单项选择题
A. Port 3/12 was already up and forwarding before the loop was created.
B. Port priority is based on lowest priority and lowest port number.
C. You connected the wire on port 3/18 last.
D. None of the above， it is purely random.
单项选择题 AfterapplyinganewACLonadevice，itsCPUutilizationrosesignificantlyandmanymessagesstartingwith"%SEC-6-IPACCESSLOG"appearedontheSyslogserver.Whatcanbedonetoresolvethissituation？（）
单项选择题 Youdeployednewfibersinyournetworktoreplacecopperspansthatweretoolong.Whilereconnectingthenetwork，youexperiencednetworkproblemsbecauseyoureconnectedwrongfiberstowrongports.Whatcouldyoudotopreventthistypeofprobleminthefuture，particularlywhenconnectingandreconnectingfiberpairs？（）
单项选择题 WhichfeaturewouldpreventguestusersfromgainingnetworkaccessbyunplugginganIPphoneandconnectingalaptopcomputer？（）