单项选择题 Your company has active directory certificate services (AD CS) and network access protection (NAP) deployed on the network. You need to ensure that NAP policies are enforced on portable computers that use a wireless connection to access the network. What should you do?（）

单项选择题 Your network contains two DHCP servers named Server1 and Server2.On Server1, you create a scope named Scope1.You need to ensure that DHCP clients receive IP addresses from the address range in Scope1 if Server1 is unavailable. The solution must prevent both servers from assigning duplicate IP addresses.What should you do from the DHCP console？（）

单项选择题 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?（）