The first edition of this book was called DNS on Windows NT and dealt with Microsoft’s DNS implementation for that operating system. This new edition has been comprehensively updated to document the many changes to DNS, large and small, found in Windows 2000. The most significant new feature in Windows 2000 is Active Directory, and this edition describes how Active Directory depends on DNS, including the extra DNS resource records required for a domain controller to function properly. Other new DNS features explained are dynamic update, incremental zone transfer, and storing DNS zone information in Active Directory itself rather than in a text file on disk. The new material appears throughout the book, but many features are described in a new chapter for this edition, Chapter 11. The resolver, or client side of DNS, has also changed in Windows 2000, and Chapter 6 has been updated to document the behavior of the Windows 2000 and Windows 98 resolvers.