Does it really transmit via both dual bands or just select one of the band at a time?
Both bands. I have at home a dual band 802.11g and 802.11n. This one uses the 2.4 GHz band for g, and the 5 GHz band for n. In the setup options, you can disable one or the other, if you want.
So it treats each band as its own 802 LAN, and it also supports four Ethernet devices as a third LAN, all feeding the one router. All layer 2, in other words, downstream of the connection to the broadband link.
By disabling the WiFi access point's own DHCP server, and using one of the access point's Ethernet links for the connection to my ADSL modem, I made my WiFi access point a layer 2 device only. And all systems connected to it use the DHCP server of the modem instead.
Anyway, the short answer is that if you want multiple bands enabled, then each one behaves like its own LAN, and they are bridged together at layer 2. At least, in mine they are. All my home systems belong to the same IP subnet, no matter whether they are Ethernet, 802.11g, or 802.11n. And this is true even if I configure the access point to behave as a router (layer 3).
It uses both band. The network manager will show two different access point information in the client. For example a TP link access point will generate two (TPLink_2.4 GHz and TPLink 5 GHz) access point name in your laptop, you can connect any of them. They operate in different frequency band.
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