单项选择题

WhichspanningTreeProtocolhasbeenimplementedonswitch2？（）

A.STP/IEEE802.1D
B.MSTP/IEEE802.1s
C.PVST+
D.PVRST
E.Noneoftheotheralternativesapply
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单项选择题
WhichportrolehasinterfaceFa0／2ofswitch1adoptedforVLAN47？（）
A.Rootport
B.Nondesignedport
C.Designatedport
D.Backupport
E.Alternateport
F.Noneoftheotheralternativesapply
单项选择题
Thefollowingwasconfiguredonaswitch：Switch（config）spanning－treeportfastbpdufilterdefaultWhatistheeffectofthisconfigurationcommand？（）
A.IfBPDUsarereceivedbyaportconfiguredforPortFast，theyareignoredandnonearesent.
B.ThecommandwillenableBPDUfilteringonallportsregardlessofwhethertheyareconfiguredforBPDUfilteringattheinterfacelevel.
C.IfBPDUsarereceivedbyaportconfiguredforPortfast，theportwilltransitiontoforwardingstate.
D.IfBPDUsarereceivedbyaportconfiguredforPortFast，thenPortFastisdisabledandtheBPDUsareprocessednormally.
E.Noneoftheotheralternativesapply.
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