A. Windows 2000 domains have two modes: mixed (which lets Windows NT 4.0 BDCs participate in domain replication) and native (which lets only Win2K-based domain controllers--DCs--participate in domain replication). Win.NET Server introduces new functionality to both domains and forests, including new domain renaming abilities. As a result, Microsoft has added a new mode for domain functionality, as listed below.
| Domain Mode | DCs Supported |
| Win2K mixed (default) | Win.NET, Win2K, NT 4.0 |
| Win2K native | Win.NET, Win2K |
| Win.NET | Win.NET |
The differences between Win2K mixed and Win2K native are the same under Win.NET Server as they are under Win2K. However, the Win.NET Server domain mode adds support for
- a DC renaming tool.
- an enhanced user log-on timestamp.
- Kerberos Key Distribution Center (KDC) key version numbers.
- user password support for InetOrgPerson, which is a standard object class defined in IEEE's Requests for Comments (RFC) 2798.
Win.NET Server also adds a new mode for forest functionality, as listed below.
| Forest Mode | DCs Supported |
| Win2K (default) | Win.NET, Win2K, NT 4.0 |
| Win.NET | Win.NET |
To upgrade the forest to Win.NET Server, all domains within the forest must be in Win.NET Server mode or Win2K native mode. The Win.NET Sever forest mode adds support for
- tuning Global Catalog (GC) replication.
- creating bidirectional transitive forest trusts.
- performing domain renaming (DNS and NetBIOS name).
- improving replication algorithms (including the ability to replicate individual group membership changes instead of replicating information about the entire group).
- deactivating an unneeded class or attribute.