Introduction

The World Wide Web has transformed the way we access and share information. It has become an integral part of our daily lives, allowing us to connect, communicate, and explore a vast digital landscape. In this article, we will explore the concepts of web browsers, search engines, and the roles of HTTP and FTP in the World Wide Web.

(a) What is a Web Browser?

A web browser is a software application that enables users to access and view websites on the internet. It acts as a gateway, providing a user-friendly interface to interact with various online resources, such as web pages, images, videos, and documents. A web browser interprets and renders HTML (Hypertext Markup Language), CSS (Cascading Style Sheets), and JavaScript to display web content properly.

Example: Let’s say you want to read an article on your favorite news website. You would open a web browser and type in the website’s address or click on a bookmark. The web browser would then request the web page from the server and render it on your screen, allowing you to read the article, view images, or watch videos embedded within the page.

There are several popular web browsers available today, catering to different platforms and user preferences. Here are some widely used web browsers:

  1. Google Chrome: Known for its speed, simplicity, and extensive customization options, Google Chrome has gained immense popularity. It offers a seamless browsing experience and supports various platforms, including Windows, macOS, and mobile devices.
  2. Mozilla Firefox: An open-source browser that emphasizes privacy and security while offering a wide range of add-ons and extensions. Firefox is known for its robustness, speed, and compatibility with multiple operating systems.
  3. Microsoft Edge: Developed by Microsoft, Edge provides seamless integration with Windows systems. It offers features like a built-in PDF reader, Cortana integration, and improved performance compared to its predecessor, Internet Explorer.
  4. Apple Safari: Safari is the default web browser for Apple devices, such as iPhones, iPads, and Mac computers. It offers excellent performance and compatibility with the macOS and iOS ecosystem.

(b) How Does a Search Engine Work?

Search engines play a crucial role in helping users find relevant information on the internet. They utilize complex algorithms to crawl, index, and rank web pages based on various factors. Let’s explore the process in more detail:

  1. Crawling: Search engines employ automated programs called “spiders” or “crawlers” to explore the web. These bots start by visiting a few known web pages and then follow links to discover new pages. They gather data about the content they encounter, including text, images, and links.
  2. Indexing: After crawling web pages, search engines store and organize the collected information in a massive database called an index. This index allows for quick retrieval of relevant results when a user performs a search query.

Example: Suppose you’re looking for information about the latest smartphones. You type a query like “best smartphones 2023” into a search engine. The search engine analyzes its index, which contains information about numerous web pages, and identifies the ones most relevant to your query.

  1. Ranking and Displaying Search Results: Once the search engine identifies relevant web pages, it applies ranking algorithms to determine the order in which the results are displayed. These algorithms consider various factors, such as relevance, authority, user experience, and the quality of the content.

Example: After analyzing the index, the search engine ranks the web pages based on their perceived relevance and quality. It then displays a list of search results, typically starting with the most relevant and authoritative pages. The user can click on a result to visit the respective web page and access the desired information.

(c) Role Of HTTP and FTP

The Role of HTTP

HTTP, which stands for Hypertext Transfer Protocol, serves as the foundation of communication on the World Wide Web. It is an application-layer protocol that enables the exchange of information between web browsers and web servers. Let’s explore its role in more detail:

  1. Definition and Importance: HTTP defines the structure and format for requesting and responding to web content. It facilitates the seamless transfer of hypertext, which includes text, images, videos, and links. HTTP is crucial for accessing and retrieving web pages, making it a fundamental component of the World Wide Web.

Example: When you click on a link or enter a URL in your web browser, it sends an HTTP request to the web server hosting the desired web page. The server processes the request and sends back an HTTP response containing the requested web page. The web browser then renders the page and displays it on your screen.

  1. Basic Working Principle: HTTP follows a client-server model, where the web browser acts as the client, and the web server fulfills client requests. The communication between the client and the server occurs via HTTP messages, which consist of a request and a response.

Example: Let’s say you want to purchase a book from an online store. You visit the store’s website and add the book to your shopping cart. When you proceed to checkout, your web browser sends an HTTP request to the store’s web server, requesting the purchase transaction. The server processes the request, verifies the payment, and sends back an HTTP response confirming the transaction. The entire process relies on the proper functioning of HTTP.

The Role of FTP

FTP, which stands for File Transfer Protocol, is another essential component of the World Wide Web. It is a standard network protocol used for transferring files between computers over a network. Let’s explore its role in more detail:

  1. Definition and Significance: FTP enables the seamless transfer of files between a client and a server on the internet. It provides a simple and efficient way to upload, download, and manage files remotely. FTP has been widely used for many years, although alternative protocols have gained popularity for certain file transfer scenarios.

Example: Suppose you’re a web developer working on a new website. You have finished designing the web pages on your local computer and need to upload them to a web server for them to be accessible on the internet. You can use an FTP client software to establish a connection with the server and transfer the files to the appropriate directory.

  1. File Transfer Process: FTP operates on a client-server model similar to HTTP. The client initiates a connection with the server and uses FTP commands to perform file transfer operations.

Example: Let’s continue with the web development scenario. After establishing an FTP connection with the web server, you can use FTP commands to upload your web pages, images, and other assets to the server. You can also download files from the server to your local computer for backup or further editing.


ITM-2022

Q.1

what is the Internet? Distinguish between Internet and Intranet and describe the working of internet with the description of following:

(a) End systems and routers.

(b) Backbone and Access Network.

(c) ISP.

Q.2

Answer the following in brief:

(a) How are Internet addresses organized?

(b) What are the various modes of connecting to the By Internet?

(c) How is the purpose of DNS in the Internet?

Q.3

Answer the following questions in the context of World Wide Web:

(a) What is a Web browser? Name some popular Web browsers.

(b) How does a search engine work?

(c) What is the role of HTTP and FTP?

Q.4

(a) Sketch the TCP/IP model and give a brief description of its core protocols.

(b) Describe HTML documents in terms of its elements and specify the basic structure of an HTML document. How are links created in HTML?

Q.5

What are the various components of E-mail architecture? Describe how an e-mail system works? Describe the purpose of MIME in an e-mail system.

Q.6

(a) What can you do with the help of β€˜Forms’ and β€˜Frames’ in HTML? Explain the various elements of a Form with examples.

(b) Give an overview of Java Script along with its advantages. Give a brief description of Java Script development tools.

Q.7

Answer the following questions in brief:

(a) Give an introduction of Web Servers and name some popular web servers.

(b) Describe the access and usage of any one of the web servers.

(c) What is the purpose of Intrusion detection system?

Q.8

(a) Describe the threats and attacks to which the Internet may be vulnerable.

(b) What is the role of encryption, digital signature and firewalls in the context of network security?

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