Your company, Contoso Ltd has a main office and a branch office. The offices are connected by a WAN link.
Contoso has an Active Directory forest that contains a single domain named ad.contoso.com.
The ad.contoso.com domain contains one domain controller named DC1 that is located in the main office.
DC1 is configured as a DNS server for the ad.contoso.com DNS zone. This zone is configured as a standard primary zone.
You install a new domain controller named DC2 in the branch office. You install DNS on DC2.
You need to ensure that the DNS service can update records and resolve DNS queries in the event that a WAN link fails.
What should you do?
A. Create a new stub zone named ad.contoso.com on DC2.
B. Create a new standard secondary zone named ad.contoso.com on DC2.
C. Configure the DNS server on DC2 to forward requests to DC1.
D. Convert the ad.contoso.com zone on DC1 to an Active Directory-integrated zone.
Correct Answer: D
Explanation/Reference:
Answer: Convert the ad.contoso.com zone on DC1 to an Active Directory-integrated zone.
Explanation:
http://technet.microsoft.com/en-us/library/cc726034.aspx
Understanding Active Directory Domain Services Integration
The DNS Server service is integrated into the design and implementation of Active Directory Domain Services (AD DS). AD DS provides an enterprise-level tool for organizing, managing, and locating resources in a network.
How DNS integrates with AD DS
When you install AD DS on a server, you promote the server to the role of a domain controller for a specified domain. As part of this process, you are prompted to specify a DNS domain name for the AD DS domain which you are joining and for which you are promoting the server, and you are offered the option to install the DNS Server role. This option is provided because a DNS server is required to locate this server or other domain controllers for members of an AD DS domain.
Benefits of AD DS integration
For networks that deploy DNS to support AD DS, directory-integrated primary zones are strongly recommended. They provide the following benefits:
. DNS features multimaster data replication and enhanced security based on the capabilities of AD DS. In a standard zone storage model, DNS updates are conducted based on a single-master update model. In this model, a single authoritative DNS server for a zone is designated as the primary source for the zone. This server maintains the master copy of the zone in a local file. With this model, the primary server for the zone represents a single fixed point of failure. If this server is not available, update requests from DNS clients are not processed for the zone.
With directory-integrated storage, dynamic updates to DNS are sent to any AD DS-integrated DNS server and are replicated to all other AD DS-integrated DNS servers by means of AD DS replication. In this model, any AD DS-integrated DNS servercan accept dynamic updates for the zone. Because the master copy of the zone is maintained in the AD DS database, which is fully replicated to all domain controllers, the zone can be updated by the DNS servers operating at any domain controller for the domain. With the multimaster update model of AD DS, any of the primary servers for the directory-integrated zone can process requests from DNS clients to update the zone as long as a domain controller is available and reachable on the network.
Also, when you use directory-integrated zones, you can use access control list (ACL) editing to secure a dnsZone object container in the directory tree. This feature provides detailed access to either the zone or a specified resource record in the zone. For example, an ACL for a zone resource record can be restricted so that dynamic updates are allowed only for a specified client computer or a secure group, such as a domain administrators group. This security feature is not available with standard primary zones.
. Zones are replicated and synchronized to new domain controllers automatically whenever a new one is added to an AD DS domain.
. By integrating storage of your DNS zone databases in AD DS, you can streamline database replication planning for your network.
. Directory-integrated replication is faster and more efficient than standard DNS replication.
Further information:
