Linux from the command line -- the first network diagnostic command everyone ever learns -- ping
Of course everyone knows ping and how to operate it in it's default mode, but too many people don't learn it's other capabilities. ping is a powerful network diagnostic tool in it's own right and can be used in a lot of creative ways.
I used to use it with the -c option back in the dial-up days in order to cause the auto-connect system to dial up to our ISP and wait for it to show replies before continuing with cron jobs that required Internet access (eg time sync, system updates, etc.)
https://www.howtoforge.com/linux-ping-command/
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