The Open Shortest Path First (OSPF) protocol, defined in RFC 2328, is an Interior Gateway Protocol used to distribute routing information within a single Autonomous System.
The OSPF protocol is based on link-state technology, which is a departure from the Bellman-Ford vector based algorithms used in traditional Internet routing protocols such as RIP. OSPF has introduced [...]

The Border Gateway Protocol (BGP) is an interautonomous system routing protocol. An autonomous system is a network or group of networks under a common administration and with common routing policies. BGP is used to exchange routing information for the Internet and is the protocol used between Internet service providers (ISP).
BGP is used between autonomous systems [...]

Two categories of protocol exist at the network layer: routed and routing.
A routed protocol is a Network Layer protocol that is used to move traffic between networks. Routed protocols allow a host on one network to communicate with a host on another, with routers forwarding traffic between the source and destination networks. IP, IPX, and [...]