Computer network is a group of computers and other devices connected through a communication channel that allows sharing of information and resources. Networks are building together with use of hardware and software, and the communication over a network is defined using a set of network protocols.
Networks are often classified according to its size and the communication channel used for interconnecting the individual devices in the network. These are the mainly used communication channels – coaxial cables, twisted pair cables, optical fibers, radio, etc.
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