单项选择题

Duringroutinemaintenance，G1/0/1onDS1wasshutdown.Allotherinterfacewereup.DS2becametheactiveHSRPdeviceforVlan101asdesired.However，afterG1/0/1onDS1wasreactivated.DS1didnotbecometheactiveHSRPdeviceasdesired.WhatneedtobedonetomakethegroupforVlan101functionproperly？（）
A.EnablepreemptonDS1’sVlan101HSRPgroup
B.DisablepreemptonDS1’sVlan101HSRPgroup
C.DecreaseDS1’spriorityvalueforVlan101HSRPgrouptoavaluethatislessthanpriorityvalueconfiguredonDS2’sHSRPgroupforVlan101
D.DecreasethedecrementinthetrackcommandforDS1’sVlan101HSRPgrouptoavaluelessthanthevalueinthetrackcommandforDS2’sVlan101HSRPgroup.

A.Allotherinterfacewereup.DS2becametheactiveHSRPdeviceforVlan101asdesired.However，afterG1/0/1onDS1wasreactivated.DS1didnotbecometheactiveHSRPdeviceasdesired.WhatneedtobedonetomakethegroupforVlan101functionproperly？（）
A.EnablepreemptonDS1’sVlan101HSRPgroup
B.DisablepreemptonDS1’sVlan101HSRPgroup
C.DecreaseDS1’spriorityvalueforVlan101HSRPgrouptoavaluethatislessthanpriorityvalueconfiguredonDS2’sHSRPgroupforVlan101
D.DecreasethedecrementinthetrackcommandforDS1’sVlan101HSRPgrouptoavaluelessthanthevalueinthetrackcommandforDS2’sVlan101HSRPgroup.
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单项选择题
AportinaredundanttopologyiscurrentlyintheblockingstateandisnotreceivingBPDUs.Toensurethatthisportdoesnoterroneouslytransitiontotheforwardingstate，whichcommandshouldbeconfiguredtosatisfytherequirement？（）A.Switch（config）#spanning-treeloopguarddefaultB.Switch（config-if）#spanning-treebdpufilterC.Switch（config）#udldaggressiveD.Switch（config-if）#spanning-treebpduguard
A.Toensurethatthisportdoesnoterroneouslytransitiontotheforwardingstate，whichcommandshouldbeconfiguredtosatisfytherequirement？（）
A.Switch（config）#spanning-treeloopguarddefault
B.Switch（config-if）#spanning-treebdpufilter
C.Switch（config）#udldaggressive
D.Switch（config-if）#spanning-treebpduguard
单项选择题
WhichspanningTreeProtocolhasbeenimplementedonswitch2？（）
A.STP/IEEE802.1D
B.MSTP/IEEE802.1s
C.PVST+
D.PVRST
E.Noneoftheotheralternativesapply
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