单项选择题 Your network contains a single Active Directory domain named contoso.com.You have a domain controller named DC1 that runs Windows Server 2003 Service Pack 2 （SP2） that has the DNS Server Windows component installed.  You have a member server named Server1 that runs Windows Server 2003 SP2.Server1 fails to update its host （A） record for the contoso.com domain. You need to verify that DNS requests from Server1 are sent to DC1.  What should you do？（）

单项选择题 You have a DNS server that runs Windows Server 2003 Service Pack 2 （SP2）. The server contains two zones named nwtraders.com and contoso.com. Nwtraders.com is configured as an Active Directory-integrated zone. Contoso.com is configured as a standard primary zone.  You discover that stale resource records are not being removed from contoso.com. Stale resource records are being removed from nwtraders.com. You need to ensure that stale resource records are automatically removed from contoso.com.  What should you do？（）

单项选择题 Your network consists of a single Active Directory forest that contains two domains named contoso.com and litwareinc.com. All domain controllers for contoso.com are in an office located in Singapore. All domain controllers for litwareinc.com are in an office located in Los Angeles.  There is a single 128-Kbps WAN link between the two offices.All domain controllers run Windows Server 2003 Service Pack 2 （SP2） and are configured as DNS servers. Each domain controller contains a standard DNS zone for its respective domain.You need to ensure that users in the Singapore office can resolve IP addresses for servers in the Los Angeles office. The solution must minimize replication traffic over the WAN link.  What should you do？（）