Class 12 Informatics Practices Chapter 5 NCERT Book PDF

The NCERT Class 12 Informatics Practices Chapter 5 Introduction to Computer Networks Book PDF gives students the official 2026-27 chapter on networks, Internet services and web basics. Keep this PDF open while revising LAN, MAN, WAN, topologies, network devices, URLs, DNS and common Internet protocols.

• PDF size: 30 official NCERT pages for classroom reading and offline revision.
• Core focus: network types, devices, topologies, Internet, website, web page, server and browser.
• Best use: revise each definition with one example from the NCERT chapter.

This Collegedunia page follows the 2026-27 NCERT Informatics Practices textbook and keeps the official Chapter 5 PDF, networking terms and related study links in one place.

Introduction to Computer Networks Chapter 5 Highlights

Chapter 5 opens with the idea that a network connects devices so they can share data and resources. NCERT then moves from small local networks to the Internet, which is the widest example of connected networks.

Most questions from this chapter ask for definitions, differences and examples. Students should practise writing the exact term first, then the explanation.

Introduction to Computer Networks Video for Class 12

Source: Magnet Brains on YouTube

LAN MAN and WAN in Introduction to Computer Networks

The three network types are best revised by area. LAN covers a room, lab, building or campus. MAN connects networks across a city. WAN connects computers across large regions, and the Internet is the best example.

• LAN is usually fast because devices are close to each other.
• MAN joins many LANs inside one city or large campus area.
• WAN covers countries or continents and uses public or private links.
• Write one example with every type to make the answer complete.

Network Devices and Topologies in the NCERT Book PDF

NCERT explains network devices through their use. A modem connects a computer to an Internet line. A switch connects devices inside a network. A router sends data packets between networks.

For topology questions, compare the arrangement of devices. Bus, star, tree, mesh and ring topologies differ in cable use, fault handling and cost.

How Data Packets Move Through a Network

In a network, data does not always travel as one large block. It is divided into smaller packets. These packets move through devices and are rebuilt at the receiving end.

1. Sender creates data: the device prepares a message, file or web request.
2. Data becomes packets: smaller parts make transfer easier.
3. Devices guide packets: switches and routers move them to the right path.
4. Receiver rebuilds data: packets are arranged back into the message.

Internet Website Web Page and DNS Terms

The second half of the chapter connects networking with daily Internet use. Students should keep the terms separate because many short questions use similar words.

• Internet: a global network of networks.
• Website: a collection of linked web pages under one address.
• Web page: one document displayed by a browser.
• Web server: the computer that stores and serves web pages.
• DNS: changes a domain name into the matching IP address.

Revision tip: write URL and domain-name examples from websites you already use. Real examples make the definitions easier to remember.

How to Use the Chapter 5 NCERT Book PDF

Use this PDF as a definition bank and a diagram-revision file. Read one sub-topic, close the PDF and write the definition in two lines. Then reopen the PDF and fix missing words.

• Make a table for LAN, MAN and WAN with range and example.
• Draw one topology diagram every day for five days.
• Revise network devices by writing one job per device.
• Practise DNS, URL, website and web page as separate terms.

Related Class 12 Informatics Practices Resources

All Informatics Practices NCERT Book PDFs