Acknowledgments

Creating a book of this breadth and depth would not have been possible without the support of our colleagues, families, and friends. We would like to express our humble thanks to the individuals who helped make this book a reality.

Our acquisitions editor, Linda Harrison, and our development editor, Songlin Qiu, have meticulously guided us through the process of creating and revising this book. They, and the staff at Sams Publishing, have been wonderful partners in this venture.

This edition's technical editors, Todd Chapman, Anton Chuvakin, Dan Goldberg, and John Spangler, have carefully examined each chapter's draft to ensure the accuracy of the book's content. We thank them for the time they've devoted to the project, and for the expertise they've loaned to this book.

We also thank our coauthors and technical editors who played a major role in creating the previous edition of this book. Their expertise, thoughtfulness, and attention to detail have already assisted thousands of readers in protecting their network's perimeter.

First edition contributing authors:

Brent Deterding

Mark Edmead

Dr. Neil F. Johnson

Brian O'Berry

Daniel Martin

First edition technical editors:

Bill Bauer

Sam Campbell

Clement Dupuis

Jeff Stevenson

Sergei Ledovskjj

Lastly, we thank our families and friends for their incredible patience while we worked on this project. Their support, love, and understanding helped make this book possible.