What is internet ? Explain applications of Internet.Ripunjay Tiwari
Ans. Internet is a world wide computer network which is made up of thousands of networks that enables communications among 10s of millions of computers. From the point of view of internetworking, it is amazing that no one is in overall charge of the Internet. Although many standard firms have developed technical aspects of this network, no government body has global control. Internet backbone is owned by several companies which are located in all corners of the world.
Actually, Internet is a network medium and not a service. This means that Internet is an information highway which enables software applications to run over it. Internet can be accessed by entities ranging from big firms (e.g., corporations, universities, governments and research institutes) to home users, Normally. Larger firms access the Internet a router which interconnects their internet LAN with leased high-capacity transmission lines. Through a dial-up modem which connects to an Internet service provider (ISP) through standard local telephone lines, small business and home users access the Internet. Then ISP provides the interconnection to the Internet through high-capacity transmission lines which it either owns or leases.
Many networks which make up the Internet itself are run by network service providers (NSPs). NSP buys or leases transmission facilities consisting of wireless links, satellite links, copper wires or optical fiber cables such as cable plant operators, telecommunication companies and wireless communication which own transmission facilities. High-speed Internet access is offered by NSPs by selling bandwidth and network connectivity to ISPs. Commonly, NSPs are known as backbone providers because they offer direct access to the Internet backbone and the network access points (NAPs).
An example of the internetwork path is shown in fig. 5.21., in which a message might follow in a user-to-user message exchange. It is assumed that the sender is located in a small business. Hence, at that end the user connection is done through a modem to a local ISP via standard telephone lines. A network service provider through leased wire or wireless lines is connected by ISP from local telephone companies. Message is inserted by the NSP onto the Internet, where it may traverse many links or routers before reaching another NSP at the receiving end. When the message recipient is situated in a large organization, the message will travel from the NSP to an extennal router and then goes through the LAN of the organization to the recipient.
By means of the world wide web (WWW), which is popularly known as the web, Internet users have access to a wide variety of services. Web is software application which easily enables almost anyone to publish and browse hypertext documents on the internet. Web pages are known as hypertext which have hyperlinks that. When selected will result the web browser to retrieve and display another web page or graphic. There are chat sessions among the web-based services between interest-group members, web-based electronic learning, interactive collaboration between widely dispersed research organization, multimedia entertainment and shopping opportunities. Electronic mail(e-mail) and file transfer capabilities via the file transfer protocol (FTP) are other applications which use the internet as a transports mechanism.
Applications of Internet – Some of the applications of Internet are –
- E-mail – E-mail (Electronic mail) allows the users to send and receive messages and data through the Internet.
- FTP – FTP (file Transfer Protocol) is a protocol (or set of rules) that enables files to transfer from one computer to another. The files available for FTP are stored on FTP servers. FTP client is an interface, allows users to locate files to be transferred and initiate the transfer process.
- WWW – WWW (World Wide Web ) is a system based on hypertext or HTTP, to protocol, organize, and access a wide variety of resources that are available on Internet.
- Telnet – It is a protocol, enables one computer to establish a connection to another computer. The computer establishing connection is referred as local computer, the computer accepting connection is referred as remote or host computer.
- Mailing Lists – It enables groups of people to conduct group conversations by e-mail and provides a way of distributing news letters by e-mail.