多项选择题
A. dial plans
B. dialed numbers
C. voice mail prompts
D. phone features
单项选择题 Whichofthesestatementsistrueofroutingprotocolsinahub-and-spokeIPsecVPNtopology？（）
单项选择题 Whendealingwithtransparentcaching，whereshouldtheContentEnginesbeplaced？（）
单项选择题 TheVPNterminationfunctionprovidestheabilitytoconnecttwonetworkstogethersecurelyovertheinternet.WhichoftheseistrueofIPaddressingwithregardtoVPNtermination？（）