What is the nature of Wirless N and Dual Band?

[raven_squire]

Hello, I have just purchased a WNDR3700 and I am figuring out how to set it up. I have only had experience with Wireless G and I would like to know more about Wireless N600 and Dual band.

I'm assuming that if a Wireless G device is connected the access point that is running with wireless N clients that the network speed drops back to that of wireless G.

Does using the different SSID's that this router supports allow me to segregate the different standards and keep the wireless network running as fast as possible e.g. on wireless network for A B and G devices and the other for N?

Also, this router supports simultaneous dual band but you have to select one band or the other when you set up an access point (at least that was my impression from the 5 minutes that I had to spend with the device). Does this mean that I have to connect to two separate networks to get the full speed on wireless N600 (I had imagined that this would have been automatically negotiated).

I understand that these are probably newbie questions but any help is greatly appreciated.

Thanks
Raven_Squire