Instruct: Classify a review as either positive or negative.
Query: Times have changed ....

Since the CCIE R & S lab changed in January, lots of things in this book are no longer on the current exam. That includes Voice over IP, ATM, DLSW and ISDN. Given that most people don't have ATM switches or ISDN simulators in their home labs anyway, that makes a good bit of this book no longer relevent to exam prep. Pretty expensive renting an on-line rack to practice technologies not on the exam any more. It would be alot of work to re-write the labs yourself to take out the stuff no longer tested. For example, you could replace ATM pvcs with frame relay pvcs, but then you would need to redefine the solutions yourself,also.