多项选择题
Which of the following troubleshooting targets is considered to be a Layer 2 issue？（Choose allthat apply.）（）
A.Spanning Tree Protocol B.Cabling C.Frame forwarding D.Packet forwarding E.EtherChannel F.Routing protocols
多项选择题 Whichofthefollowingareconsideredcommonelementsfoundinasetofnetworkdocuments？（Chooseallthatapply.）（）
单项选择题 ArouterhasbeenconfiguredwithanEIGRPvarianceof3.Whichofthefollowingstatementsistrue？（）
单项选择题 WhichofthefollowingcharacteristicsappliesonlytoOSPFv3andnottoOSPFv2？（）
