单项选择题 You are the administrator of your company’s network. You use your Windows 2000 Professional computer to transfer 20 large files. Each file is 100 MB in size. You want to copy the files from a UNIX server in your branch office to a computer running  Microsoft SQL Server at the main office.  When you copy the files by using Windows Explorer, the connection appears to time out and the  file copy is aborted. You suspect that you are encountering a TCP/IP performance problem. Your network connection is shown in the Xircom LAN Properties dialog box in the exhibit. You want to monitor the performance of TCP/IP of your computer. What should you do? （）

单项选择题 You configure you Windows 2000 Professional computer for Internet connection Sharing and for TCP/IP filtering as shown in the exhibit.(Click the Exhibit button.) You test your TCP/IP filtering configuration from another client computer. You can access Web sites, but you cannot access FTP sites.   What should you do to be able to access FTP sites?（）

单项选择题 You install Windows 2000 Professional on a computer named Client2. The network is configured as shown in the Network Configuration exhibit.(Click the Exhibit button).  You connect to shared resources on ServerE daily. Today, you cannot connect to ServerE. Heather can connect to ServerE successfully from her computer. You ping ServerE to find out the nature of the problem as shown in the Ping Results exhibit.(Click the Exhibit button.) You verify that all of the servers are connected to the network and are running correctly. What is the most likely cause of the problem?（）