单项选择题

Toinitiatetesting，whichportdoesaCiscoIOSIPSLAsourceusetosendacontrolmessagetoanIPSLAresponder？（）

A.UDPport2020
B.UDPport1967
C.TCPport2020
D.ICMPport1967
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单项选择题
WhatwilloccurwhenanonedgeswitchportthatisconfiguredforRapidSpanningTreedoesnotreceiveaBPDUfromitsneighborforthreeconsecutivehellotimeintervals？（）
A.RSTPinformationisautomaticallyagedout.
B.TheportsendsaTCNtotherootbridge.
C.Theportmovestolisteningstate.
D.Theportbecomesanormalspanningtreeport.
单项选择题
Duringroutinemaintenance，G1 0 1onDS1wasshutdown.Allotherinterfacewereup.DS2becametheactiveHSRPdeviceforVlan101asdesired.However，afterG1 0 1onDS1wasreactivated.DS1didnotbecometheactiveHSRPdeviceasdesired.WhatneedtobedonetomakethegroupforVlan101functionproperly？（）A.EnablepreemptonDS1’sVlan101HSRPgroupB.DisablepreemptonDS1’sVlan101HSRPgroupC.DecreaseDS1’spriorityvalueforVlan101HSRPgrouptoavaluethatislessthanpriorityvalueconfiguredonDS2’sHSRPgroupforVlan101D.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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