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ZyWALL 10~100 Series Internet Security Gateway
Wireless LAN and IEEE 802.11 4-3
Diagram 4-1 Peer-to-Peer Communication in an Ad-hoc Network
Infrastructure Wireless LAN Configuration
For Infrastructure WLANs, multiple Access Points (APs) link the WLAN to the wired network and allow
users to efficiently share network resources. The Access Points not only provide communication with the
wired network but also mediate wireless network traffic in the immediate neighborhood. Multiple Access
Points can provide wireless coverage for an entire building or campus. All communications between stations
or between a station and a wired network client go through the Access Point.
The Extended Service Set (ESS) shown in the next figure consists of a series of overlapping BSSs (each
containing an Access Point) connected together by means of a Distribution System (DS). Although the DS