Class 9 Computer Chapter 3 Notes

Important MCQs and Short Questions of Class 9 Computer Chapter 3 Notes Networks 9th Class Computer Science Urdu Medium written by Sir Saud Khan. These computerized notes are very helpful in the preparation of Class 9 Computer Networking for students of Class 9 Computer Chapter 3 Notes these are according to the paper patterns of all Punjab boards.

• Here are the detailed 9th class computer chapter 3 notes to help you prepare for your exams.
• Networks Multiple Choice Questions ( MCQs ) with correct Answers and short questions
• Computer Network class 9: In our daily life, we use computers to browse the Internet, send/receive emails, play online games, watch online videos, download music, take online courses, read daily newspapers, etc. All such activities require a computer connected with some other computer to make a computer network. They can be linked through a wire or wirelessly. A communication medium connecting multiple computers is also called a communication channel.
• Definition: A computer network is a group of computer systems and other computing hardware devices linked together through communication channels. A network facilitates communication and resource-sharing among the connected devices. Networks are connected together to make a larger network which is called network of networks. The Internet is coinsiderd as the most well known exampe of network of networks.
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• Need of a Computer Network: A computer network is established for the purpose of sharing resources. Examples of resource sharing are given below.
• File sharing: Networking of computers helps a network user to share files. For example, if you need date sheet of your board examination, you can get the file through the Internet, without visiting BISE (Board of Intermediate and Secondary Education) office. Similarly, BISE requires your picture and your bio data for admission form. They can get all these files over a network. So, the file sharing is helpful to complete a task systematically.
• Example: If all your school teachers want to prepare a combined result using computers, they can share files over a school network or the Internet.
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• Moreover, sharing files with others who are living in a different city or even country is also much helpful and is done in the same way.
• Hardware sharing: Users can share devices such as printers, scanners, CD-ROM drives, hard disk drives etc. For example, in an office, usually there are less number of printers and scanners than the available number of computers. Using a network, these resources are shared to get a cost-efficient solution.
• Application sharing: Applications can be shared over the network. It means that more than one users may use the same application. For example, in a bank; cashier, manager, ATM (automated teller machine) users use same application over the network. Bank balance updated at one point is updated for all branches immediately.
• Important notes of computer science class 9 chapter 3 notes for Matriculation part-I students.
• Sharing a single Internet connection: Using a network at home or office, we can share one Internet connection with more than one user.
• User communication: Networks allow users to communicate using e-mail, newsgroups, and video conferencing etc. So, communication with many people sitting on different locations is possible due to a network.
• Example: A video conference comprises the technologies for the reception and transmission of audio- video signals by users at different locations.
• Increasing storage capacity: Storage capacity means the limit to store data in a computer. If we connect our computer to another computer having more storage, then we can also use the disk space of that computer. Computer networking notes class 9 In this way we can store and access files stored remotely. In this setup, a computer providing the storage is called file server and the computer accessing that space is called a workstation.
• Client Server: A server provides a service and a client gets that service. A client application requests some services from another application which acts as a server. When we access a website, we get contents on our screen served by a server.