What are the 4 traditional main service functions of the Internet?

The Internet has four traditional main service functions: 1. Remote login service Telnet, which is a terminal emulation protocol that provides remote connection services; 2. File transfer service FTP, which allows users to transfer files between computers; 3. E-mail service E-mail; 4. WWW World Wide Web.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

What are the four traditional main service functions of the Internet?

The traditional main service functions of the Internet:

1. Remote login service Telnet (Remote Login)

Remote login is provided by the Internet One of the basic information services is the terminal emulation protocol that provides remote connection services. It allows your computer to log into another computer on the Internet. Your computer becomes a terminal for the computer you log in to, and you can use the resources on that computer, such as printers and disk devices. Telnet provides a large number of commands that can be used to establish an interactive dialogue between the terminal and the remote host, allowing local users to execute commands from the remote host.

2. File transfer service FTP

FTP allows users to transfer files between computers, and the file type is not limited. It can be a text file, a binary executable file, a sound file, Image files, data compression files, etc. FTP is a real-time online service. Before working, you must first log in to the other party's computer. Only after logging in can you perform file search and file transfer related operations. Ordinary FTP services require the corresponding user name and password when logging in. When the user does not know the user name and password of the other party's computer, the FTP service cannot be used. To this end, some information service agencies provide an "anonymous FTP service" in order to facilitate Internet users to use their publicly released information through the network.

3. E-mail service E-mail (Electronic Mail)

E-mail is like a letter from the post office, but the difference is that e-mail is communicated with other users through the Internet. A fast, concise, efficient and cheap modern communication method for contact. And it has many advantages. For example, E-mail is much faster than sending letters through traditional post offices. At the same time, without deliberate damage by hackers, the loss and damage rate of letters is also very small.

4. World Wide Web WWW (World Wide Web)

The Chinese translation of WWW (World Wide Web) is World Wide Web or World Wide Web. WWW was created to solve the problem of information transmission on the Internet. Before the creation of WWW, almost all information was released through E-mail, FTP, Telnet, etc. But because information on the Internet is scattered all over the place, it's impossible to search for the information unless you know where it is. It uses hypertext and multimedia technology to link different documents through keywords, providing a cross-query method. In a hypertext file, a keyword links to another keyword-related file. The file can be on the same host or on another host on the Internet. Similarly, the file can also be on another hypertext file. text file.

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