Basic troubleshooting with telnet and netcat
In the early years of computing,
was used to connect to the command line on remote systems. SSH has
telnet for remote access needs, and these days when you
telnet, it is usually when somebody is using the client
as a generic network troubleshooting tool.
That’s because, in troubleshooting sessions, sysadmins turn to
test connectivity to service offerings.
Source: Basic troubleshooting with telnet and netcat,
an article by Dustin Minnich.
Coincidentally, today I used
nc because macOS Mojave doesn't come
telnet out of the box.