Question: how do you respond when you don't know the answer to an interview question?
Answer: Calm down. First of all, the most important thing to do is stay calm. ...  Don't say, "I don't know," off the bat. ...  Ask questions. ...  Tell your interviewer what you do know. ...  Tell them how you would find the answer. ...  Know the right time to come clean. ...  Send a follow-up email.