Oh, yes. I've been on the interviewer side of the table myself. It makes me appreciate that I was smart enough to build myself a SOHO and actually work things through when I was studying for my certs.
Of course, coming from a retail background, I had a lot more to prove than a lot of people who were already in IT. @=)
I've actually stumped people with simple backup & restore questions of all things. You'd think *that* particular subject matter would be basic to everyone's DBA knowledge.