---
type: "Chapter"
knowledge_type: "chapter"
entity_type: "chapter"
id: "66def9cc3f8b4e9e69bdbe79"
title: "Data Communication"
board: "CBSE"
curriculum: "CBSE"
class: "Class 12"
subject: "Computer Science"
book: "Computer Science"
chapter: "Data Communication"
chapter_slug: "data-communication"
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source: "Edzy"
version: 1
last_updated: "2026-06-20"
---

# Data Communication

Data communication refers to the exchange of data between two or more networked devices capable of sending and receiving data over a communication medium, including devices like PCs, mobile phones, and laptops.

---

## Knowledge Snapshot

| Field | Details |
| :--- | :--- |
| Class | Class 12 |
| Subject | Computer Science |
| Book | Computer Science |
| Chapter | Data Communication |
| Pages | 203-222 |

---

## Chapter Summary

### Short Summary
This chapter explores the fundamental aspects of data communication, including its components, capacity measurements, and various communication types and protocols used in data exchange.

### Detailed Summary
The chapter defines data communication and its importance, highlighting the elements involved in communication such as sender, receiver, communication medium, message, and protocols. It also discusses how to measure communication capacity through bandwidth and data transfer rate. Types of data communication, namely simplex, half-duplex, and full-duplex, are explained, along with the principles of circuit switching and packet switching as methods of routing data. The chapter further classifies transmission media into wired and wireless categories, describing various technologies like Bluetooth and Wi-Fi, alongside mobile telecommunication generations that enhance connectivity. Finally, it outlines the necessity and details of different communication protocols such as HTTP, FTP, and TCP/IP that ensure effective data transmission.

---

## Topic-Wise Explanation

### Concept of Communication
Data communication involves the exchange of data, which can be in various forms such as text, images, audio, and more, between connected devices.

### Components of Data Communication
Key components include the sender, receiver, communication medium, the message, and protocols that define rules for communication.

### Measuring Capacity of Communication Media
Capacity is assessed through bandwidth (range of frequencies) and data transfer rate (bits transmitted per second). Bandwidth is measured in Hertz, while data transfer rates are measured in bits per second (bps).

### Types of Data Communication
There are three types: simplex (one-way), half-duplex (two-way but not simultaneous), and full-duplex (two-way and simultaneous communication).

### Switching Techniques
Switching allows multiple devices to communicate without a dedicated path, using circuit or packet switching to route data dynamically.

### Transmission Media
Communication can occur through guided (wired) or unguided (wireless) transmission media, including twisted pair cables, coaxial cables, fiber optic cables, and various wireless technologies.

### Mobile Telecommunication Technologies
Mobile networks have evolved over generations from 1G to 5G, enhancing voice and data services significantly.

### Protocol
Protocols are standardized rules ensuring effective communication between devices, addressing aspects such as flow control and data formatting.

---

## Core Ideas

| Idea | Explanation |
| :--- | :--- |
| Data Communication | Exchange of data between networked devices. |
| Protocols | Rules governing communication between devices. |

---

## Key Concepts

| Concept | Meaning |
| :--- | :--- |
| Bandwidth | Range of frequencies available for transmission. |
| Data Transfer Rate | Amount of data transmitted in a given time. |

---

## Important Points for Revision
* Data is any form of information exchanged between devices.
* Communication requires a sender, receiver, message, medium, and protocols.
* Capacity is measured in bandwidth (Hz) and data transfer rates (bps).
* Types of communication include simplex, half-duplex, and full-duplex.
* Two switching techniques: circuit switching and packet switching.
* Transmission media can be guided (wired) or unguided (wireless).
* Mobile networks have evolved from 1G to 5G, improving connectivity.
* Protocols define how data is sent, received, and acknowledged.

---

## Vocabulary and Glossary

| Word / Phrase | Meaning |
| :--- | :--- |
| Simplex | One-way communication channel. |
| Half-duplex | Two-way communication, not simultaneous. |
| Full-duplex | Two-way communication, simultaneous. |
| Circuit Switching | Dedicated path established for communication. |
| Packet Switching | Data broken into packets sent independently. |

---

## Practice Questions

### Short Answer Questions
1. Define data communication.
2. What are the components of data communication?
3. How is bandwidth measured?
4. What are the types of data communication?
5. Explain circuit switching vs. packet switching.

### Long Answer Questions
1. Discuss the importance of protocols in data communication.
2. Explain the differences between wired and wireless transmission media.
3. Describe the evolution of mobile telecommunication technologies from 1G to 5G.

---

## Related Concepts
* Communication Protocols
* Transmission Media
* Mobile Communication Generations

---

## Source Attribution

| Field | Value |
| :--- | :--- |
| Source | Edzy |
| Reference Type | examSubjectBookChapter |
| Reference ID | 66def9cc3f8b4e9e69bdbe79 |
| Canonical URL | https://www.edzy.ai/cbse-class-12-computer-science-data-communication |
| Markdown URL | https://www.edzy.ai/okf/chapter/cbse-class-12-computer-science-data-communication.md |