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Why do we need computer network?

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Why do we need computer network?

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(i) Network enable resource sharing across the globe.

(ii) Network provide high reliabilities by having alternate copies of data. Presence of multiple CPUs means that if one goes down, the others may be able to take over its work. This abilities to work in the face to hardware problems is of almost importance in military, banking, air traffic control, nuclear reactor safety, etc.

(iii) Network enable and client/server model with clients as small computers, one per user , with data kept on one or more shared file server machine. eg. Software installation can be on server and this can save cost of buying license for every machine.

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