Saturday, January 22, 2011

Introduction To Networks

a. Networks Definition
A network consists of two or more computers that are linked in order to share resources (such as printers and CD-ROMs), exchange files, and allow electronic communications. The computers on a network may be linked through cables, telephone lines, radio waves, satellites or infrared light beams.

b. Benefits of Computer Networks

1. File Sharing -
Network file sharing between computers gives you more flexibility rather than using floppy drives or Zip drives. you can use the network to save copies of your important data on a different computer, examples share photos, music files and documents.

2. Sharing Devices.
Sharing devices is another benefit in which a network exceeds stand-alone computers. For example laser printers, fax machines, modems, scanners and CD-ROM players, when these peripherals are added to a network, they can be shared by many users.

3. Sharing Internet Access.
In computer network, students can access the internet simultaneously.

4. Speed.
Using a network is faster way for sharing and transferring files. Without a network, files are shared by copying them to floppy disk.

5. Cost.
Networkable versions of many popular software programmes are available at considerable savings compared to buying individual licensed copies. Its allows easier upgrading of the program.

6. Security.
Files and programmes on a network are more secure as the users do not have to worry about illegal copying of programmes. Passwords can be applied for specific directories to restrict access to unauthorized users.

7. Centralized Software Management.
One of the greatest benefits of installing a school network is the fact that all of the software can be loaded on one computer (the server). This saves time and energy when installing updates and tracking files.

8. Electronic Mail.
A network that provides the hardware necessary to install an e-mail system. E-mail’s help in personal and professional communication for all school personnel as it enables the spread of general information to the entire school staff. Example, electronic mail on LAN (Local Area Network) enables students to communicate with teachers and peers at their own school when connected to the Internet, it enables users to communicate with others.

9. Flexible Access.
School networks allow students to access their files from computers throughout the school. Some schools provide public access to students to begin an assignment in the computer lab and save then access the file when they are at a cyber café or home.

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