Question
Explain the architecture and working of the Internet. Discuss the role of web browsers,
search engines, and Internet protocols (HTTP, HTTPS, FTP, and SMTP) in accessing
and exchanging information over the Internet. Illustrate your answer with suitable
diagrams and examples.
Answer :
Word Count : 962
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Skip in 10
The Internet is a global network of interconnected computer networks that enables communication and information exchange among billions of devices worldwide. It is based on the TCP/IP protocol suite and follows a distributed architecture where no single organization controls the entire network. The Internet allows users to access websites, send emails, transfer files, stream multimedia, and use numerous online services. Its architecture is designed to ensure scalability, reliability, and efficient data communication across different geographical regions. The Internet architecture mainly consists of end-user devices, local networks, Internet Service Providers (ISPs), backbone networks, servers, routers, and communication protocols. End-user devices such as computers, smartphones, and tablets connect to local networks through wired or wireless technologies. These local networks are connected to ISPs, which provide access to the global Internet. High-speed backbone networks interconnect multiple ISPs and data centers across countries. Routers determine the best path for forwarding data packets between source and destination. Servers host websites, databases, applications, and multimedia content that users access through the Internet. A simplified architecture of the Internet is shown below: ```text +---------+ +------+ +---------+ +---------+ | Client | ---> | ISP | ---> | Internet| ---> | Web | |Computer | | | | Backbone| | Server | +---------+ +------+ +---------+ +---------+ ``` The working of the Internet begins when a user enters the address of a website in a web browser. The browser first contacts the Domain Name System (DNS) server to translate the domain name into an IP address. After obtaining the IP address, the browser sends an HTTP or HTTPS request to the destination server. The request is divided into small packets that travel through different routers across the Internet. The server processes the request and sends the required webpage back as packets. The browser receives these packets, reassembles them, interprets HTML, CSS, JavaScript, images, audio, and video files, and displays the webpage to the user. The sequence of
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