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CCNA Wireless 640-722 Official Cert Guide by David Hucaby

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DCA

Recall from Chapter 7, “Planning Coverage with Wireless APs,” and Chapter 12, “Understanding Roaming,” that a proper channel assignment is vital for efficient use of air time and for client mobility. When neighboring APs use the same channel, they can interfere with each other. Ideally, adjacent APs should use different, non-overlapping channels. Working out a channel layout for many APs can be a difficult puzzle, but the DCA algorithm can work out optimum solutions automatically for all APs in an RF group.

When a new AP first powers up, it uses the first non-overlapping channel in each band—channel 1 for 2.4 GHz and channel 36 for 5 GHz. Consider a simplistic scenario where all APs are new and powered up for the first time. You would end ...

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