Roaming with Autonomous APs
In Chapter 6, “Understanding 802.11 Frame Types,” you learned that a wireless client can move from one basic service set (BSS) to another by roaming between APs. A client continuously evaluates the quality of its wireless connection. If the signal quality degrades, the client begins looking for an AP with a better signal. The process is usually quick and simple; active scanning reveals candidate APs, and then the client selects one and tries to reassociate with it.
Figure 12-1 shows a simple scenario with two APs and one client. The client begins with an association to AP-1. Because the APs are running in autonomous mode, each one maintains a table of its associated clients. AP-1 has one client; AP-2 has none.
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