Hi Hamza_iraki, With wireless especially, there is no single answer in terms of the optimal configuration as it depends on so many factors; including the client devices used, the requirements of those clients, the environment the APs are placed in, etc. The Best Practice Design documentation, which Brash linked above, is a good read as it explains each of the configuration options and what to consider when choosing which settings to apply. The RF Profiles documentation should also be consulted for further details on each of the options.
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