When we wrote the first edition of the CWNA Study Guide, David Coleman's children, Brantley and Carolina, were young teenagers. Carolina now holds a master's degree in public policy from the University of Southern California (USC). Brantley graduated from Boston University and recently earned his Ph.D. in biochemistry at the University of Washington. David would like to thank his now adult children for years of support and for making their dad very proud. David would also like to thank his mother, Marjorie Barnes, stepfather, William Barnes, and brother, Rob Coleman, for many years of support and encouragement. David also thanks Valla Ann for being so special and making him laugh sideways.
David Coleman would also like to thank his friends and family at Aerohive Networks (www.aerohive.com). There are many past and present Aerohive employees he would like to thank, but there simply is not enough room. So thank you to all of his Aerohive co-workers. It has been one wild ride the past nine years!
David Westcott would like to thank Janie and Savannah for the smiles and hugs he receives when arriving home after being away delivering a training class. He would also like to thank Janie for her patience and understanding of his travel and writing demands.
David Westcott also would like to thank the training department at Aruba Networks. In 2004 Aruba Networks hired him as their first contract trainer. Much has changed over the years, but it is still a fun and exciting journey.
Writing CWNA: Certified Wireless Network Administrator Study Guide has once again been an adventure. We would like to thank the following individuals for their support and contributions during the entire process.
We must first thank Sybex acquisitions editor Jim Minatel for reaching out to us and encouraging us to write this fifth edition of our book. We would also like to thank our development editor, Kim Wimpsett, who has been a pleasure to work with on multiple book projects. We also need to send special thanks to our editorial manager, Pete Gaughan; our production editor, Katie Wisor; and John Sleeva, our copyeditor.
We also need to give a big shout-out to our technical editor, Ben Wilson of Fortinet (www.fortinet.com). Ben has accumulated years of Wi-Fi experience working for three major WLAN vendors. The feedback and input provided by Ben was invaluable.
Special thanks must also go out to both Andrew vonNagy, CWNE #84, and Marcus Burton, CWNE #78, for their expertise as technical editors in earlier editions of the book.
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 (firstname.lastname@example.org) 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 www.wiley.com/go/cwnasg.
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 thirteen years by creating customized versions of the program for the different editions of the book. You can reach Andras at www.szialab.org.
Thanks to Chris DePuy of the technology research firm, 650 Group (www.650.group.com), for the WLAN industry trend analysis.
Very special thanks to Marco Tisler, CWNE #126, for his content contribution about APIs. Thank you to Chris Harkins for his content about cloud networking. Thanks to Gregor Vucajnk, CWNE #96, for his copy regarding LTE. Thanks to Karl Benedict for his input and content about directional antennas. Thanks to Perry Correll for his input regarding 802.11ax.
Most gracious appreciation to Rick Murphy, CWNE #10, for his content regarding future 5 GHz U-NII bands. Rick offers some outstanding WLAN training resources at howwirelessworks.com.
We need to send thanks to Joel Crane, CWNE #233, of both MetaGeek and Ekahau fame for his contributions and the spectrum analyzer screenshots.
Very special thanks to Adrian Granados for all of his contributions to the wireless community. Be sure and check out his cool Wi-Fi applications at www.adriangranados.com.
Several other WLAN rock stars that are mentioned in the copy of this book: Mike Albano, CWNE #150; Eddie Forero, CWNE #160; James Garringer, CWNE #179; Jerome Henry, CWNE #45; and François Vergès, CWNE #180.
We would also like to thank the following individuals and companies for their support and contributions to the book:
Devin Akin, CWNE #1, of Divergent Dynamics (www.divergentdynamics.com).
Dennis Burrell, Product Innovation Technologist, and Tauni Odia, Marketing Manager of Ventev (www.ventev.com).
Kelly Burroughs, Product Marketing Manager of iBwave (www.ibwave.com).
Mike Cirello, Co-Founder of HiveRadar (www.hiveradar.com).
Jaime Fábregas Fernández, R&D Manager of Tarlogic Research S.L. (www.acrylicwifi.com).
Tina Hanzlik, Director, Marketing Communications at the Wi-Fi Alliance (www.wi-fi.org).
James Kahkoska, CTO - Handheld Network Test, and Julio Petrovitch, Principal Technical Marketing Engineer, Netscout (www.netscout.com).
Brian Long, CWNE #159, Senior Director, Global Professional Services at Masimo (www.masimo.com).
Bruce Miller, VP, Product Marketing, Riverbed Technology (www.riverbed.com).
Jerry Olla, CWNE #238, Technical Solutions Architect, and Jussi Kiviniemi, Senior VP of Ekahau (www.ekahau.com).
Scott Thompson, President of Oberon, Inc. (www.oberoninc.com).
Ryan Woodings, Founder, and Peter Vomocil, CMO of MetaGeek (www.metageek.com).
We also need to thank Keith Parsons, CWNE #3, and his team at wirelessLAN Professionals. Keith has built a worldwide community of WLAN experts that share knowledge. You can learn more about the wirelessLAN Professionals conferences at www.wlanpros.
We would also like to thank, Tom Carpenter, CWNE #104, 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 the past two decades.
Finally, we would like to thank Chuck Lukaszewski, CWNE #112, for his gracious foreword that he wrote for this book.