I would like to know what duplex (half or full) my network card has negotiated with a switch when they are both set to auto configuration in Windows.
Without looking at the switch, the only way it seems possible is if the windows driver for your NIC reports this information. To see if it does, go to
Control Panel --> Administrator Tools --> Event Viewer. You then want to look at the System logs (in Windows7 this is under the Windows Logs tree). Once you found the System logs, click on Source at the top to use as the sorting criteria. Now look for your NIC driver, mine for example is b57nd60a. Scroll through all the entries that your NIC driver has made and if you're lucky you'll see what speed it negotiated at in the event report.
On my Windows 7 Platform -
- List item
Type at the Windows 7 search bar Network and Sharing Center. Select - Network and Sharing Center
Change Adapter Settings
Right Click ( The LAN Lannetwrk Adapter) select Status it will show you the speed you have negotiated with the next network device up stream.