单项选择题 You want to configure your Windows 2000 Professional computer to remotely access your companys Windows 2000 Routing and Remote Access server. You configure a VPN connection. For security purposes, you configure the VPN connection to use MS-CHAP v2 only and to require encryption. You also configure TCP/IP to obtain an IP address automatically, to enable IPSec, and to set IPSec to Secure Server.  When you try to connect, you receive the following error message, "The encryption attempt failed because no valid certificate was found."  What should you do to connect to the server? （）

单项选择题 You are the network administrator for ExamSheet.net.  Two users, Peter and Keith, share a Windows 2000 Professional computer. The computer remains logged on with a shared user account named Kiosk at all times. Peter has limited dexterity, which prevents him from using the standard keyboard when completing his daily computing tasks. You configure his Windows 2000 Professional computer to use on-screen keyboard and ToggleKeys option. You have the accessibility option settings to the desktop. Keith does not want to use the on-screen keyboard when he uses the computer. You need to enable both users to quickly switch between their preferred settings. What should you do?（）

单项选择题 You are a network administrator for ExamSheet.nets Windows 2000 network.  The purchasing department has recently purchased 10 new computers. Each computer has a fax modem. You create an NTFS volume and install Windows 2000 Professional on the computers. You then install the Fax service with the default values and settings. Users report that when they attempt to fax a document by using the fax printer that is installed, the document does not fax. You want users to be able to fax documents.  What should you do?（）