问答题

共用题干题AstuteserviceprovidersrealizethatthecontinuedsupportoflegacyX.25andasynchronousnetworkelementusingseparateoperationsnetworkiscost(16).Forexample,themaintenanceofmultiplenetworkscanrequireadditionalstaff.Often,thisstaffmustbetrainedonmultiplevendortechnologies,sometimesrequiringparallelgroupsspecializingineach(17).Hence,additionalmaintenanceproceduresmustbemaintainedandadministrativerecordsare(18).Theduplicationoftransportfacilitiestocarry(19)networktrafficisaninefficientuseofresources.Andnotsurprisingly,moretechnologiesinstalledinacentralofficemeansthenecessityformorephysicalspace,andanincreaseinpowerconnectionsandpowerconsumptionmigrationofthese(20)networkelementstoIP-basedDCnsisalogicalstrategy.
空白处（18）应选择（）
A.declined
B.proliferated
C.destroyed
D.produced

A.25andasynchronousnetworkelementusingseparateoperationsnetworkiscost(16).Forexample,themaintenanceofmultiplenetworkscanrequireadditionalstaff.Often,thisstaffmustbetrainedonmultiplevendortechnologies,sometimesrequiringparallelgroupsspecializingineach(17).Hence,additionalmaintenanceproceduresmustbemaintainedandadministrativerecordsare(18).Theduplicationoftransportfacilitiestocarry(19)networktrafficisaninefficientuseofresources.Andnotsurprisingly,moretechnologiesinstalledinacentralofficemeansthenecessityformorephysicalspace,andanincreaseinpowerconnectionsandpowerconsumptionmigrationofthese(20)networkelementstoIP-basedDCnsisalogicalstrategy.
空白处（18）应选择（）
A.declined
B.proliferated
C.destroyed
D.produced

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单项选择题

WhichmechanismdotheCNAandtheCiscoNexus5000SeriesSwitchesusetoprovidealosslessclassofEthernettraffic？（）

A.LLDP
B.LACP
C.PFC
D.FIP

问答题

共用题干题Whenthesystemuponwhichatransportentityisrunningfailsandsubsequentlyrestarts,the(21)informationofallactiveconnectionsislost.Theaffectedconnectionsbecomehalf-open,asthesidethatdidnotfaildoesnotyetrealizetheproblem.Thestillactivesideofahalf-openconnectionscanclosetheconnectionusinga(22)timer.Thistimermeasuresthetimethetransportmachinewillcontinuetoawaitan(23)ofatransmittedsegmentafterthesegmenthasbeenretransmittedthemaximumnumberoftimes.Whenthetimer(24),thetransportentityassumesthateithertheothertransportentityortheinterveningnetworkhasfailed.Asaresult,thetimerclosestheconnection,andsignalsanabnormalclosetotheTSuser.Intheeventthatatransportentityfailsandquicklyrestarts,half-openconnectionscanbeterminatedmorequicklybytheuseoftheRSTsegment,thefailedsidereturnsanRSTitoeverysegmentithatitreceives.WhentheRSTireachestheotherside,itmustbecheckedforvaliditybasedonthe(25)numberi,astheRSTcouldbeinresponsetoanoldsegment.Iftheresetisvalid,thetransportentityperformsanabnormaltermination.
空白处（22）应选择（）
A.give-up
B.abandon
C.quit
D.connection

A.Theaffectedconnectionsbecomehalf-open,asthesidethatdidnotfaildoesnotyetrealizetheproblem.Thestillactivesideofahalf-openconnectionscanclosetheconnectionusinga(22)timer.Thistimermeasuresthetimethetransportmachinewillcontinuetoawaitan(23)ofatransmittedsegmentafterthesegmenthasbeenretransmittedthemaximumnumberoftimes.Whenthetimer(24),thetransportentityassumesthateithertheothertransportentityortheinterveningnetworkhasfailed.Asaresult,thetimerclosestheconnection,andsignalsanabnormalclosetotheTSuser.Intheeventthatatransportentityfailsandquicklyrestarts,half-openconnectionscanbeterminatedmorequicklybytheuseoftheRSTsegment,thefailedsidereturnsanRSTitoeverysegmentithatitreceives.WhentheRSTireachestheotherside,itmustbecheckedforvaliditybasedonthe(25)numberi,astheRSTcouldbeinresponsetoanoldsegment.Iftheresetisvalid,thetransportentityperformsanabnormaltermination.
空白处（22）应选择（）
A.give-up
B.abandon
C.quit
D.connection