router

Routers can also be called gateway devices. Router is the network layer relay and the third layer relay task completed in OSI/RM, which stores and forwards data packets between different networks, and its main purpose is to separate networks in different logics. Data is transmitted from one subnet to another subnet and can be processed through the routing function of the router. In network communication, routers have the function of judging network addresses and selecting IP paths. They can build flexible link systems in multiple network environments and link subnets through different data grouping and media access methods. In operation, the router only accepts the information transmitted by the source station or other related routers, and is an interconnection device based on the network layer.