First of all, let’s try to understand what is telnet and why is it required.
Telnet is a network protocol used to virtually access a computer and to provide a two-way, collaborative, and text-based communication channel between two machines.
You can install
telnet client in the Linux machine. Crio Workspace is a Linux machine where you can install telnet but due to security reasons installation of external packages is not allowed.
There are more such online
telnet clients. Please feel free to use them if the installation isn’t working for you.