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There are different kinds of computer networks that work in different ways. Networks
                  can be very small and simple or can be complex as a global network like the Internet. There

                  may be wired or wireless connections between computers on the network.

                    Need for Computer Network


                  Computers and other devices connected on a network help in:
           Prime (Ver. 2.2)-VIII  •  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:
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                  • The information can be easily shared by people.
                  • It 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 the 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-mails

                    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 computers 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 computer to another on a network.
                  • Message: A message is the information or data that needs to be transferred from one

                    device to another.
                  • Protocol: A protocol is a set of standard rules used for communication.
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