单项选择题 Your company uses network access protection (NAP) to enforce policies on client computers that connect to the network. Client computers run windows vista. A group Policy is used to configure client computers to obtain updates from WSUS. Company policy requires that updates labeled important and critical must be applied before client computers can access network resources. You need to ensure that client computes meet the company policy requirement. What should you do?（）

单项选择题 our company has a DNS server named server1. Your partner company has a DNS server named server2. You create a stub zone on server1. The master for the stub zone is server2. Serve2 fails. You discover that users are not able to resolve named for the partner company. You need to ensure that users are able to resolve named for the partner company in the event that server2 fails. What should you do?（）

单项选择题 Your network contains an Active Directory domain. The domain contains a DHCP server named Server1.You create a scope named Scope1 on Server1.You need to prevent unauthorized DHCP clients from receiving addresses from Server1.What should you do？（）