1) How do you diagnose an issue with something like "cannot log into the domain"? Assume that the network and cables are okay, all other computers are okay, you are allowed to use only this computer, and the issue is only with this computer. Answer: Login to the computer locally and check ipconfig /all. 2) A client needs to get something printed and he is five minutes late but the printer doesn't work. How do you assist this client? Do not think too hard about this. 9 out of 10 non-IT people get this right, but 9 out of 10 IT people have non-optimal solutions.
