A computer network is an interconnected collection of computing devices that communicate with each other via one or more common communication protocols. A computer network may consist of just two devices (e.g., a personal computer and a printer) or it may include thousands of devices. The devices that make up a computer network may be located anywhere in the world and they may use any number of different operating systems and programming languages.
In this video Introduction to Computer Network is discussed with real life example.
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