单项选择题 Beforeinsertinganewswitchinthenetwork，thenetworkadministratorchecksthattheVTPdomainnameiscorrect，theVTPmodeissettoserver，andrevisionislowerthantheswitchesinthenetwork.Theadministratorthenconfiguresinterfacesandtrunks，erasesexistingVLANs，andconnectstheswitchtothenetwork.Followingthatprocedure，thereisnoconnectivityinthenetwork.Whatisapossiblecauseofthisproblem？（）

多项选择题 TheEtherChannelbetweenyourLANswitchandtheInternetrouterisnotload-balancingefficiently.Ontheswitch，thereareseveralworkstationswithvalidIPranges.Whichload-balancealgorithmscanyouuseintheswitchinordertooptimizethisloadbalancing？（）

单项选择题 Refer to the exhibit. What type of issue does this error log indicate if the IP address in the error log is located off of the Router A WAN?（）