Many certification exams use the technique you describe to really probe exam-takers' knowledge and understanding of the material. This tactic is particularly true when dealing with scenario-based questions. The CISSP exam isn't as tricky in this respect as other exams I've seen, but it's plenty tricky enough. If, however, you avail yourself of some good practice tests and work your way through three or four sets of 250 questions each, you'll be about as ready as anybody can be. Be sure to check out Clement Dupuis' excellent prep site as you work your way into the right state of preparedness for that exam.
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