The router is divided into local router and remote router. The local router is used to connect the network transmission medium, such as optical fiber, coaxial cable and twisted pair cable. The remote router is used to connect the remote transmission medium, and requires corresponding equipment, such as telephone line, to be equipped with modem, and wireless through wireless receiver and transmitter. Router is the main node device of Internet. The router determines the forwarding of data by routing.
Forwarding policy is called routing, which is the origin of router name. As the hub of interconnection between different networks, router system constitutes the main thread of Internet based on TCP / IP, which can also be said that router constitutes the skeleton of Internet. Its processing speed is one of the main bottlenecks of network communication, and its reliability directly affects the quality of network interconnection. Therefore, router technology has always been at the core of campus network, regional network and even the whole Internet research field. Its development process and direction has become a miniature of the whole Internet research. At present, with the development of network infrastructure and information construction in our country, it is of great significance to discuss the role, status and development direction of routers in the interconnection network for the domestic network technology research and network construction, as well as to make clear the various specious concepts of routers and network interconnection in the network market.