Hi there! You can actually download the drivers on Dell's website. You can either use the model number or use the Service Tag on your Optiplex Computer to show all the drivers for your computer.
I was able to browse to their site, and was able to list down all the drivers for your computer. Click here to get into their website.
You would still need to select the appropriate Operating System for your computer to download the compatible driver for your ethernet controller.
Hope this helps!
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