A computer network or data network is a telecommunications network that allows computers to exchange data. Networked computing devices pass data to each other along data connections. The connections (network links) between nodes are established using either wireless media or cable media. The best-known computer network is the Internet. Network computer devices that route and terminate the data are called network nodes. It can include hosts such as phones, personal computers, servers as well as networking hardware.
Computer networks support applications such as access to the World Wide Web, printers, shared use of application and storage servers and fax machines. Computer networks differ in the physical media used to transmit their signals, the network's size and the communications protocols to organize network traffic.
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