If you use Windows 2000 DNS (for Active Directory ..etc) use only Secure Updates
Windows 2000 and later gives you the option to configure your DNS as Active Directory Integrated Zone (ADIZ). This mode is required for name and service automatic update and its super crucial to a successful Active Directory (and some of other MS products like Exchange) … “If you use Windows 2000 DNS (for Active Directory ..etc) use only Secure Updates”
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