Active Directory–integrated DNS enables Active Directory storage and replication of DNS zone databases. Windows 2000 DNS server, the DNS server that is included with Windows 2000 Server, accommodates storing zone data in Active Directory. When you configure a computer as a DNS server, zones are usually stored as text files on name servers — that is, all of the zones required by DNS are stored in a text file on the server computer. These text files must be synchronized among DNS name servers by using a system that requires a separate replication topology and schedule called a zone transfer However, if you use Active Directory–integrated DNS when you configure a domain controller as a DNS name server, zone data is stored as an Active Directory object and is replicated as part of domain replication. 

You may need to clear bad information in Active Directory-integrated if DNS is damaged or if the DNS contains incorrect registration information. To do that 

1. Change the DNS settings to Standard Primary Zone.
2. Delete the DNS zones.
3. Use ipconfig /flushdns command.
4. Recreate the DNS zones.
5. Restart Net Logon service
6. Use ipconfig /registerdns