@Lamont29 is correct that experience is a huge thing.
Another huge thing is thinking like a manager instead of a technician. In Lamont's example, if you resolved the problem by making a configuration change, you are likely the technician. In this case, you need to think about how your boss (or boss's boss) went about solving the problem. This includes things like seeking other people's opinions, gaining consensus on the most appropriate course of action, maintaining the lines of communications with the technicians, customers, IR teams, and other involved parties.
Another trick is if one of the answers is "human life safety", that is the correct answer, almost regardless of the question.