There is no ethernet port on the macbook air. WiFi is built in. I have one and have never used anything other than the WiFi. Apple sells adaptors.
Search Results - Apple Store (U.S.)
(For the macs with a thunder port.
Apple - MacBook Air - Compare the 11- and 13-inch MacBook Air.
You will see the ports available about 1/3 down the page.
What are you using that requires more than the four gig memory that comes with it?
