[单项选择]Your company has a single active directory forest that has an active directory domain named na.contoso.com. a member server named server2 runs the DNS server role. The server2 DNS service hosts multiple secondary zones including na.contoso.com. you need to reconfigure server2 as a caching-only DNS server. What should you do?（）
A. Uninstall and reinstall the DNS service on server2.
B. Change all the DNS zones on server2 to stub zones.
C. Disable and then enable the DNS service on server2.
D. Delete the na.contoso.com DNS zone domain from server2. Restart the DNS service on server2.

[单项选择]your company has a single active directory forest that has a domain in North America named na.contoso.com and a domain in south America named sa.contoso.com. The client computers run windows vista. You need to configure the client computes in north America office to improve the name resolution response time for resources in the south ameirca offica. What should you do?（）
A. Configure a new GPO that disables the Local-Link multicast name resolution feature. Apply the policy to all the client computes in the north America office.
B. Configure a new GPO that enables the local-Link Multicast name resolution feature. Apply the policy to all the client computers in the north America office.
C. Configure a new GPO that configures the DNS suffix search list option to sa. Contoso.com, na.contoso.com apply the policy to all the client computers in the north America office.
D. Configure the priority value for the SRV records on each of the north America domain controllers to 5.

[单项选择]Your company has a single active directory forest that has an active directory domain named na.contoso.com.zone. you have enabled DNS scavenging on server1. Three weeks later, you notice that the stale resource records remain in na.contoso.com. you need to ensure that the stale resource records are removed from na.contoso.com. what should you do?（）
A. Stop and restart the DNS service on server1.
B. Enable DNS scavenging on the na.contoso.com zone.
C. Run the dnscmd server1 /ageallrecords command on server1/.
D. Run the dnscmd server1 /startscavenging command on server1.

[单项选择] Your company has a single Active Directory forest that has an Active Directory domain named na.contoso.com. A server named Server1 runs the DNS Server server role. You notice stale resource records in the na.contoso.com zone. You have enabled DNS scavenging on Server1. Three weeks later, you notice that the stale resource records remain in na.contoso.com. You need to ensure that the stale resource records are removed from na.contoso.com. What should you do？（）
A. Stop and restart the DNS Server service on Server1.
B. Enable DNS scavenging on the na.contoso.com zone.
C. Run the dnscmd Server1 /AgeAllRecords command on Server1.
D. Run the dnscmd Server1 /StartScavenging command on Server1.

[多项选择]our company has a single active directory forest that has six domains. All DNS servers in the forest run windows serve 2008. You need to ensure that all public DNS queries are channeled though a single-caching-only DNS server.Which two actions should you perform? （）
A. Disable the root hints.
B. Enable BIND secondaries.
C. Configure a forwarder to the caching DNS server.
D. Configure a GlobalNames host (A) record for the hostname of the caching DNS server.

[单项选择]Your company has an active directory forest that has five domains. All DNS servers are domain controllers. You need to ensure that users from all domains are able to access a web server named App1 by browsing http://App1. What should you do?（）
A. Configure and enable DFS-R on the App1 Web Server.
B. Create a host (AAAA) record for the App1 Web server in the DNS zone for the forest root domain.
C. Create a zone named GlobalNames on a DNS server. Replicate the GloballNames zone to all domain controllers in the forest. Create a host (A) record for the App1 Web server in the zone.
D. Create a zone named LegacyWNS on a DNS server. Replicate the LegacyWNS zone to all domain controllers in the forest. Create a host (A) record for the App1 Web server in the zone.

[单项选择]Your company has a single active directory domain. All servers run windows server 2008. You install an additional DNS server that runs windows server 2008. You need to delete the pointer record for the IP address 10.3.2.127. what should you do?（）
A. Use DNS manager to delete the 127.in-addr.arpa zone.
B. Run the dnscmd /recordelte 10.3.2.127 command at the command prompty.
C. Run the dnscmd /zonedelete 127.in-addr.apa command at the command prompt.
D. Run the dnscmd /recorddelete 10.in-addr.arpa 172.2.3 PRT command at the command prompt.

[单项选择]Your company has a single Active Directory domain. The company has a main office and a branch office. Both the offices have domain controllers that run Active Directory-integrated DNS zones. All client computers are configured to use the local domain controllers for DNS resolution. The domain controllers at the branch office location are configured as Read-Only Domain Controllers (RODC).You change the IP address of an existing server named SRV2 in the main office.You need the branch office DNS servers to reflect the change immediately.What should you do？（）
A. Run the dnscmd /ZoneUpdateFromDs command on the branch office servers.
B. Run the dnscmd /ZoneUpdateFromDs command on a domain controller in the main office.
C. Change the domain controllers at the branch offices from RODCs to standard domain controllers.
D. Decrease the Minimum (default) TTL option to 15 minutes on the Start of Authority (SOA) record for the zone.