It would be great to get the duplex setting of the network adapters:
Powershell commands
To see the available adapters
Get-NetAdapter
To query the adapter setting
Get-NetAdapter | SELECT name, fullduplex | where name -eq 'card name'
For example on Windows 10 here is the command and results:
PS C:\> Get-NetAdapter | SELECT name, fullduplex | where name -eq 'Ethernet'
name fullduplex
---- ----------
Ethernet True