Class 9 Computer Chapter 3 Question Answer

Important MCQs and short questions notes of Class 9 Computer Chapter 3 Question Answer Networks in 9th Class Computer Science English 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 Question Answer these are according to the paper patterns of all Punjab boards.

• Networks Multiple Choice Questions ( MCQs ) with correct Answers
• 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. Our emails are also there on some server, and when we provide username and password, the server verifies credentials and serves our email records. An email user in this example is a client.
• A client is a process that accesses a service provided by a server. For example, to check email we use web browser as a client. The client provides a user interface to carry out actions, like giving username and password. It forwards requests to the server, which in return provides the required service. It is important to know whether a client is hardware or software. In general, a client is a hardware, where a cell phone, laptop and desktop computers are shown as clients, but in particular the software running on that hardware is the process which makes it a client.
• A server is a physical computer dedicated to run services to serve the needs of its clients. Depending on the service that is running, it could be a file server, database server, print server, or a web server.
• Physical Structure of Networks: Physical structure of networks can be classified in terms of type of connection and topology. In the following sections, we discuss these concepts in detail.
• Types of connection: Two devices can communicate with each other when they are connected in some way to the same link at the same time. Point to point and multipoint are two possible types of connections.
• Point-to-point connection: A point-to-point connection is a direct link only between two devices, i.e., a sender and a receiver. For example, there is a point to point connection between a remote control and a TV.
• Multipoint connection: In multipoint connection, there is a link between a sender and multiple receivers. So, more devices can share a single link. For example, in a Wi-Fi based network a single link is shared among multiple devices.
• Network topologies: Topology of a network is a geometric representation of the relationship among the interconnected devices. The four basic network topologies are bus, star, ring and mesh.
• Bus Topology: A bus topology connects all devices of the network through a single common cable having exactly two end points. This cable is called backbone of the topology. Bus topology offers a simple way to connect devices. All of the devices of the network are connected to a common transmission medium which has exactly two endpoints. In this simple form of networking, failure of any single device does not affect other devices connected with the cable. However, if there is some problem in the shared communication cable, then all other devices can stop functioning.
• Star Topology: A star topology connects all devices using point to point connections via cables to a central point. The central point is known as a Hub or Switch. The central device controls all the traffic. Therefore, devices can transfer data to each other only through the central point. It is easy to install and reconfigure. Star topology consumes more cable than the bus topology, however, if there is some problem in a cable, then only the respective computer gets disconnected from the network.