The word port has many meanings in English, among which in the field of computer network, it is used to indicate the connection point of receiving and sending data on a device. In a computer system, a device usually has multiple ports, and each port has a unique digital identification called port number. These port numbers are used to distinguish different network connections and communication services.
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In the TCP/IP protocol stack, there are two types of ports: TCP port and UDP port. TCP ports are identified by 16 digits, and UDP ports are also identified by 16 digits. These port numbers play a very important role in network communication. They enable different computer programs to communicate on the network.
1, port may come from French or Portuguese.
The English translation of port may come from French or Portuguese, which means port and harbor. In the field of navigation, this term refers to the place where ships can dock for loading and unloading goods and getting on and off passengers.
2. Computer network field
In the field of computer network, the extended meaning of the word port refers to the connection point on the device that can receive and send data. Generally speaking, the English word "port" has different meanings and usages in different fields, but in the field of computer network, port stands for the connection point on the equipment, which is used for network communication.
3, the export of communication with the outside world
Port is a free translation of English port, which can be regarded as the exit of communication between equipment and the outside world. Ports can be divided into virtual ports and physical ports, where virtual ports refer to the ports inside the computer or in the switch router and are invisible.
Such as port 80, port 2 1, port 23, etc. Physical ports, also known as interfaces, are visible ports, RJ45 network ports on the computer backplane and RJ45 ports, such as switch router hubs. Phones using RJ 1 1 jack also belong to the category of physical ports.