As the author himself says: "If you really think of yourself as an “idiot” when it comes to Unix, this book is not for you. Likewise, if you are a network administration “genius,” this book is probably not suitable either. If you fall anywhere between these two extremes, however, you’ll find this book has a lot to offer."
I am a computational scientist, therefore I am somewhere in the middle between the previously mentioned extremes.
This book assumes that you have a good understanding of computers and their operation and that you’re generally familiar with Unix system administration. Many concepts are ordinary knowledge both on everyday computing, and in the realm of duties of a computational scientist with technical duties and hand-on practice.
The concepts are rigorously explained. There are exhaustive examples, accurate schemes, and useful figures.
For me it will be a good reference. If you need some groundings for a collection of protocols used almost 24h/day in our current world, this is the right book to start with.
Definitely good information. Would go back to it if doing this type of work in the future again. Abandoned it as I didn't have time to keep working through it. Maybe in the future if I get back into understanding the depths of the internet!
An old book going back to 1992 in the first edition. Still a must have reference book for anyone in Systems Administration, Networking, or management of Data Centers.