I recently bought this book believing several recent 5 STAR reviews. I thought these were reviews from recent test takers. I just completed chapter 5 and so far have found this book to be very confusing with lot of errors. This book appear to be written by people who lack the technical depth in Remote Access. Anytime the book tries to explain technical details such as call setup procedure, it gets very confusing. I have had to refer to CCO publications to understand majority of technical explanations so far. I recommend a differnt book.