You are the network administrator for ExamSheet. 
You create a dial-up connection to your Internet service provider (ISP). You configure the dial-up connection Security tab as shown in the Dial-up Security Dialog Box. 
You attempt to connect to the ISP. You view the status change from Dialing to Verifying user name and password. After several seconds, the status changes to Disconnecting. You are then disconnected from the computer you dialed. You verify that your user name and password are entered correctly. You want to enable your computer to connect to your ISP.  
What should you do? 
 

You want to configure your Windows 2000 Professional computer to remotely access your company's 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? （）