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8.2.1 Advantages of Computer Networks

Fig. 8.2: The Network Diagram

Let us now discuss why networks are essential. Are there any advantages of networked computers
over stand-alone machines? Yes, networked systems are far better. A network uses a distributed
processing system in which a task is divided among several devices which are interconnected with
each other. Therefore, instead of a single computer being responsible for completing the entire
task, all the interconnected computers are responsible for completing the task assigned to them.
This leads to better performance with high processing speed.

Networks have several advantages which are described below:
(a) Resource Sharing: The primary use of a network is to share among users programs/
applications, data and peripheral devices connected to the network, irrespective of their
physical location. You must have noticed in your networked computer labs that when a print
command is given on one computer, the document is printed by a printer attached to some
other system. This allows printing of documents by several users and, hence, the printer is
shared by multiple users on the network. Other resources like hard disk, DVD drive, scanner,
etc., can also be shared on a computer network. For example, sharing database, audio and
video files, antivirus software, application software, printers and scanners, etc.
(b) Improved Communication: A computer network enables fast, reliable and secure
communication between users. It saves time and offers easy communication methods. For
Computer Science with Python–XII 8.2 (c) Reduced Communication Cost: Sharing resources also reduces communication cost.
example, in an organization, managers work at different locations to make financial reports.
While working on a network, any change made by one manager on his/her computer can easily
be seen by other managers and employees. Thus, a network allows managers to easily update
information. This increases their efficiency and allows them to complete their work quickly.

Using public networks, we can send a large quantity of data at a low cost. Internet anmjd
mobile networks are playing a very important role in sending and receiving text, image,
audio and video data at a low cost.
(d) Reliability of Data: Reliability means backing up of data, i.e., data can be copied and
stored on multiple computers. In a network system, all computers are connected to each