多项选择题 A network administrator is explaining VTP configuration to a new technician. What should the network administrator tell the new technician about VTP configuration?（）

多项选择题 Before installing a new, upgraded version of the IOS, what should be checked on the router, and which command should be used to gather this information?（）

多项选择题 What can be done to secure the virtual terminal interfaces on a router?（）