多项选择题
A.console password
B.vty password
C.aux password
D.tty password
E.enable secret password
F.username password
多项选择题 TheOSPFHelloprotocolperformswhichofthefollowingtasks?(Choosetwo.)（）
多项选择题 AnetworkadministratorwantstoensurethatonlytheservercanconnecttoportFa0/1onaCatalystswitch.TheserverispluggedintotheswitchFa0/1portandthenetworkadministratorisabouttobringtheserveronline.WhatcantheadministratordotoensurethatonlytheMACaddressoftheserverisallowedbyswitchportFa0/1?（）
多项选择题 AtwhichlayersoftheOSImodeldoWANsoperate?(Choosetwo.)（）