Class 12 Computer Networks

Computer Networks
Computer Network
Wired and Wireless Networks
New Technologies
Network Devices
Network Stack
IP Addresses
Network Protocols
Network Tools and Applications
Switching Techniques
Network Topologies
Full Forms
Important Questions

Computer Networks

Introduction to Computer Networks

A collection of interconnected computers is called a Computer Network. Two computers or devices are said to be interconnected if they are capable of sharing and exchanging information with each other by following a protocol.

Advantages of Computer Networks

• Resource sharing
• Improved communication
• Reduced communication cost
• Reliability of data
• Central storage of data

Structure of a network

A network comprises of several components along with their functionalities that contribute to its smooth functioning. A computer network comprises of :


A device or a computer that sends the data.


A device or a computer that receives the data.


Message is the information to be communicated. It may be text, image, audio, or video.

Transmission medium

A transmission medium is a physical path through which the data flows from sender to receiver. A cable or wire or Radiowaves can be the medium.


A set of rules that governs data transmission. It represents the communication methods which are to be followed by the sending and receiving devices.