Computer Networks and Communications Notes Grade 8

 Computer Science Grade 8 Unit #1 Notes Q/A

Computer Networks and Communications

 Computer Networks and Communications: A Comprehensive Overview


In today’s interconnected world, computer networks and communications play a crucial role in facilitating the exchange of information and enabling seamless connectivity. From local area networks (LANs) in our homes and offices to wide area networks (WANs) that span across the globe, computer networks have revolutionized the way we communicate and collaborate. This article provides a comprehensive overview of computer networks and communications, exploring key concepts, components, and their significance in modern society.

I. Understanding Computer Networks

A. Definition and Purpose
B. Types of Computer Networks
1. Local Area Networks (LANs)
2. Wide Area Networks (WANs)
3. Metropolitan Area Networks (MANs)
4. Wireless Networks

II. Key Components of Computer Networks

A. Network Devices
1. Routers
2. Switches
3. Hubs
4. Modems
B. Network Protocols

1. Transmission Control Protocol/Internet Protocol (TCP/IP)

2. Ethernet
3. Wi-Fi
C. Network Topologies
1. Star Topology
2. Bus Topology
3. Ring Topology
4. Mesh Topology

III. Benefits of Computer Networks and Communications
A. Enhanced Communication and Collaboration
B. Resource Sharing
C. Improved Efficiency and Productivity
D. Centralized Data Storage and Backup
E. Cost Savings

IV. Network Security and Challenges
A. Cybersecurity Threats
1. Malware and Viruses
2. Phishing Attacks
3. Denial of Service (DoS) Attacks
B. Data Privacy Concerns
C. Network Monitoring and Intrusion Detection

V. Emerging Trends and Technologies
A. Cloud Computing and Networking
B. Internet of Things (IoT)
C. Software-Defined Networking (SDN)
D. 5G and Next-Generation Networks

VI. Career Opportunities in Computer Networks and Communications
A. Network Administrator/Engineer
B. Network Security Specialist
C. Systems Analyst
D. Network Architect
E. Telecommunications Specialist


Computer networks and communications have become the backbone of our modern society, enabling seamless connectivity and information exchange. Understanding the fundamental concepts, components, and benefits of computer networks is crucial for both individuals and businesses. However, it is equally important to address the challenges associated with network security and privacy. As technology continues to evolve, staying updated with emerging trends and pursuing careers in computer networks and communications can open up exciting opportunities in the ever-growing field. With the right knowledge and expertise, individuals can contribute to the advancement of this vital domain and shape the future of connectivity.

Many computer systems are now connected together to communicate with each other, this is called a computer network. These networks may consist of only a few computers or maybe a large network such as the 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 a 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 a 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 a link between sending and receiving device. A 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 computers perform different functions. According to their functions, computers can be classified as clients and servers.

Q. 8. What is a 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. The client is a less powerful computer as compared to the server. It can get files and information from the server computer.

Q. 10. How many types of computer networks?

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 Networks?
  1. computers can share different devices like printers, storage devices scanning devices and CD-ROM, etc.
  2. Users can save their work on a 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 an 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. Setting 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 a device that is used to connect a computer to the 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 a network.

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