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This article mainly introduces what is the role of TCP port number in the computer, which has certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article. Let the editor take you to know it.

The tcp port number is used to mark the application process. The transport user corresponding to the transport layer is the application process; usually, the transport layer corresponds to multiple application processes, that is, there are multiple processes running in parallel on a host, such as in a multitasking or multi-user multitasking system. The "port number" provided by TCP is used to distinguish these processes.

TCP and UDP provide "port numbers" to identify specific application entities (application processes).

In general, the transport layer corresponds to multiple application processes, that is, there are multiple processes running in parallel on a host, such as in a multitasking or multi-user multitasking system. TCP and UDP provide "port numbers" to distinguish between these processes. Both TCP and UDP have reserved some important port numbers, for example, the port number of HTTP in TCP is 80PowerFTP, and the port number of FTP is 21.

Extended data:

The so-called port is like a house number. The client can find the corresponding server side through the ip address, but the server side has many ports, and each application corresponds to a port number. Only through the port number similar to the house number can the client really access the server. In order to distinguish between ports, each port is numbered, which is the port number.

The main function of a port number is to represent the services provided by a specific process in a computer. The computer in the network represents its identity by IP address, it can only represent a specific computer, but many services can be provided on one computer at the same time, such as database service, FTP service, Web service and so on. We can distinguish these different services provided by the same computer by port number, for example, the common port number 21 represents FTP service. Port number 23 means Telnet service port number 25 refers to SMTP service and so on. The port number is generally used to be a 4-digit integer, and the port number cannot be repeated on the same computer, otherwise there will be an exception such as port number conflict.

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