Will Wi-Fi on the CXN100 be disabled when an Ethernet connection is used?

On start-up, the CXN100 software will first automatically try for a wired (Ethernet) connection first, if it can't find anything it will default to a wireless Wi-Fi connection (while still monitoring for a wired connection). Once a connection is established the other non-connected method interface is turned off.

So if you are connected to your network via Ethernet the Wi-Fi connection method will be disabled.