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An Extended Service Set is comprised of a number of IEEE 802.11 BSS (Basic Service Set) and enables limited mobility within the WLAN (Wireless Local Area Network). Stations are able to move between BSS within a single ESS yet still remain “connected” to the fixed network and so continue to receive emails etc. As a Station moves into a new BSS, it will carry out a reassociation procedure with the new AP (Access Point).
