I was lucky enough to work on a migration from BIND 4 (yes, four) to BIND 9 during my training. I have run my own resolver at home ever since and in retrospect

I was lucky enough to work on a migration from BIND 4 (yes, four) to BIND 9 during my training. I have run my own resolver at home ever since and in retrospect learning how DNS works was one of the most interesting things I learned back then. The thing is, when DNS fails for some reason, everything that sits on top fails, too. So as a network admin / sysadmin, it is very helpful to know. Heck, even as regular Internet user, it is helpful.