Your network contains an Active Directory domain named contoso.com. The domain contains a domain
controller named DC1 that hosts the primary DNS zone for contoso.com.
All client computers are configured to use DC1 as the primary DNS server.
You need to configure DC1 to resolve any DNS requests that are not for the contoso.com zone by querying the
DNS server of your Internet Service Provider (ISP).
What should you configure?

A.
Name server (NS) records

B.
Condition& forwarders

C.
Forwarders

D.
Naming Authority Pointer (NAPTR) DNS resource records (RR)

Explanation:
A: Specifies a name server for the domain, which allows DNS lookups within various zones. Each primary
andsecondary name server should be declared throughthis record. B: http://windowsitpro.com/networking/qwhats-conditional-dns-forwarding C: manage the Domain Name System (DNS) traffic between your network
and the Internet D.
Configure forwarders to send DNS queries directly to your ISP’s DNS server or other DNS servers.
Most of the time, when you configure forwarders, DNS performance and efficiency increases, but
thisconfiguration can also introduce a point of failure if the forwarding DNS server is experiencing problems.
A forwarder is a Domain Name System (DNS) server ona network used to forward DNS queries for
externalDNS names to DNS servers outside of that network. A DNS server on a network is designated as a
forwarder by having the other DNS servers in the networkforward the queries they cannot resolve locally to that
DNS server.
By using a forwarder, you can manage name resolution for names outside of your network, such as names
onthe Internet, and improve the efficiency of name resolution for the computers in your network.
http://social.technet.microsoft.com/Forums/en-US/winserverNIS/thread/2f35cae2-341c- 4bfe-9dac-724ddace6d51/
http://technet.microsoft.com/en-us/library/cc722542.aspx http://technet.microsoft.com/en-us/library/cc754931.
aspx