaneously directing a packet to all attached routers. This capability uses an address that is recognized by all devices. Ethernet and token-ring LANs are examples of OSPF broadcast multi-access networks.- Non-broadcast networks do not have broadcasting capabilities. Each packet must be specifically addressed to every router in the network. X.25 and frame relay networks are examples of OSPF non-broadcastmulti-access networks.- Point-to-multipoint: Point-to-multipoint networks are a special case of multi-access, non-broadcast networks. In a point-to-multipoint network, a device is not required to have a direct connection to every other device. This is known as a partially meshed environment.
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