IT professionals build, design, and maintain the systems that handle storing, sending, and retrieving information. Employers are looking for individuals who are able to systematically solve the tough and unusual problems that arise in the field. Expect to be asked many hypothetical questions that will assess your thought process when dealing with complex problems.
There is always a stumper question in every interview and I was prepared for most anything except..."what is the greatest technology to come out in the last five years?" Every stumper question I had been asked in the past was in the form of "How would/did you handle...?"