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CCNA Wireless (640-722 IUWNE) Quick Reference by Jerome Henry

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Chapter 1. WLAN Fundamentals

Wireless networks are not a new concept. The first wireless transmission occurred in 1870. During the 20th century, analog communication became digital and proprietary solutions blossomed to transmit information over RF. To organize the use of the spectrum, an international agreement allowed several portions of the spectrum to be used without license for industrial, scientific, and medical (ISM) purposes. Local regulations were created that forbade most segments of the RF spectrum for private use. Proprietary solutions moved to controlled bands (paying a fee for the right to use the spectrum segment) or to the ISM bands (free, but with risks of interferences from other networks). It was only in 1997 that the IEEE ...

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