Your company has two Active Directory forests named contoso.com and fabrikam.com.
The company network has three DNS servers named DNS1, DNS2, and DNS3. The DNS
servers are configured as shown in the following table.
All computers that belong to the fabrikam.com domain have DNS3 configured as the
preferred DNS server. All other computers use DNS1 as the preferred DNS server.
Users from the fabrikam.com domain are unable to connect to the servers that belong to the
contoso.com domain.
You need to ensure users in the fabrikam.com domain are able to resolve all contoso.com
queries.
What should you do?
A.
Configure conditional forwarding on DNS1 and DNS2 to forward fabrikam.com queries to
DNS3.
B.
Create a copy of the _msdcs.contoso.com zone on the DNS3 server.
C.
Create a copy of the fabrikam.com zone on the DNS1 server and the DNS2 server.
D.
Configure conditional forwarding on DNS3 to forward contoso.com queries to DNS1.
Explanation:
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.
