Eric Seagren 
Secure Your Network for Free [EPUB ebook] 

This is the only book to clearly demonstrate how to get big dollar security for your network using freely available tools. This is a must have book for any company or person with a limited budget.Network security is in a constant struggle for budget to get things done. Upper management wants thing to be secure but doesn’t want to pay for it. With this book as a guide, everyone can get what they want. The examples and information will be of immense value to every small business. It will explain security principles and then demonstrate how to achieve them using only freely available software. – Teachers you how to implement best of breed security using tools for free- Ideal for anyone recomending and implementing new technologies within the company