{"id":2083,"date":"2025-09-14T05:41:22","date_gmt":"2025-09-14T05:41:22","guid":{"rendered":"https:\/\/itxperts.co.in\/blog\/?p=2083"},"modified":"2026-01-11T07:17:22","modified_gmt":"2026-01-11T07:17:22","slug":"introduction-to-computer-networks-class-12-ip-notes","status":"publish","type":"post","link":"https:\/\/itxperts.co.in\/blog\/introduction-to-computer-networks-class-12-ip-notes\/","title":{"rendered":"Introduction to Computer Networks \u2013 Class 12 IP Notes"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">1. Introduction to Networks<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Network<\/strong>: A computer network is a collection of two or more interconnected devices (computers, printers, mobiles, servers, etc.) that can communicate and share resources (data, files, hardware, internet).<\/li>\n\n\n\n<li><strong>Need for Networks<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Resource sharing (printers, files, applications).<\/li>\n\n\n\n<li>Communication (email, chat, video conferencing).<\/li>\n\n\n\n<li>Data sharing and remote access.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. Types of Networks<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>PAN (Personal Area Network)<\/strong>\n<ul class=\"wp-block-list\">\n<li>Covers a very small area (a few meters).<\/li>\n\n\n\n<li>Used for connecting personal devices like smartphones, laptops, printers, Bluetooth devices.<\/li>\n\n\n\n<li>Example: Bluetooth or USB tethering.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>LAN (Local Area Network)<\/strong>\n<ul class=\"wp-block-list\">\n<li>Covers a small geographical area (like an office, school, or building).<\/li>\n\n\n\n<li>High speed, inexpensive, privately owned.<\/li>\n\n\n\n<li>Example: Computer lab network in school.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>MAN (Metropolitan Area Network)<\/strong>\n<ul class=\"wp-block-list\">\n<li>Covers a city or a large campus.<\/li>\n\n\n\n<li>Larger than LAN but smaller than WAN.<\/li>\n\n\n\n<li>Example: Cable TV network, city-wide Wi-Fi.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>WAN (Wide Area Network)<\/strong>\n<ul class=\"wp-block-list\">\n<li>Covers a very large geographical area (country, continent, or globe).<\/li>\n\n\n\n<li>Internet is the largest WAN.<\/li>\n\n\n\n<li>Example: Banking network across countries.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. Network Devices<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Modem<\/strong>\n<ul class=\"wp-block-list\">\n<li>Converts digital signals (computer) into analog signals (telephone lines) and vice versa.<\/li>\n\n\n\n<li>Needed for internet connection over telephone lines.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Hub<\/strong>\n<ul class=\"wp-block-list\">\n<li>A simple device that connects multiple computers in a network.<\/li>\n\n\n\n<li>Broadcasts data to all connected devices (less efficient).<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Switch<\/strong>\n<ul class=\"wp-block-list\">\n<li>Smarter than a hub; forwards data only to the intended device (using MAC address).<\/li>\n\n\n\n<li>Improves network efficiency.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Repeater<\/strong>\n<ul class=\"wp-block-list\">\n<li>Amplifies and regenerates signals to extend the distance of a network.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Router<\/strong>\n<ul class=\"wp-block-list\">\n<li>Connects multiple networks (LAN to the internet).<\/li>\n\n\n\n<li>Uses IP addresses to send data to correct destination.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Gateway<\/strong>\n<ul class=\"wp-block-list\">\n<li>Acts as a translator between two different networks using different protocols.<\/li>\n\n\n\n<li>Example: Connecting LAN with mainframe system.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. Network Topologies<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Star Topology<\/strong>\n<ul class=\"wp-block-list\">\n<li>All devices connected to a central hub\/switch.<\/li>\n\n\n\n<li>Easy to add\/remove devices, but if hub fails, whole network fails.<br><\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"873\" src=\"https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-1024x873.png\" alt=\"\" class=\"wp-image-2084\" style=\"width:352px;height:auto\" srcset=\"https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-1024x873.png 1024w, https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-300x256.png 300w, https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-768x655.png 768w, https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image.png 1039w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Bus Topology<\/strong>\n<ul class=\"wp-block-list\">\n<li>All devices connected using a single backbone cable.