HELP! New MacBook Not Connecting With Ethernet

<p>I got a new macbook and I can't connect it using the ethernet cable living in west.
I remember calling CIT and they told me to change something about the duplex in network settings.</p>

<p>Does anybody remember the steps?</p>

<p>So…I’m guessing the CIT staff is so small that not even a single one of them is in CC
-_-</p>