Describe DNS zone types and the concept of dynamic updates in Windows Server 2008.

• A. Zone types include primary, secondary, and AD-integrated zones; dynamic updates allow DNS records to be registered automatically by clients and domain controllers.
• B. Zone types include primary and secondary only; dynamic updates are not supported.
• C. AD-integrated zones are only for domain controllers and do not support dynamic updates.
• D. Secondary zones perform dynamic updates on behalf of clients.

Answer: (A)

In Windows DNS, zone types determine where data is stored and who can update it, while dynamic updates describe how records are created or updated automatically. A primary zone is writable and holds the authoritative data for the zone. A secondary zone is a read-only copy used for redundancy and load distribution. AD-integrated zones store zone data in Active Directory and replicate with AD, which also allows dynamic updates to be coordinated through AD permissions. Dynamic updates let DNS records be registered automatically by clients and domain controllers, so host A records (and their PTR records) are created and kept current without manual edits. In Windows Server 2008, dynamic updates can be secured to ensure only authenticated machines update the records, leveraging AD’s security model. This description matches how zone types and dynamic updates work together in that edition. The other statements misstate either the available zone types or the support for dynamic updates, or how AD-integrated zones operate.