I have an airport extreme hardwired in my basement. I want to have great wifi throughout my house so I bought an airport express that I can hardwire upstairs via ethernet. In my house, I have a switching hub in my basement. My modem and my airport extreme are connected through the hub. I have cat5 cables running into every room in my house and I have the room where I am hard wiring my airport express running through the switch as well. I heard it is better to setup 2 separate networks between the extreme and express than to extend my network since I have the ability to hardwire each device. I am not sure how to do this using airport utility. Is my thought process correct and can somebody please help me with this? Thanks in advance.