Shulou(Shulou.com)06/01 Report--

We often hear the word port number, but there are still a lot of IT people with professional background who don't know much about what a port is. All right, me, too. Did you take it?

It doesn't matter. I heard it's coming!

For example, if we connect to the server through an IP address, what are we going to do? What kind of service do you want to get? If we need port 80 to access a web page, port 22 is needed to access FTP. Isn't it easy!

Less than 10000 of the ports are for the system's own use, and more than 10000 of the ports are for self-programming.

There are more than 60000 ports in total, and only a few are most commonly used, as shown in the figure:

Note: port 23 of telnet is generally not used because telnet is not secure.

Command to view ports:

Netstat-an

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