David D. Coleman - CWNA Certified Wireless Network Administrator - 107 Study guide

David D. Coleman, CWNE #4

David A. Westcott, CWNE #7

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An investment in knowledge always pays the best interest.

Benjamin Franklin, one of the Founding Fathers of the United States.

Almost fifteen years ago, we were approached by our publisher to co-author a study guide for the Certified Wireless Network Administrator (CWNA) certification exam. At the time, the phrase Wi-Fi was only a few years old and had yet to become ingrained into our culture. 802.11g technology had begun to emerge and we were so excited by the blazing speeds of 54 Mbps available on the 2.4 GHz frequency band. We agreed to author the book. Five editions later, 802.11 WLAN technology has drastically evolved and Wi-Fi is now an integral part of our day-to-day lives.

The CWNA certification has long been recognized as the foundation-level certification for network professionals looking to validate their knowledge of 802.11 WLAN technology. As authors, we have been humbled by the tens of thousands of individuals who have purchased the CWNA Study Guide to assist in their pursuit of the CWNA certification. We are also humbled that many universities and colleges have selected the book as part of their curriculum for wireless technology classes. In our travels, we have met and become friends with many of our readers of the past four editions of the book. We discovered that a large number of people who purchase the book use it as a reference guide in the workplace and not just as a study guide. We have also had many people tell us that the book has helped them advance in their Wi-Fi careers. Once again, we are very humbled, and we would like to dedicate the 5th edition of the CWNA Study Guide to our readers.

Our goal has always been to educate as many people as possible about WLAN technology. If you are a newcomer to 802.11 wireless networking, we hope this book will be your first investment in Wi-Fi knowledge. If you are a veteran WLAN professional, we hope that when you are done reading this book, you will pass it along to a friend or a colleague. Sharing the Wi-Fi knowledge will be a sound investment.

Sincerely,

David Coleman and David Westcott

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.