问答题
简述组播的sparse和dense的区别。
dense mode :implicit joins,use flo......
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单项选择题 Whichstandardsupportsmultipleinstancesofspanningtree?()
多项选择题 LoopguardandUniDirectionalLinkDetectionbothprotectagainstLayer2STPloops.InwhichtwowaysdoesloopguarddifferfromUDLDinloopdetectionandprevention?()
问答题 what’s IOS command , you can see the output as below