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What Is a Network?

A computer network is a group of two or more PCs that are connected to each other and can communicate with each other over the medium that connects them. Usually they are connected by special network cables, but they may also connect by telephone lines, radio or infrared waves, or even over electric lines.

A local area network (LAN) is a small group of computers (usually less than 254 computers) that share a common cable and have to take turns using it. Most LANs these days use a cabling scheme called Ethernet. Other cabling schemes that are more or less widespread include token ring and AppleTalk (for networks of Macintosh computers).


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