I give this book 5 stars! I've picked up quite a few certification books and this was one of those which didn't put me to sleep. I found it explained concepts fairly well, especially the IP address section, and many of the questions at the end of the chapter were taken straight from the exam as if it was written by Comptia themselves. Because it was only 288 pages I only needed 3 days to read through it, and passed the exam with no prior hands on Networking experience. A must buy if you want to quickly get your Network+ certification.