Page 10 - Trackpad_V5_Book 8
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COMPUTER NETWORK

            A computer network is a collection of computers and their peripheral devices (the network’s
            components)  connected by  communication  links (wired or wireless) through which data  is
            transferred in the form of signals. In other words, a network is defined as a group of devices that
            are linked together to share information, data and resources.

            Note that a computer which is not connected to any network is known as a stand-alone computer
            and a computer connected to a network is known as a node or workstation.



                      NEED OF COMPUTER NETWORKING


            Networking is a way of getting all the devices to communicate with each other and use the same

            data files and resources through a physical pathway called the transmission medium (cables).
            This connection between devices can be either wired or wireless. Network serves the following
            important purposes:
            1.   It allows  information  or files to be shared

              with other computers in the network.
            2.   It allows  computers  in the network to
              share hardware like printers, scanners, fax

              machines, hard disks, etc.
            3.  It allows sharing of application software over
              the network.

            4.   It  allows rapid  communication  such  as
              e-mail, messaging, etc.

            5. It allows us to store information in one centralised location.
            6.  It is a cost-effective method.




                      COMPONENTS OF A NETWORK


            Before we discuss the components of a network, let us first understand the process of
            communication between two persons. When two persons communicate with each other, one
            speaks and the other listens. The person who is speaking is the sender and the person who is
            listening is the receiver of the information. The voice originating from the sender reaches the
            receiver through the air.

            Therefore, air is the communication channel. "Communication channel is the medium that helps
            carry information from one place to another." Now, let's learn about components of computer
            networks.



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