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CCNA Wireless 640-722 Official Cert Guide by David Hucaby

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802.11n

Under the best conditions, both 802.11g and 802.11a are capable of offering a 54-Mbps data rate. Each amendment was introduced in the days when wired Ethernet devices used 10- or 100-Mbps connections. As the speed of Ethernet connections has progressed, 802.11 amendments have been introduced to keep in step.

The 802.11n amendment was published in 2009 in an effort to scale wireless LAN performance to a theoretical maximum of 600 Mbps. The amendment defines a number of techniques known as high throughput (HT) that can be applied to either the 2.4- or 5-GHz band. 802.11n was designed to be backward compatible with 802.11b, 802.11g, and 802.11a.

Before 802.11n, wireless devices used a single transmitter and a single receiver. In other words, ...

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