单项选择题 在WINDOWS2000资源管理器中,文件夹前的”＋”号表示( )

未知题型 hostnameSwitch1interfaceVlan10ipaddress172.16.10.32255.255.255.0noipredirectsstandby1ip172.16.10.110standby1timers15standby1priority130hostnameSwitch2interfaceVlan10ipaddress172.16.10.33255.255.255.0noipredirectsstandby1ip172.16.10.110standby1timers15standby1priority120HSRPwasimplementedandconfiguredontwoswitcheswhileschedulednetworkmaintenancewasperformed.Afterthetwoswitcheshavefinishedrebooting，younoticeviashowcommandsthatSwitch2istheHSRPactiverouter.WhichtwoitemsaremostlikelythecauseofSwitch1notbecomingtheactiverouter？（）

未知题型 WhichtwostatementscorrectlydescribeUDLD？（）