What is the best book to learn network security?


I have basic information about network and I am intending to learn and master network security, so please could any body help me to find the best book which will lead to be a good inspection in network security.

Please, provide link to download the book.

I was trying to download introduction to network security by Douglas, but unfortunately i didn't succeed.

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It depends what kind of security you are interested in. Operating Systems security (Windows,Linux?), network etc... Security is very very big topic. If you are interested in Linux security you have to look on Red Hat Security Specialist certificate and books for that or have a look for some books like this:

There is book about Network security:

You can find a lot of books about security here:

but of course for the best books about security, you must paid and nobody can give you some link to rapidshare here because it is innegal ;)

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Dear nabilhammoud,

please let me strongly recommend to buy/read the excellent book "Protect Your Windows Network: From Perimeter to Data" by Steve Riley and Jesper M. Johansson.
Despite it has "Windows" in the title, this book covers not only Microsoft systems, but is a very good overall explanation of security and includes many references to Pen testing (and especially the dangers of such).
The book is e.g. available from http://www.amazon.co.uk/Protect-Your-Windows-Network-Technology/dp/0321336437

Kind regards,
nabilhammoudAuthor Commented:
ok THX
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