I don't think the question as phrased is about having a basic idea of how multiprocessor systems work. It's a question about naming(!) of the component parts of a specific protocol. That's trivia. It's as if the question about the TLB was about the acronym rather than the function.

(So what's a good question to see if somebody understands cache coherency? Maybe describing a problem caused by cache-line contention, and asking for an explanation and fix to it?)