Acknowledgments

When we wrote the first edition of the CWNA Study Guide, David Coleman's children, Brantley and Carolina, were young teenagers. David would like to thank his now adult children for their years of support and for making their dad very proud. David would also like to thank his mother, Marjorie Barnes, and his stepfather, William Barnes, for many years of support and encouragement.

David Coleman would also like to thank the entire Aerohive Networks training department: Paul Levasseur, Bryan Harkins, Metka Dragos, Gregor Vucajnk, Roslyn Rissler, and Yuki Fraher. We have built a fantastic team! David Coleman would also like to thank Abby Strong and all of his co-workers at Aerohive Networks (www.aerohive.com). It has been one wild ride the past four years!

David Westcott would like to thank his parents, Kathy and George, who have provided so much support and love and from whom he has learned so much. He would also like to thank Janie, Jennifer, and Samantha for their patience and understanding of life on the road and for their support throughout the writing of this book. And special thanks to Savannah Grace, for providing me with the joy of seeing and experiencing life from a new perspective.

David Westcott also would like to thank the training department at Aruba Networks. More than 10 years ago, Chris Leach hired him as a contract trainer. Much has changed over the years, but thanks to Chris, Carolyn Cutler, Susan Wells, Kevin Hamilton, Ramon Pastor, and Stewart Trammell, it has been a fun and exciting journey.

Together, we must first thank Sybex acquisitions editor Jeff Kellum for initially finding us and bringing us to this project. Jeff is an extremely patient and understanding editor who has now survived publishing six books with us. We would also like to thank our development editor, Mary Ellen Schutz. Mary Ellen did a great job keeping us focused and motivated. We also need to send special thanks to our editorial manager, Pete Gaughan; our production editor, Eric Charbonneau; Judy Flynn, our copyeditor; Nancy Bell, our proofreader; and Jack Lewis, our indexer.

We also need to give a big shout-out to our technical editor, Marcus Burton of Ruckus Networks (www.ruckuswireless.com). The feedback and input provided by Marcus was invaluable. Special thanks also goes to Andrew vonNagy of Revolution Wi-Fi (www.revolutionwifi.net) for his feedback and content review. Andrew is a well-known Wi-Fi superstar who writes the best vendor-neutral Wi-Fi blog.

Thanks very much to Matthew Gast for the heartfelt foreword. Matthew, an author himself, has written numerous books about 802.11 technology. A simple Google search on Matthew Gast's name reveals why he is considered an utmost authority on 802.11 technology.

We would also like to thank Brad Crump, Tom Carpenter, and Julia Baldini of the CWNP program (www.cwnp.com). All CWNP employees, past and present, should be proud of the internationally renowned wireless certification program that sets the education standard within the enterprise Wi-Fi industry. It has been a pleasure working with all of you for over a decade.

Andrew Crocker has again provided us with wonderful photographs and some amazing editing of some not so wonderful photographs that we provide him. You can see much more of his work and talent at www.andrew-crocker.com.

Thanks to Proxim and to Ken Ruppel ([email protected]) for allowing us to include the video Beam Patterns and Polarization of Directional Antennas with the book's online resources, which can be accessed at .

Special thanks goes to Andras Szilagyi, not only for creating the EMANIM software program but for all the extra assistance he provided over the past eight years by creating customized versions of the program for the different editions of the book.

We would also like to thank the following individuals and companies for their support and contributions to the book: