Tools/materials: Dell XPS 13-9350-3708, win 10, running window 1.0.

1. First, in the computer, click the Start menu in the lower left corner, then open the run window and enter cmd.

2. After entering the cmd command prompt, enter netstat to check the network monitoring. If the Port Monitor is displayed, the port is open.

3.telnet test can also be judged by telnetxxx port number.

4.telnet test shows different information of different service ports. For example, port 80 can also be tested by telnet.

5, and then how to test the linux system. In addition, for linux systems, such as centos7.3 version 7.3, you can also use netstat-nao to check the port opening.

6. Finally, telnet test can also be used to test the test port of linux platform. In addition, depending on the service where the port is located, you can also use lsof to monitor.