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Computer networks are set of connected devices that is use to sharing digital data from one device to another device. Computer networks vary in their size, topology, and organizational purpose, as well as in the physical media they employ to send signals and the communications protocols they use to manage network traffic. In this paper we discuss about introduction of computer network, network configuration, types of network, and real time challenges in computer network and computer security. There are so many protocols that are used for transmitting data from one device to another.