Earlier a single computer served the whole organization's computational needs. But now a large number of seperate computers are capable of working individually and get the tasks done. But all these individual computers should be able to share and exchange the data and information in order to complete the organizational needs. This is possible by interconnecting the computers. These systems are called Computer Networks. There are two ways to communicate in a network. It can be a broadcast network, where a single communication channel is shared by all networks. The data is sent by any one of the system and any other system receives it. The system checks if the packets are intended for itself, if yes, it accepts the packets or it ignores. The data can also be sent to all the systems in the network. We can also have point to point networks, where there exists many computers between the source and the destination.
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