netdiag is a powerful, network-testing utility that performs a variety of network diagnostic tests that can help you to pinpoint a networking problem. The output listing below shows the output from a typical execution of the Netdiag command. You can scan this listing to see the types of tests that the netdiag command performs.

Refer below link for dcdiag swiches:

 -us/library/cc773199(WS.10).aspx 

Note:Netdiag.exe tool has been deprecated in Vista and Windows Server 2008. It's not supported. However if you want to execute netdiag copy Netdiag.exe file from Windows server 2003 to server 2008 and give a shot it should work fine

 -server-2008/where-is-netdiag-for-win-server-2008/

Hope this helps




Netdiag Utility