单项选择题 In a Windows Server 2003 environment using PKI， a user encrypts several documents on a shared file server. That user account is then accidentally deleted.  Which of the following must be configured inorder to decrypt those files？（）

单项选择题 A new server was installed. Most clients are located in the same subnet as the server and can successfully access the server. Clients located on different subnets have been unable to access the server， but have no trouble accessing other servers on their subnet.  Which of the following is the reason that these clients are unable to access the server？（）

单项选择题 A server is connected to a gigabit Ethernet switch and has negotiated 1Gbps / Full Duplex. When transferring large files to and from other servers on the segment via FTP slow performance is noticed.All network cabling，network hardware and server hardware were verified to be working correctly.  Which of the following could be done to improve performance？（）