How can I verify that my Ethernet network is running at Full-Duplex (20/200Mbps) rather than Half-Duplex (10/100Mbps)?
You’ll have to rely on the lights on your NIC and switch in most cases. The speeds reported by Windows’ network connection properties do not take into account full-duplex operation. You can check the Advanced Network properties for your NIC to see if you can force the speed and mode. It’s also possible that your network adapter came with a utility that might show how the adapter is actually set up as well as configure it.
