If your wired network is running 802.1X authentication, you might find it useful to export and import your wired network profile in Windows Vista or 7. You can quickly apply the 802.1X settings to multiple PCs, for example.
First, reference a list of wired profiles and their settings:
netsh lan show profiles
To export a profile:
netsh lan export profile folder=PATH_TO_FOLDER interface="INTERFACE_NAME"
This creates an XML file in the specified folder, named by the interface name.
To import a wired profile into Windows Vista or 7:
netsh lan add profile filename="PATH_AND_FILENAME.xml" interface="INTERFACE_NAME"
