Wasn't true with either asrock- extreme6 or pro3. I couldn't access internet before I had installed the latest LAN drivers from asrock website. Don't know if it's asrock specific problem or what but that was the case with both boards.
If you don't have another pc to browse internet with and want to play it safe, you can download the driver from your motherboard manufacturer's website. Can save it on a usb thumb drive if you have one.