<\/li>\n\n\n\n<li>Simple and cheap, but backbone failure crashes the entire network.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"873\" src=\"https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-1-1024x873.png\" alt=\"\" class=\"wp-image-2085\" style=\"width:394px;height:auto\" srcset=\"https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-1-1024x873.png 1024w, https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-1-300x256.png 300w, https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-1-768x655.png 768w, https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-1.png 1039w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Tree Topology<\/strong>\n<ul class=\"wp-block-list\">\n<li>Hierarchical structure combining star and bus topology.<\/li>\n\n\n\n<li>Good for large organizations.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"873\" src=\"https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-2-1024x873.png\" alt=\"\" class=\"wp-image-2086\" style=\"width:399px;height:auto\" srcset=\"https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-2-1024x873.png 1024w, https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-2-300x256.png 300w, https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-2-768x655.png 768w, https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-2.png 1039w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Mesh Topology<\/strong>\n<ul class=\"wp-block-list\">\n<li>Every device connected to every other device.<\/li>\n\n\n\n<li>Very reliable (no single point of failure) but expensive.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"873\" src=\"https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-3-1024x873.png\" alt=\"\" class=\"wp-image-2087\" style=\"width:462px;height:auto\" srcset=\"https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-3-1024x873.png 1024w, https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-3-300x256.png 300w, https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-3-768x655.png 768w, https:\/\/itxperts.co.in\/blog\/wp-content\/uploads\/2025\/09\/image-3.png 1039w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. Introduction to Internet<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Internet<\/strong>: A global network of interconnected networks, allowing data communication and resource sharing.<\/li>\n\n\n\n<li><strong>Key Terms<\/strong>:\n<ul class=\"wp-block-list\">\n<li><strong>URL (Uniform Resource Locator)<\/strong>: Address of a resource on the internet (e.g., <code>https:\/\/www.cbse.gov.in<\/code>).<\/li>\n\n\n\n<li><strong>WWW (World Wide Web)<\/strong>: A collection of interlinked hypertext documents accessed via the internet.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>Applications of Internet:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Web<\/strong>: Browsing information on websites.<\/li>\n\n\n\n<li><strong>Email<\/strong>: Sending\/receiving electronic messages.<\/li>\n\n\n\n<li><strong>Chat<\/strong>: Real-time text communication.<\/li>\n\n\n\n<li><strong>VoIP (Voice over Internet Protocol)<\/strong>: Making voice\/video calls over the internet (e.g., WhatsApp, Skype).<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">6. Website<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Website<\/strong>: A collection of related web pages hosted on a web server, accessible via a domain name (e.g., <a href=\"http:\/\/www.itxperts.co.in\/\">www.itxperts.co.in<\/a>).<\/li>\n\n\n\n<li><strong>Webpage<\/strong>: A single document\/page on a website.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Difference between Website and Webpage<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Website<\/th><th>Webpage<\/th><\/tr><\/thead><tbody><tr><td>Collection of related pages<\/td><td>A single page of a website<\/td><\/tr><tr><td>Example: <a href=\"http:\/\/www.wikipedia.org\/\">www.wikipedia.org<\/a><\/td><td>Example: Wikipedia\u2019s \u201cIndia\u201d page<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Static vs Dynamic Webpages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Static Page<\/strong>: Fixed content, same for all users. Example: About Us page.<\/li>\n\n\n\n<li><strong>Dynamic Page<\/strong>: Content changes based on user interaction or database. Example: Facebook feed, Amazon product page.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Web Server and Hosting<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Web Server<\/strong>: A computer that stores websites and delivers them to users on request (e.g., Apache, Nginx).<\/li>\n\n\n\n<li><strong>Web Hosting<\/strong>: Renting space on a server to store a website and make it accessible on the internet.