Port type:
TCP port and UDP port. Because TCP and UDP are independent, their respective port numbers are also independent of each other. For example, TCP has 235 ports, and UDP can also have 235 ports. There is no conflict between them.
1. well-known port
Well-known ports are well-known port numbers ranging from 0 to 1023, of which 80 ports are allocated to WWW service and 2 1 ports are allocated to FTP service. We don't need to specify the port number when we enter the URL in the address bar of IE, because by default, the port of WWW service is "80".
Network services can use other port numbers. If it is not the default port number, you should specify the port number in the address bar by adding a colon ":"(half angle) after the address and then adding the port number. For example, if you use "8080" as the port of WWW service, you need to enter "URL: 8080" in the address bar.
However, some system protocols use fixed port numbers and cannot be changed. For example, port 139 is specially used for communication between NetBIOS and TCP/IP and cannot be changed manually.
2. Dynamic port
The range of dynamic ports is from 49 152 to 65535. It is called a dynamic port because it generally does not allocate a service fixedly, but dynamically.
3. Register the port
Ports 1024 to 49 15 1 are assigned to user processes or applications. These processes are mainly applications that some users choose to install, rather than common programs that are assigned recognizable ports. When these ports are not occupied by server resources, clients can dynamically select them as source ports.
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