单项选择题 Whatisanimportantconsiderationthatshouldbetakenintoaccountwhenconfiguringshapedroundrobin？（）
问答题 howmanyneighborcommandsrequiredforestablishibgppeersin4routers？
多项选择题 ThenetworkadministratorwantstoenableanEtherChannelbetweentwoswitchesin"on"mode.Theadministratorconnectsthecablesandenablestheinterfaces，butwhileconfiguringtheEtherChannelinthefirstswitch，aspanning-treeloopwasdetected.Whichtwooftheseprocedurescanavoidthisproblem？（）