Aerohive Networks is offering this free WLAN Troubleshooting and Design Guide authored by CWNE #4 David Coleman and CWNE #7 David Westcott. This is actually chapter 12 of the Certified Wireless Network Administrator Guide (CWNA).
We would recommend buying the CWNA Study Guide to anyone who interested in, or has the responsibility of managing, WLAN. Put it on your shelf next to your copy of "Microsoft Exchange for Dummies" 😬. Read a chapter a day and you'll be amazed how much you'll learn and come to understand about how wireless works.
Either way, take advantage of this free download and the generosity of Aerohive Networks. Way to go guys! 👍