NCERT Class 12 Computer Science Computer Science: Chapter 10 — Computer Networks
This chapter introduces the concept of Computer Networks, defining a network as an interconnection of two or more similar things or people. It highlights how computer networks enable sharing of data and resources among interconnected computers and computing devices. The text explains that networks can vary in size and include various hosts like servers and laptops. It also mentions essential networking devices such as switches and routers, and introduces the concept of data being divided into packets for communication. Devices can be connected via wired or wireless media. Finally, it defines a 'node' as any device within a network capable of receiving, creating, storing, or sending data, including modems, hubs, switches, routers, and computers. This chapter lays the foundation for understanding the interconnected digital world and its underlying infrastructure, crucial for CBSE Computer Science students.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 12 |
| Subject | Computer Science |
| Book | Computer Science |
| Chapter | Chapter 10 — Computer Networks |
| Language | English |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 2 minutes |
| Word count | 310 |
Learning outcomes
- Define a computer network and its purpose.
- Identify different types of networks and networking devices.
- Understand the concept of nodes and data packets in network communication.
- Recognize the importance of interconnectedness in the digital world.
Vocabulary
| Word | Meaning |
|---|---|
| Network | A group of two or more similar things or people interconnected with each other. |
| Computer Network | An interconnection among two or more computers or computing devices that allows them to share data and resources. |
| Node | Each device that is part of a network and can receive, create, store, or send data. |
| Packet | Smaller chunks of data that are carried over a network during communication. |
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Practice questions
- What is a network? Answer: A network is a group of two or more similar things or people interconnected with each other.
- Define a computer network. Answer: A computer network is an interconnection among two or more computers or computing devices that allows them to share data and resources.
- What are packets in the context of networking? Answer: Packets are smaller chunks of data that are divided and carried over a network for communication.
- What is a node in a network? Answer: A node is any device within a network that can receive, create, store, or send data.
Practice MCQs
Q1. What is the primary function of a computer network?
Explanation: Computer networks are designed to allow interconnected computers to share data and resources among each other.
Q2. What are the smaller chunks of data called that are carried over a network?
Explanation: Data in a network is divided into smaller chunks called packets for efficient transmission.
Q3. Which of the following can be considered a node in a network?
Explanation: A node is any device within a network capable of receiving, creating, storing, or sending data, which includes printers, routers, and servers.
Q4. How can devices in a network be connected?
Explanation: Devices in a network can be connected using either wired media like cables or wireless media like air.
Q5. The quote "Hoaxes prey on the Human Operating System" relates to which aspect of networking?
Explanation: The quote highlights how hoaxes exploit human behavior, which is a factor in network security and the spread of misinformation.
Frequently asked questions
What is a computer network?
A computer network is an interconnection of two or more computers or computing devices that allows them to share data and resources.
What is the purpose of networking devices like switches and routers?
Networking devices are used to connect multiple computers in different settings and facilitate communication within the network.
How is data transmitted in a computer network?
Data is divided into smaller chunks called packets, which are then carried over the network for communication.
What is a node in the context of computer networks?
A node is any device within a network that can receive, create, store, or send data, such as a computer, server, or printer.
Can devices be connected wirelessly in a computer network?
Yes, devices in a network can be connected either through wired media like cables or wireless media like air.
Related resources
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Topics covered
NCERT Class 12 Computer Science — Computer Science — Chapter 10 — Computer Networks. Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.