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9.2 BSS/ESS
BSS
A group of Wireless Stations and a single Access Point, all using the
same ID (SSID), form a Basic Service Set (BSS).
Using the same SSID is essential. Devices with different SSIDs are
unable to communicate with each other.
ESS
A group of Wireless Stations, and multiple Access Points, all using
the same ID (ESSID), form an Extended Service Set (ESS).
Different Access Points within an ESS can use different Channels. In
fact, to reduce interference, it is recommended that adjacent Access
Points SHOULD use different channels.
As Wireless Stations are physically moved through the area covered
by an ESS, they will automatically change to the Access Point which
has the least interference or best performance. This capability is
called Roaming. (Access Points do not have or require Roaming
capabilities.)
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