Nessus, Snort, and Ethereal Power Tools: Customizing Open Source Security Applications 1st Edition

Didn't help at all. I do not recomend this book.

Outdated information. This was written when Nessus was free. Does not contain information regarding writing scripts to run in Nessus either.

Very in-depth, however, not for someone who is just starting out on Snort, Nessus, or Ethereal. New to Snort, Nessus, or Ethereal - Buy something else. Expert on Snort, Nessus, or Ethereal already? - good book.

Although this is a good book with valuable information, I think it is a bit vague and short. A good idea is to get 3 different books on their respective topics. Nessus and snort have nothing to do with eachother and snort is more powerful than Ethereal. Its work buying if you have the money and has some decent tips and tricks.