In cmd, the system prompts via telnet that it is not an external or internal command.

In cmd, the system prompts via telnet that the system file is not an external or internal command.
Solution:
First, enable the telnet service Win7 without installing the telnet function by default, so you cannot directly use the telnet command; you can go to "Control Panel"> "program"> "enable or disable Windows functions" and check "telnet client". Then, you can use the telnet command normally. Check the environment variables at www.2cto.com to make sure that the system32 directory is in the directory % SystemRoot % \ system32; % SystemRoot %. If the above two causes are correct, the telnet command may be missing.
C: \ WINDOWS \ system32 \ telnet.exe check whether there is any. If not, copy one to another computer to copy it to the same directory. Author wjlvivid