多项选择题
A.An update packet with init flag set from a known， already established neighbor relationship was received by one of the routers.
B.The ARP cache was cleared.
C.The counters were cleared.
D.The IP EIGRP neighbor relationship was cleared manually.
多项选择题 WhichtwooftheseelementsneedtobeconfiguredpriortoenablingSSH？（）
多项选择题 ThenetworkadministratorwantstoenableanEtherChannelbetweentwoswitchesin"on"mode.Theadministratorconnectsthecablesandenablestheinterfaces，butwhileconfiguringtheEtherChannelinthefirstswitch，aspanning-treeloopwasdetected.Whichtwooftheseprocedurescanavoidthisproblem？（）
多项选择题 ourcompanyisresearchinganewapplicationthatrunsoverIPv6，butpartofitmuststillhaveIPv4support.YourcompanyusesatraditionalIPv4network.YourplanisnottorunIPv6overthewholenetwork，buttosegmentpartsofthenetworkoreventooperatesimultaneouslywithIPv6andIPv4.YoumustmakeabriefpresentationaboutIPv6technologytotheboardoftechnicaldirectors.Whichthreeoftheseitemscouldbepartofyourpresentation？（）