What are the commonly used communication media and network interconnecting devices?
Network interconnection equipment commonly used are: repeaters, bridges, routers, bridges by device (with bridges and routers, gateways, hubs, switches). Among them, repeaters, hubs, bridges used in the physical layer, data link layer switch used in bridge, by the router in the network layer, application layer gateway used in.
Communication medium (transmission medium), that is, network communication lines, the common transmission line has four basic types: coaxial cable, twisted pair, optical fiber and radio wave
