Discuss how an ESS works.

Question

What will be an ideal response?

Answer 1

For an Extended Service Set (ESS), BSS networks are connected through a common distribution system, and APs are strategically placed so that users can move through a wider BSA.  Although APs are often configured with different channels to prevent co-channel interference, the range of channels (the WLAN's frequency range) is part of the ESS. Like a BSS, the entire ESS network has a unique SSID.
In an ESS, APs are set up to provide some overlap. The coverage areas are called cells, and the WLAN is set up like a cell phone system. Movement between AP coverage areas is called roaming. When mobile users move into a new coverage area, their devices select the AP with the best signal strength. After the AP accepts the roaming device, the device tunes to the AP's channel but continues to survey radio frequencies at regular intervals to see whether another AP can provide a stronger signal.