Can I connect a wired device to access network?

I have an Airport Express set up as "Join a Wireless network" Can I connect a wired device to the ethernet port of my AE so that it can access the network?

The Ethernet port is normally enabled in the "Join" mode,  if you have one of the newer 802.11n models of the AirPort Express.
If you have an older "b/g" version of the Express, the Ethernet port is not enabled in the "join" mode. Check the model number on the side of the Express. If you see A1084 or A1088, this is an older version of the Express.
Test your current Express to see if the port is already enabled by temporarily turning off the wireless on a laptop and connecting the laptop to the Express using an Ethernet cable. See if you can get an Internet connection. If you can, you know the Ethernet port is working.

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