Not even getting out of the second chapter I've run across more than a dozen typos and other errors. If I had known there were so many I would have marked them all and sent them to the publisher. Some topics are not even covered. I have thrown this book away and bought the Sybex 70-290 study guide instead...Sybex Study Guides are the best I've found.If you want to learn this information correctly, do NOT use this book. Their technical editor should be fired.