Using a SCA means that all APs will be using the same channel in a given layer. How is the AP with which the client associates determined?
A.
All APs share a virtual IP address. A controller will tell the closest AP to the client to communicate with it, since it has a greater RSSI from the client.
B.
All APs share a virtual Multicast Address. A controller will tell the closest AP to the client to communicate with it, since it has a greater RSSI from the client.
C.
All APs share a virtual BSSID. A controller will tell the closest AP to the client to communicate with it, since it has a greater RSSI from the client.
D.
The client selects the AP based on a known set of MAC to BSSID mappings stored in the clients authorized SSID listing.
The SCA controller assigns to a unique access point the responsibility of handling downlink transmissions for an individual client station. When the controller receives the incoming transmissions of a client, the SCA controller evaluates the RSSI values of the client’s transmissions. Based on incoming RSSI measurements, the SCA controller can allocate a specific AP for downlink transmissions. The client believes that it is associated to a single AP. However, the client moves between different physical APs based on RSSI measurements evaluated by the controller.
Single-channel architecture is based on a principle of "virtual cells". All APs joined to a virtual cell use the same wireless channel and identify themselves with the same basic service set identifier (BSSID, i.e. a MAC address). The APs in a cell are managed by a centralized Wireless LAN controller (WLC) that coordinates the APs such that APs/transmissions do not interfere with one another. From a client's point of view, a virtual cell appears as a single AP.
The correct answer is C, the APs all share the same virtual BSSID, and the Controller directs which AP to associate with the Client.
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