My first job interview in 1989 after college:
Them: "Do you know TCP/IP?". Me: "Yes". Them: "you're hired"
Job at the Westinghouse instrumenting nuclear power plants. Simpler times then.
"Usually we don't hire people from high school, but you had Common Lisp in your CV, so the engineers said to take you anyway." 2010, still simpler times.
Do you know DNS? How does an HTTPs/SSL handshake work? Man this kid is good hire him. - 2015 era job interview
Same for me in 2006 as a junior Linux sysadmin:
“What does ifconfig do? What does it mean to mount a disk? What editor do you use? You’re hired.”
None of that culture fit nonsense.
Back in 1989 that was a rare skill. Many of the engineers who had experience were working on government projects. I mean TCP barely had congestion control at that point, it was very early days.