Obviously, the only way to pass any exam is to select enough of the right answers to obtain a passing score. However, Cisco's exams are not standardized like the SAT and GRE exams are; they are far more diabolical and convoluted. In some cases, questions are strangely worded, and deciphering them can be a real challenge. In those cases, you might need to rely on answer- elimination skills. Almost always, at least one answer out of the possible choices for a question can be eliminated immediately because it matches one of these conditions:
After you eliminate all answers that are obviously wrong, you can apply your retained knowledge to eliminate further answers. Look for items that sound correct but refer to actions, commands, or features that are not present or not available in the situation the question describes.
If you're still faced with a blind guess among two or more potentially correct answers, reread the question. Try to picture how each of the possible remaining answers would alter the situation. Be especially sensitive to terminology ; sometimes the choice of words ("remove" instead of "disable") can make the difference between a right answer and a wrong one.
Only when you've exhausted your ability to eliminate answers but remain unclear about which of the remaining possibilities is correct should you guess at an answer. An unanswered question offers you no points, but guessing gives you at least some chance of getting a question right; just don't be too hasty when making a blind guess.