Configure ethernet adapter for MacBook Air

We use a dock with a MacBook Air.  Both were purchased about six months ago.  The dock has an ethernet port.  Under the Network Preferences I only see a wireless connection. Will I see the ethernet connection when docked?  If not how can I be sure the ethernet is being used?
Gregg

It could depend on the dock's compatibility with Lion/Mountain Lion. Some ethernet connectors will not function with recent changes in the OS. Even Apple's own USB ethernet adapter is incompatible. Users find that only the Thunderbolt-ethernet adapter will work.

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