单项选择题
A.Single-rate， two-color marker
B.Three-rate， two-color marker
C.Two-rate， three-color marker
D.Single-rate， three-color marker
单项选择题 Beforeinsertinganewswitchinthenetwork，thenetworkadministratorchecksthattheVTPdomainnameiscorrect，theVTPmodeissettoserver，andrevisionislowerthantheswitchesinthenetwork.Theadministratorthenconfiguresinterfacesandtrunks，erasesexistingVLANs，andconnectstheswitchtothenetwork.Followingthatprocedure，thereisnoconnectivityinthenetwork.Whatisapossiblecauseofthisproblem？（）
问答题 简述组播地址范围。
多项选择题 TheEtherChannelbetweenyourLANswitchandtheInternetrouterisnotload-balancingefficiently.Ontheswitch，thereareseveralworkstationswithvalidIPranges.Whichload-balancealgorithmscanyouuseintheswitchinordertooptimizethisloadbalancing？（）
