单项选择题 You are the network administrator for your company. The network consists of a single Active Directory domain. All servers run Windows Server 2003. All client computers run Windows XP Professional.You install Windows Server Update Services （WSUS） on a network server named Server1. When you attempt to synchronize Server1 with the Windows Update servers， you receive an error message. You open Internet Explorer and verify that you can communicate with an external Web site by using the proxy server. You need to ensure that Server1 can communicate with the Windows Update servers. What should you do on Server1？（）

多项选择题 You are the network administrator for your company. The network consists of a single Active Directory domain. All servers run Windows Server 2003. All client computers run Windows XP Professional. You need to implement a new software update infrastructure.  You discover that security patches， critical updates， and service packs have never been installed on any client computer on the network. You install Windows Server Update Services （WSUS） on a Windows Server 2003 computer named Server5. You synchronize and approve all of the current security patches， critical updates， and service packs. You need to ensure that all client computers receive all Microsoft security patches， critical updates， and service packs.  Which two actions should you perform？（）

单项选择题 You are the network administrator for your company. The network consists of a single Active Directory domain. The domain contains 35 Windows Server 2003 computers； 3，000 Windows XP Professional computers； and 2，000 Windows 2000 Professional computers.Windows Server Update Services （WSUS） is installed on a server named Server1. The necessary Group Policy object （GPO） is configured.You need to confirm whether all computers in the domain have received all approved updates from Server1.  What should you do on Server1？（）