多项选择题 Your company uses Active Directory-integrated DNS. Users require access to the Internet. You run a network capture. You notice the DNS server is sending DNS name resolution queries to a server named f.root-servers.net. You need to prevent the DNS server from sending queries to f.root-servers.net. The server must be able to resolve names for Internet hosts. Which two actions should you perform？（）

单项选择题 Your network consists of a single Active Directory domain. The domain contains a server named Server1 that runs Windows Server 2008 R2. All client computers run Windows 7. All computers are members of the Active Directory domain. You assign the Secure Server (Require Security) IPsec policy to Server1 by using a Group Policy object (GPO). Users report that they fail to connect to Server1. You need to ensure that users can connect to Server1. All connections to Server1 must be encrypted. What should you do？（）

单项选择题 Your network contains one Active Directory domain. You have a member server that runs Windows Server 2008 R2.You need to immediately disable all incoming connections to the server. What should you do？（）