question about usb 2

I've recently gotten a new Dimension 4700 and want to make sure I've got USB 2 ports.

 

I checked the system as Dell says to and I do see 5 USB Root Hub listings along with 4 USB Universal Host Controller listings and one that says USB2 Enhanced Host controller and one that says USB printing support.

 

I assume I've got USB2 - is that in all the USB ports in general or only in certain ports. 

 

I know I should know this stuff but I don't - I've been working on an old computer for years...;-)

 

Thanks in advance.