I am currently reading the Certified Wireless Network Administrator book 4th Edition by the CWNP group and Sybex. It is the Official Study Guide for the CWNA-106 exam. Hopefully, it will be more pertinent than the book I purchased for the CCNA Wireless Exam. I really liked the information in the Cisco Book but you really had to augment the information with hands-on lab experience as well as memorizing the types of questions on the exam and focusing on online Cisco resources and forums to learn the balance of information. I think that was good on the whole because it pushed me back into the material so that I would continue learning. I am still working on the third chapter. Much of the first part of the book is review. What I like about the review is that it treats the information from another person or group of peoples perspective. The Cisco waves on a rope analogy is pretty crude. I am fortunate in that I have been studying waveforms and have had access to oscilloscopes and service monitors since I was in grade school.
Some of the good information that I have gleaned from it so far is that the ISO standards are named from the Greek word isos or iσoϛ. This basically means equal or same. The group itself is named the International Organization for Standardization. Makes more sense now. It would be IOS if they used the name or possibly IOFS. Honestly how many more versions of IOS do we need?
I have learned an interesting fact about where the term decibel comes from. Decibels are relative units of measurement. They were originally created by Bell Labs. The unit of measure describes the difference in power of 10 to 1. This unit is a bel. Each 10 to 1 difference in signal amplitude is 1 bel. They further broke the unit into 10 pieces referred to as decibels. 1 bel = 10 decibels. The decibel allows very large differences in signal to be expressed using small easy-to-use values.