You are an Enterprise administrator for contoso.com. The company consists of a head office and three branch offices. The corporate network of the company consists of a single Active Directory domain.

Each office contains an Active Directory domain controller. Which of the following options would you choose to create a DNS infrastructure for the network that would allow the client computers in each office to register DNS names within their respective offices? You also need to ensure that the client computers must be able to resolve names for hosts in all offices.

A.
For each office site, create a standard primary zone.

B.
For the head office site, create a standard primary zone and for each branch office site, create an Active Directory-integrated stub zone.

C.
For the head office site, create a standard primary zone at the head office site and for each branch office site, create a secondary zone.

D.
Create an Active Directory-integrated zone at the head office site.

E.
None of the above.

Explanation:

To create a DNS infrastructure for the network that would allow the client computers in each office to register DNS names within their respective offices and to ensure that the client computers must be able to resolve names for hosts in all offices, you need to create an Active Directory-integrated zone at the head office site

Active Directory Integrated zones, store their zone information within Active Directory instead of text files. This ensures that the client computers can resolve names for hosts in all offices. The advantages of this new type of zone included using Active Directory replication for zone transfers and allowing resource records to be added or modified on any domain controller running DNS. In other words, all Active Directory Integrated zones are always primary zones as they contain writable copies of the zone database.

Reference: DNS Stub Zones in Windows Server 2003
http://www.windowsnetworking.com/articles_tutorials/DNS_Stub_Zones.html