As you may know , telnet is not secure ,so it’s not enabled by default, if you issue a telnet command you will get error like “‘telnet’ is not recognized …” error.

Although it’s not recommended to use telnet , but for some senarios we still need to use it , like using “telnet host port” to check if remote port is listening or not.

To enable telnet just search “turn” from your start menu

Then click “Turn Windows features on or off”, then in the poped out window ,tick “Telnet Client” then click “Ok”, telnet will be enabled soon