Exam Essentials
Understand the IEEE 802.11a specification. 802.11a runs in the 5 GHz spectrum, and if you use the 802.11h extensions, you have 23 non-overlapping channels. 802.11a can run up to 54 Mbps, but only if you are less than 50 feet from an access point.
Understand the IEEE 802.11b specification. IEEE 802.11b runs in the 2.4 GHz range and has three non-overlapping channels. It can handle long distances but with a maximum data rate of up to 11 Mpbs.
Understand the IEEE 802.11g specification. IEEE 802.11g is 802.11b’s big brother and runs in the same 2.4 GHz range, but it has a higher data rate of 54 Mbps if you are less than 100 feet from an access point.
Remember the wireless LAN modulation techniques. Direct Sequence Spread Spectrum (DSSS) is the most widely used modulation technique, but it has speeds only to 11 Mbps. Frequency Hopping Spread Spectrum (FHSS), although it is used in wireless devices like Bluetooth, isn’t the technique of choice for either vendors...
