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    Computer Network

                             NEED FOR COMPUTER NETWORK

                      Computers and other devices connected on a network help in:
                          Resource Sharing: It helps the users to share files and hardware devices such as printers, scanners,

                        etc.
                          Communication: It helps us to communicate with others through e-mail, video conference, instant
                        messaging, etc.

                             ADVANTAGES OF COMPUTER NETWORK

                      The advantages of computer network are:

                         The information can be easily shared with others.
                         Reduces the cost of hardware.
                         Store information in one centralised location.
                          Reliability implies backing up of information. If a system crashes, then the information is accessible
                        on another workstation for future use.

                         Reduction in installation cost.
                         User authentication process to secure the data.
                          People will have access to all the information they need to get and share through e-mail and instant
                        messaging which saves time and money in passing information.

                             COMPONENTS OF A DATA COMMUNICATION SYSTEM

                      There are mainly five components of a data communication system, which are as follows:
                         Sender: A sender is a device (usually a computer) that wants to send information to other computer
                        connected to the network.
                         Receiver: A receiver is a device that is receiving data from another device on the network.
                         Transmission  Medium: A transmission  medium is  a communication  channel through which
                        information is transferred from one device to another on a network.

                       8    Premium Edition-VIII

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