A vital organizational tool for companies worldwide LANs are high-speed communication networks that link information over a small geographic area.
Modems are the basic device used to convert messages to and from different computers.
Fax Machines send data through analog phone lines to other offices. Multiplexer groups many signals together and sends them over a single medium at one time. Network Interface Card connects personal computers to local network and includes a network cable port. Network Processors Bridge connects two or more networks with common protocol and has little traffic control. Router can handle multiple protocols and provides more traffic control than a bridge.