Excellent Education Technique
I think most of the reviewers here have missed the point by complaining about the multitude of errors in this book! The idea, of course, is to force the reader to work out the contradictions, inconsistencies and outright incorrectness of the questions and answers and thereby encourage a true understanding of the subject. What a great book this really is, it obviously aims to train the reader to deal with the gluttony of misinformation that exits in the "real world". Of course, some readers may want the easy way out and not want to find the secret errors that proliferate throughout this book, but instead want a reference book that will simply, yet comprehensively, explain computer networking fundamentals. For these people, this is NOT the book to buy.