Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The book that could have been

First, you should understand that literally half this book is taken up by the text of RFC's that you can already get on the Internet. The rest is taken up by brief introductions to tools such as nmap and Ethereal that are too brief to be really useful. The book shows some examples of iptables but does not explain what is really going on. Skip this one, folks.