Default I believe is the same SSID for 5Ghz and 2.4Ghz on A3, you can change them if you want but won't get full "roaming" capability. If your SSID's are different, then in order to see them both you must be using a device that can connect via 5 and 2.4 (most new devices can). If you have a 2.4 only device, and the SSID's are the same, you will connect just to the 2.4 network automatically.