The basic concept of the system and the Internet

Worldwide network of Internet consists of several systems, which can operate either together or independently of each other. A detailed discussion of these systems.

World Wide Web (WWW – literally translated as the World Wide Web) – a global system of hypertext documents related electronic links.

WWW allows you to navigate between documents using hyperlinks, and geographical location of computers on which information is stored, does not matter.

Hyperlink - an electronic link to the document that binds it to another document.

To view hypertext documents using special programs – browsers. browser - is an intelligent program which itself determines the type of viewing hypertext. Therefore, depending on various conditions the same hypertext document in the browser may appear to be different.

E-mail (E-mail) – a system of electronic messages between computers.

When using e-mail for each subscriber must have a unique email address, for example, master @ Primer. RU . A mail address consists of the following elements:

master - the name of the subscriber @ - determinant mail address in Internet; - name of the server on which the “mailbox” user.

FTP (File Transfer Protocol – File Transfer Protocol) – a system that allows you to copy files to the computer from any other computer connected to the Internet. FTP-servers are like directories containing thousands of files with a variety of information, including software, sound files, images, video, etc.

TCP / IP (Transmission Control Protocol / Internet Protocol – Transmission Control Protocol / Internet Protocol) – provides delivery to the address, the so-called packets.

The meaning of the network packet is that any message sent on the Internet, is divided into packets, ie into several messages. Then, these packets are transmitted over the network desired destination. And each packet can be transmitted in its own way, does not coincide with the ways of the other packages. In the final destination of the packets going in the original post. If a packet is lost on the way, then there is a retransmission of the packet, and not entirely the whole message.

Defined action is called packet-switched network. Through the use of packet switching is achieved by the high reliability of the Internet. Because if a communication line fails or its failure, then sent packets still reach their goal. They simply bypass the faulty parts of the network on a different path.

HTTP (HyperText Transport Protocol) – Hypertext Transfer Protocol. Is a way to hypertext pages on the World Wide Web from the server to the viewer browser.

IP Address - the address that identifies a computer on the Internet. Usually written as four numbers separated by periods, for example, This number can be permanently listed on the computer, or automatically assigned each time you connect to the Internet. For example, the servers of large organizations have a permanent address in the Internet. If the computer connects to the Internet via a phone line and a modem, then it is usually every time the power is assigned to the new address.

DNS (Domain Name System) – this is the domain name system, which is distributed over the Internet set of tables representing the numeric IP-addresses of the computers in a user-friendly format. In other words, DNS converts the numeric address of the computer to text (or name). For example, the address of type in the domain name can be displayed as

In the Internet there are special programs - the name servers (name servers), which contain tabular numeric IP-addresses of the computers, symbolic addresses and additional information. When a user submits a text web address of your computer, this information is received by the server names. The server converts the computer name into a numeric IP-address. And then you find the computer is on the network via its IP-address.

URL (Uniform Resource Location – uniform resource locator) – provides a uniform description of the allocation of resources in the Internet.

General view of the address of the resource in the network is as follows:

protocol :/ / server / path / filename

HTML (HyperText Mark-Up Language – HyperText Markup Language) – is formatting language that describes how the page will look with hypertext, when it is viewed in a browser. HTML-document is the text that are special codes - tags . These codes determine how the document will look in a browser window. When the browser opens the HTML-document (ie a document in the form of hypertext), it “reads” tags. And depending on the Tag Browser is a document exactly as it appears on the screen.

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