Need a bit of help here:

You share a number of files from your computer, and you've recived a number of calls from users why say they can't connect to the files. You check your computer and find that the Ethernet cable is unplugged. You've plugged the Eithernet cable in, so now you need to start the network interface card.

Determine which network interface went down when it was unplugged.

Start the network interface from the command line.

Please note this needs to be down in Linux, with commands.

Thank you