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Grade XII Informatics Practices
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Ch-5 Internet and Web
School Revise · Class 12 Information Practices · Chapter 5
Internet and Web
Code 065, Class 12. Networks connect computers and the internet connects the world. Here we meet network types and devices, and how the web works.
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What this chapter is about
A network joins computers to share data. The internet is the biggest network, and the web is the pages we view on it.
1. Types of network and devices
A PAN is personal, a LAN covers a small area, a MAN a city and a WAN a large area. Devices include the modem, hub, switch, repeater, router and gateway.
2. Topologies
A topology is the shape of a network: star, bus, tree or mesh.
3. The internet and the web
The internet is a global network. The World Wide Web (WWW) is the pages on it, reached by a URL. A website is a set of web pages; a page can be static (fixed) or dynamic (changing). A web server hosts a site and a browser displays it.
Practise with the interactive
Explore the idea by tapping. The interactive opens right here in the lesson.
Practice set A, multiple choice
1. A network covering a city is a …
MAN.
2. Which device joins two networks?
A router.
3. The pages on the internet are called the …
World Wide Web (WWW).
4. The address of a web page is its …
URL.
Practice set B, short answer
1. Expand PAN, LAN, MAN and WAN.
Personal, Local, Metropolitan and Wide Area Network.
2. Name any two network topologies.
Star, bus, tree or mesh. [any two]
3. What is the difference between a website and a web page?
A website is a set of web pages; a web page is one page of it.
Quick summary
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A network joins computers; by size they are PAN, LAN, MAN and WAN. Devices include modem, hub, switch, repeater, router and gateway. A topology (star, bus, tree, mesh) is the network shape. The internet is the global network and the WWW is its pages, reached by a URL. A website is a set of web pages (static or dynamic), hosted on a web server and shown by a browser. |
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These free Class 12 Informatics Practices notes explain the internet and web, network types PAN LAN MAN and WAN, network devices and topologies, the WWW, URLs and websites with clear examples and practice, for CBSE students across India and the Gulf including the UAE, Saudi Arabia, Qatar, Oman, Kuwait and Bahrain.
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