The National Security Agency just released several guides, with several more to be added shortly, to help Department of Defense
organizations secure Windows 2000.  Many DoD organizations have adopted
the guides as standards.  Sample titles:

• Microsoft Windows 2000 Network Architecture Guide
• Guide to Securing Microsoft Windows 2000 DNS
• Guide to Securing Microsoft Windows 2000 Active Directory

In a major departure from historic precedent, NSA is also making the
documents available to the security community outside the DoD.


You may download these documents directly from the NSA’s site.