Ask HN: Red Flags for a 1-2 year developer?

I recently had an interview where I was asked a combination of whiteboard problems, and a couple of technical term definitions. Whiteboard wasn't an issue, since I think I kind of understand what I am suppose to do. The technical term definitions caught me off guard, but they would ask me things like what is an index, what is a cookie, what is a join, what is object oriented programming, benefits of these, etc. They also asked me to think in SQL, but I wasn't aware of how to do a problem using a join.

Ideally, I know, I should understand these concepts. I didn't prepare for the interview, and honestly, things went well up until the technical definitions.

But I did freak out a little bit, and feel like I should know these things. I should know what a join is, I should know what a cookie is. And I do, I have a very vague understanding of these things. But in my day to day, I don't do complex joins, I don't have to remember what exactly a header is.

I guess my question is that should I be worried? Or was this simply just a matter of not preparing for my interview like a test?