Linux Small Knowledge Translation-Protocol (protocol)

"Protocol" is an indispensable concept for understanding servers and networks.

"Agreement (Protocol)" has the meaning of "rules, provisions".

In fact, the function of "protocol" is very wide, in the field of communication, "protocol" provides "in the communication, in what circumstances, in what order, what kind of way to interact with what kind of data".

Abstract to understand the "protocol" may be more difficult, let's give an example below.

The protocol used to interact with HTML over the Web is "http" (Hyper Text Transfer Protocol). The most important thing about this protocol is to specify the rules for HTML interaction between the server and the client.

For example, after the client connects to the server, it sends the

GET/

The Web server then sends the corresponding HTML document to the client.

A series of rules like this is "agreement".

Clearly, such rules are universal on the Internet wherever they are. That is, "agreement" can also be said to be "common rules" (of course, the version of the protocol used may be different).

Then, the various protocols used in Internet communications include:

• "http":html-Mode Interaction Protocol
• "smtp": Protocol to send e-mail
• "ftp": File Transfer Protocol
• "TCP":1 protocol for transmitting data to 1
• "ip": Protocols for transmitting data over the Internet

Wait a minute...

The names of these protocols end with "p", "p" is "protocol", so seeing these names will let people know that this is a protocol.

Sometimes ask "what kind of protocol is used to access Web sites over the Internet", HTTP or TCP or IP? Or the other?

The answer is ... "http,tcp,ip all to use".

In fact, when network communication, not only use one protocol, but the combination of multiple protocols used. It is this easy to lead to the confusion of beginners.