Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Save a tree...don't make another book like this

This book is way vague. No specific examples, mainly lengthy hot air explinations of the theory of NAT. For (price) bucks, I would rather have bought a Cisco specific handbook. If you do NAT at work and need a few pointers and pratical solutions, this book is not for you.If it was on Survivor, it would have been voted off the first day.