This book helped me out a lot in troubleshooting my networks and trying to figure out what was wrong with it. I had switches and hubs cascaded too many times, bad network interface cards that were causing broadcast storms, i had a hacker that was sitting on a pc he took control of. and i figure it all out with the book by RB. i was able to analyze each traffic segment and immediately recognized what type of traffic was being sent across the network. i was even able to decipher spoofed ip addresses created by the hacker. this book is amazing!