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">7. Web Browsers<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Web Browser<\/strong>: Software used to access and view web pages.<\/li>\n\n\n\n<li><strong>Common Browsers<\/strong>: Google Chrome, Mozilla Firefox, Microsoft Edge, Safari, Opera.<\/li>\n<\/ul>\n\n\n\n<p><strong>Browser Features:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Settings<\/strong> \u2013 Customize homepage, privacy, security, download preferences.<\/li>\n\n\n\n<li><strong>Add-ons &amp; Plug-ins<\/strong> \u2013 Extra tools to enhance functionality (e.g., Ad-blocker, Flash Player, Grammarly).<\/li>\n\n\n\n<li><strong>Cookies<\/strong> \u2013 Small text files stored by websites on user\u2019s computer to remember preferences and track activity.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">\u2705 Summary Points<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Network \u2192 PAN, LAN, MAN, WAN.<\/li>\n\n\n\n<li>Devices \u2192 Modem, Hub, Switch, Repeater, Router, Gateway.<\/li>\n\n\n\n<li>Topologies \u2192 Star, Bus, Tree, Mesh.<\/li>\n\n\n\n<li>Internet \u2192 URL, WWW, Applications (Web, Email, Chat, VoIP).<\/li>\n\n\n\n<li>Website vs Webpage \u2192 Static vs Dynamic.<\/li>\n\n\n\n<li>Web Server &amp; Hosting.<\/li>\n\n\n\n<li>Browsers \u2192 Settings, Add-ons, Plug-ins, Cookies.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Practice Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. Multiple Choice Questions (MCQs)<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Which of the following is the largest network?<br>a) LAN<br>b) MAN<br>c) WAN<br>d) PAN<\/li>\n\n\n\n<li>Which device connects different networks and directs data using IP addresses?<br>a) Hub<br>b) Switch<br>c) Router<br>d) Repeater<\/li>\n\n\n\n<li>Which topology is most reliable but also most expensive?<br>a) Bus<br>b) Star<br>c) Tree<br>d) Mesh<\/li>\n\n\n\n<li>The address <code>https:\/\/www.cbse.gov.in<\/code> is an example of:<br>a) IP Address<br>b) URL<br>c) Domain Name System<br>d) Protocol<\/li>\n\n\n\n<li>Cookies are used to:<br>a) Improve internet speed<br>b) Store user preferences and activity<br>c) Connect networks<br>d) Provide virus protection<\/li>\n<\/ol>\n\n\n\n<p><strong>Answer Key:<\/strong> 1\u2013c, 2\u2013c, 3\u2013d, 4\u2013b, 5\u2013b<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. Very Short Answer Questions (1 Mark)<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Define PAN with an example.<\/li>\n\n\n\n<li>Name any two commonly used web browsers.<\/li>\n\n\n\n<li>What does VoIP stand for?<\/li>\n\n\n\n<li>Write one difference between static and dynamic web pages.<\/li>\n\n\n\n<li>Which device is used to boost network signals?<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. Short Answer Questions (2\u20133 Marks)<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Differentiate between Hub and Switch.<\/li>\n\n\n\n<li>Write two advantages and disadvantages of Bus topology.<\/li>\n\n\n\n<li>What is a Web Server? Give two examples.<\/li>\n\n\n\n<li>Write two differences between a website and a webpage.<\/li>\n\n\n\n<li>Explain any two applications of the internet.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. Long Answer Questions (4\u20135 Marks)<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Explain PAN, LAN, MAN, and WAN with examples.<\/li>\n\n\n\n<li>Discuss different network devices with their functions.<\/li>\n\n\n\n<li>Draw neat diagrams and explain Star, Bus, and Mesh topologies.<\/li>\n\n\n\n<li>What is a website? Explain static and dynamic webpages with suitable examples.<\/li>\n\n\n\n<li>What are web browsers? Explain features like settings, add-ons, plug-ins, and cookies.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>1. Introduction to Networks 2. Types of Networks 3. Network Devices 4. Network Topologies 5. Introduction to Internet Applications of Internet: 6. Website Difference between Website and Webpage Website Webpage Collection of related pages A single page of a website Example: www.wikipedia.org Example: Wikipedia\u2019s \u201cIndia\u201d page Static vs Dynamic Webpages Web Server and Hosting 7. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2088,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"googlesitekit_rrm_CAow44u0DA:productID":"","footnotes":""},"categories":[213],"tags":[24,34,33,231],"class_list":["post-2083","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-informatics-practices","tag-cbse","tag-cs-coaching","tag-ip-coaching","tag-networking"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Introduction to Computer Networks \u2013 Class 12 IP Notes - Itxperts<\/title>\n<meta name=\"description\" content=\"Complete CBSE Class 12 Informatics Practices (IP) Unit 3 Notes on Introduction to Computer Networks. 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