I generally see that sort of questioning as a red flag, but I understand why they want candidates to guess; they want you to speculate because it may reveal mor

I generally see that sort of questioning as a red flag, but I understand why they want candidates to guess; they want you to speculate because it may reveal more about your knowledge base and experience. It's still lousy for them to not take "I don't know" for an answer, and I probably wouldn't return their calls.