When you change your network configuration often it may make the process more efficient to backup your commonly used network settings so you can restore them in a much faster process by using the Netsh utility.
Take a moment to name your network connections appropriately and save yourself time when troubleshooting later on.
How to prevent caching of failed DNS lookups from preventing you from having DNS name queries resolved.
How to tell who's currently logged on to an Active Directory domain.
When testing Group Policy settings, being able to force a policy update can be very convenient. This can be done with the gpupdate command.