While it's not all encompassing, I recommend it to round off any juniper firewall reference library.OK book based on the lack of alternativesThis book broadly covers the Juniper NetScreen and SSG firewalls. Having worked with the Juniper devices over the past few months and through reading this book it is obvious that there should have been a bit more attention paid to the editing as there are sentances and examples with the wrong words used. This book will be useful only if you want to gain a general understanding on how netscreen firewalls work, but under no circumstance this should be considered a technical reference, or configuration guide. A Golden OpportunityReally good Juniper Networks security documentation is still lacking and the free info is typically better.