If you are planning to take the CWNA exam then this is the book you NEED. If not it is still an excellent reference for wireless technology. It covers DSSS, FHSS, governing bodies, devices, RF properties, WLAN security, troubleshooting and site surveys as well as all the main WLAN standards. It also contains simulated examination questions. One point to note is that although the book states 100% complete coverage you will probably find actual exam questions that are not contained in the book. Having said that if you study this book thoroughly you should be able to take the exam with confidence.