Your company has a main officeand a branch office.
You discover that when you disable IPv4 on a computer in the branch office, the computer
authenticates by using a domain controller in the main office.
You need to ensure that IPv6-only computers authenticate to domain controllers in the same site.
What should you do?
A.
Configure the NTDS Site Settings object.
B.
Create Active Directory subnet objects.
C.
Create Active Directory Domain Services connection objects.
D.
Install an Intra-Site Automatic Tunnel AddressingProtocol (ISATAP) router.
Explanation:
http://technet.microsoft.com/en-us/library/cc754697.aspx
Understanding Sites, Subnets, and Site Links
Sites overview
Sites in AD DS represent the physical structure, ortopology, of your network. AD DS uses network topology
information, which is stored in the directory as site, subnet, and site link objects, to build the most efficient
replication topology. The replication topology itself consists of the set of connection objects that enable inbound
replication from a source domain controller to the destination domain controller that stores the connection
object. The Knowledge Consistency Checker (KCC) creates these connection objects automatically on each
domain controller.
..
Associating sites and subnets
A subnet object in AD DS groups neighboring computers in much the same way that postal codes group
neighboring postal addresses. By associating a sitewith one or more subnets, you assign a set of IP addresses
to the site.
Note
The term “subnet” in AD DS does not have the strictnetworking definition of the set of all addresses
behind a single router. The only requirement for anAD DS subnet is that the address prefix conforms to
the IP version 4 (IPv4) or IP version 6 (IPv6) format.
When you add the Active Directory Domain Services server role to create the first domain controller ina forest,
a default site (Default-First-Site-Name) is createdin AD DS. As long as this site is the only site inthe directory,
all domain controllers that you add to the forest are assigned to this site. However, if your forest will have
multiple sites, you must create subnets that assignIP addresses to Default-First-Site-Name as well asto all
additional sites.