Contoso, Ltd. has an Active Directory domain named ad.contoso.com. Fabrikam, Inc. has an
Active Directory domain named intranet.fabrikam.com. Fabrikam’s security policy prohibits
the transfer of internal DNS zone data outside the Fabrikam network.
You need to ensure that the Contoso users are able to resolve names from the
intranet.fabrikam.com domain.
What should you do?

A.
Create a new stub zone for the intranet.fabrikam.com domain.

B.
Configure conditional forwarding for the intranet.fabrikam.com domain.

C.
Create a standard secondary zone for the intranet.fabrikam.com domain.

D.
Create an Active DirectoryCintegrated zone for the intranet.fabrikam.com domain.

Explanation:
Answer) Configure conditional forwarding for the intranet.fabrikam.com domain.

http://technet.microsoft.com/en-us/library/cc730756.aspx
Understanding Forwarders
A forwarder is a Domain Name System (DNS) server on a network that forwards DNS
queries for external DNS names to DNS servers outside that network. You can also forward
queries according to specific domain names using conditional forwarders.
You designate a DNS server on a network as a forwarder by configuring the other DNS
servers in the network to forward the queries that they cannot resolve locally to that DNS

server. By using a forwarder, you can manage name resolution for names outside your
network, such as names on the Internet, and improve the efficiency of name resolution for
the computers in your network.
The following figure illustrates how external name queries are directed with forwarders.

Conditional forwarders
A conditional forwarder is a DNS server on a network that forwards DNS queries according
to the DNS domain name in the query. For example, you can configure a DNS server to
forward all the queries that it receives for names ending with corp.contoso.com to the IP
address of a specific DNS server or to the IP addresses of multiple DNS servers.
Further information:
http://technet.microsoft.com/en-us/library/cc794735%28v=ws.10%29.aspx
Assign a Conditional Forwarder for a Domain Name
http://technet.microsoft.com/en-us/library/cc754941.aspx
Configure a DNS Server to Use Forwarders