YoudeploymobiledevicesthatrunMicrosoftWindowsMobile5.0.AMicrosoftWindowsServer2003serverthatrunsRoutingandRemoteAccessisconfiguredtoallowvirtualprivatenetwork（VPN）connectionsthatareassecureaspossible.YouneedtoconnecttheWindowsMobilebaseddevicestotheVPNserver.YoualsoneedtoensurethatbothendsoftheVPNtunnelareauthenticated.Whichtwoactionsshouldyouperform？（）
A.SelectL2TP\/IPSeconeachWindowsMobilebaseddevice.
B.ObtainandinstallacertificateoneachWindowsMobilebaseddevice.
C.Configuretheappropriatepre-sharedkeyoneachWindowsMobilebaseddevice.
D.SelectPoint-to-PointTunnelingProtocol（PPTP）oneachWindowsMobilebaseddevice.
参考答案：AB
