"Port" is the free translation of the English port, which can be considered as the outlet for communication between the device and the outside world. Ports can be divided into virtual ports and physical ports. Virtual ports refer to ports inside a computer or a switch router and are invisible.

For example, port 80, port 21, port 23, etc. in the computer. Physical ports, also known as interfaces, are visible ports, such as RJ45 network ports on computer backplanes, RJ45 ports on switches, routers, hubs, etc. Phones using RJ11 sockets also fall into the category of physical ports.

Category:

1. Hardware port

CPU transfers data with peripherals through interface registers or specific circuits. These registers or specific circuits are called ports. .

2. Network port

In network technology, port has several meanings. The ports of hubs, switches, and routers refer to the interfaces connected to other network devices, such as RJ-45 ports, Serial ports, etc. The port we are referring to here does not refer to the port in the physical sense, but specifically refers to the port in the TCP/IP protocol, which is the port in the logical sense.

3. Software port

Buffer.

Extended information:

Illegal intrusion of ports:

1. Scan the port and invade the host through known system bugs.

2. Plant a Trojan and use the backdoor opened by the Trojan to enter the host.

3. Use data overflow to force the host to provide a backdoor to enter the host.

4. Take advantage of vulnerabilities in certain software designs to directly or indirectly control the host.

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