About Book: 

     You hold in your hands a testimony to the practice and passion of a multitude of hearts. Network security in an incredibly complicated and vast topic area, which is why it was unthinkable to imagine that three authors could effectively write on all the critical issues associated with it. We went beyond ourselves and enlisted the best and to network security: the book you go to first, the one you trust. We’ve taken this opportunity to present realistic and useful information of the most relevant topics that IT professionals face every day. We wish with our very being that we could impart to you all the knowledge that we have gained through study, through experiment, and through practical responses to the realities of defending real-world network, yet we know that such information transfer might not even be possible in a 15-volume set.