More specifically, I want to know whether I should ask for answers to 2 types of questions:
Questions that the interviewer likely has answers (e.g. how do you explain concept X to a non-technical person?).
Questions that the interviewer likely doesn't have answers (e.g. do you know how this new technology X will benefit us?).
Can I say something like "I don't really know the answer. Can you share with me how you would approach this"?
I'm aware of this question:
But the answers there just suggest the candidate to admit their limitations and try to answer if possible. I want to know whether I should ask the interviewer the answer before moving on to the next question (and if yes, how often can I do it during the interview).