Computer Networks and Communications Notes Grade 8

 Computer Science Grade 8 Unit #1 Notes Q/A

Computer Networks and Communications

Many computer systems are now connected together to communicate each other, this is called a computer network. These networks may be consists of only few computers or maybe a large network such as internet. In this chapter of the book computer science grade 8, we will discuss computer networks and communications.

To help the students, we are providing Q/A, MCQs, and short questions in this article. To cover the chapter completely we have divided this chapter into many short questions.

Q. 1. What is a network?

Ans. A computer network is the interconnection of two or more computer systems located in the same room, same building, or maybe at different places.

Q. 2. What is the benefit of computer network?

Ans. Computer network enables the sharing of information, programs and hardware components. With the help of a computer network, many computers can share their devices such as printers or hard disks.

Q. 3.  What are the components of computer networks?

Ans. A computer network consists of four base components:

  1. Sending Device
  2. Receiving Device
  3. Communication Device
  4. Transmission Medium

Q. 4. What is meant by sending device?

Ans. A device that sends message data or information to other computers is sending device.

Q. 5. What is receiving device?

Ans. In a computer network which device receive messages and receives information from the sending device is receiving device.

Q. 6. What is a communication device?

Ans. Communication device creates link between sending and receiving device. Modem is a popular communication device.

Q. 7.  What is transmission media?

Ans. Transmission media is a path that is used to transfer data or information from one computer to another computer.

Server and Clients

In a computer network different computer perform different functions. According to their functions computers can be classified as clients and servers. 

Q. 8. What is server?

Ans. A server is a powerful computer that facilitates other computers by providing services. These services may include 

  • Processing Data
  • Storing Information
  • Sharing Softwares
  • User Authentication
  • Controlling and Managing network traffic

Q. 9. What is the client?

Ans. Client is a less powerful computer as compare to server. It can get files and information from the server computer.

Q. 10. How many types of computer network?

Ans. Based on distance or location, computer networks are classified into three types.

  1. LAN (Local Area Network)
  2. MAN (Metropolitan Area Network)
  3. WAN (Wide Area Network)

 Computer Networks

Q. 10. What is Local Area Network or LAN? 
Ans: LAN stands for Local Area Network. Local Area Network is confined to a small area. It may be limited  to a building or adjacent buildings.
Q. 11. What are the advantages of Local Area Network? 
  1. computers can share different devices like printers, storage devices scanning devices and CD-ROM, etc.
  2. Users can save their work on server. 
  3. Users can communicate with each other and transfer data easily. 

Q. 12. What are the disadvantages of LAN?

  1. Special security measures are needed to save data.
  2. Only a skilled person can maintain this network.

Q. 13. What is Metropolitan Area Network (MAN)?

Ans: It is a large area network that extends to a city or to a metropolitan region. It consists of two or more Local Area Networks. Cable TV Network is its example. 
Q. 14. What are the advantages of MAN?
Ans: Advantages of MAN
  1. It is bigger than LAN. 
  2. It transfers data at a very high speed. 

Q. 15. What are the disadvantages of MAN?

Ans: Disadvantages of MAN
  1. It is very expensive. 
  2. It is difficult to maintain

Q. 16. What is meant by WAN? 

Ans: WAN stands for Wide Area Network. It is a very large computer network covering a large area, such as a state, province, country, or the whole world. 
Q. 17. What are the advantages of WAN?
Ans: Advantages of Wide Area Network
  1.  Wide Area Network is used to connect a large number of people all over the world. 
  2. We can watch distant locations and offices through this network

Q. 18. What are the disadvantages of WAN?

Ans: Disadvantages of Wide Area Network
  1. Security is a big issue in this network
  2. To set up this type of network is very expensive. 
  3. Maintenance and troubleshooting in WAN is a very difficult task. 

Q. 19. What is MODEM?

Ans: A MODEM (Modulator and Demodulator) is device which is used to connect computer to internet. By connecting internet, we can get information, and send and receive data from one computer to another computer. 
Q. 20. What is Network Interface Card?  (NIC)
Ans: It is an expansion card that enables a computer to a network. Each NIC has a unique serial number. This number is used to identify the computer on network. 

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