单项选择题 You have DNS server named DC1 that runs Windows Server 2003 Service Pack 2 （SP2）. DC1 hosts an Active Directory-integrated zone that has dynamic updates enabled.  You enable aging and scavenging for the zone.You discover that stale records are not being removed from the zone. You need ensure that stale records are removed from the zone.  What should you do？（）

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？（）