SW Programming




10-feb-2015 0.39
Netsaver
 
Created using TheBrain.

COMPUTERS CAN BE CONNECTED together on networks. A computer on a network can communicate with other computers on the same network by exchanging data and files or by sending and receiving messages.

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millions of computers throughout the world are connected to a single huge network called the Internet.

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The most basic protocols on the Internet are the Internet Protocol (IP), which specifies how data is to be physically transmitted from one computer to another, and the Transmission Control Protocol (TCP), which ensures that data sent using IP is received in its entirety and without error.

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All communication over the Internet is in the form of packets. A packet consists of some data being sent from one computer to another, along with addressing information that indicates where on the Internet that data is supposed to go.

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Every computer on the Internet has an IP address, a number that identifies it uniquely among all the computers on the net.

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Since people prefer to use names rather than numbers, most computers are also identified by names, called domain names.

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When you use a domain name, your computer sends a message to a domain name server to find out the corresponding IP address. Then, your computer uses the IP address, rather than the domain name, to communicate

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Among the most popular services are instant messaging, file sharing, electronic mail, and the World-Wide Web. Each service has its own protocols, which are used to control transmission of data over the network.

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The World-Wide Web allows you to request pages of information that are stored on computers all over the Internet.

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A computer that stores such pages of information is called a web server. The user interface to the Web is the type of program known as a web browser.

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A web browser is just a user interface to the Web. Behind the scenes, the web browser uses a protocol called HTTP (HyperText Transfer Protocol) to send each page request and to receive the response from the web server.

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