An 802.11 LAN derived from cellular architecture where the system is divided into cells, where each cell (Basic Services/ BSS in the 802.11) is controlled by the Main Station or Access Point (AP)though a wireless LAN may be formed by a single cell, with a single Access Point it can also work without an Access Point. some installations will be formed by several cells, where the Access Point are connected to some kind of backbone (Distribution System) Ethernet or even wireless.
The interconnected Wireless LAN including different cells and there
respective Access Point with the Distribution System in most case always set to the upper layer of the OSI model, a single 802 network is called as Extended Service Set (ESS)
The picture shows a typical 802.11 LAN
The ESS also defines the concept of Portal, a Portal is a device that interconnects with two networks a 802.11 and another 802 LAN. This concept is an abstract description of the "translation bridge"
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