I have taken lot of interviews and guys who are having 3 -5 years experience doesn't know about the basics. One interested answer was being given to me after asking a question about subnetting that I always use subnet calculator. This is really embarrassing that we are claim about our expertise and don't even know basics. So finally I made my mind to teach people not by giving them answers but by giving them questions. Once people read the basic questions then they come to know how much they know.
I would be happy to get your feedback.