Definition of Internetwork

Internetworking involves connecting two or more distinct computer networks or network segments together to form an internetwork (often shortened to internet), using devices which operate at layer 3 (Network layer) of the OSI Basic Reference Model (such as routers or layer 3 switches) to connect them together to allow traffic to flow back and forth between them . The layer 3 routing devices guide traffic on the correct path (among several different ones usually available) across the complete internetwork to their destination.