What is the proper name format for logging onto an AD child domain?

University of Nevada Reno

When a user logs on to an AD child domain in Windows 2003, do they logon as "child_domainuser_name" or "domainchild_domainuser_name"?

This is the correct format:

user@childdomainname

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or the older style:

childdomainnameuser

This was last published in June 2005

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