What are the differences between NT 4.0 and 2000 domains?

A. Domain implementation in Windows 2000 was basically written from the ground up with its directory service roots and the table below shows the major differences:

Feature Windows NT 4 Windows 2000 mixed-mode Windows 2000 native-mode
Number of objects 40,000 (20,000 recommended) 40,000 (20,000 recommended) 1,000,000 although 4,000,000 has been listed
Multimaster replication No Yes Yes
Group types Global, Local Global, Domain Local Universal, Global, Domain Local
Nested groups No No Yes
Cross-domain administration Limited Limited Full
Password filters Manually installed with SP2 and above Manually installed Automatically installed
Queries using desktop change/configuration management No 2000 DC's only Yes
Authentication protocols NTLM NTLM, Kerberos Kerberos (but NTLM supported for NT 4 and Windows 9x clients)

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