单项选择题 Whatkeywordsdoyouneedtotheaccess-listtoprovidetotheloggingmessagelikesourceaddressandsourcemacaddress?()
单项选择题 Whiledeployinganewswitch,youaccidentlyconnectports3/12and3/18together,creatingaloop.STPdetecteditandplacedport3/18inblockingmode.WhydidSTPnotplaceport3/12inblockingmodeinstead?()
问答题 第二条rate-limit的作用是什么?