地方性甲状腺肿的病因是由于A．B．C．D．E．

A.toacoreswitchrunningCiscoNSFandSSOfromredundantdistributionswitchesconnected withaLayer2link

B.toacoreswitchrunningCiscoNSFandSSOfromredundantdistributionswitchesconnected withaLayer3link

C.totwocoreswitchesfromredundantdistributionswitchesconnectedwithLayer2link

D.totwocoreswitchesfromredundantdistributionswitchesconnectedwithLayer3link

E.totwocoreswitchesrunningCiscoNSFandSSOfromtworedundantdistributionswitches runningCiscoNSFandSSO

A.CSU/DSU

B.调制解调器

C.DSL路由器

D.NT1设备

E.ISDN调制解调器

A.Ifnocorelayerisdeployed，thedesignwillbeeasiertoscale

B.Adedicatedcampuscorelayershouldbedeployedforconnectingthreeormorebuildings

C.Ifnocorelayerisdeployed，thedistributionswitchesshouldnotbefullymeshed

D.Adedicatedcampuscorelayerisnotneededforconnectingfewerthanfivebuildings

A.GRE

B.8021Q

C.MPLS

D.L2TPv3

A.Itwillonlybecomeactiveafterasoftwarefailure

B.Itwillonlybecomeactiveafterahardwarefailure

C.ItrequiresthatCiscoN3F·beenabledinordertoworksuccessfully

D.ItsynchronizestheMAC·，FIB·，andadjacencytablesbetweenActiveandStandbyRoute Processors

A.Theyareknownasfabricrouting

B.Theycannotspanmultipleswitches

C.TheirconnectivityissupportedbyLayer2

D.TheyenabledevicesindifferentVSANfabricstocommunicate

E.Theyrequirethatmultipleswitchfabricsbemergedbeforetheycanfunction

A.aWDMsystemthatiscompatiblewithEDFAtechnology

B.anopticaltechnologyfortransmittingupto16channelsovermultiplefiberstrands

C.anopticaltechnologyfortransmittingupto32channelsovermultiplefiberstrands

D.atechnologyfortransmittingmultipleopticalsignalsusinglesssophisticatedtransceiverdesignthenCWDM

E.atechnologyfortransmittingmorecloselypackedopticalsignalsusingmoresophisticatedtransceiverdesignsthanCWDM

A.OffloadstheSTPrequirementfromtheexternalAccesslayerswitches

B.IfupstreamaccessswitchesdonotsupportvPCorVSSthedual-homedESXhosttrafficcanstillbedistributedusingvirtualportchannelhostmodeusingsubgroupsautomaticallydiscoveredthroughCDP

C.AllowtransittraffictobeforwardedthroughtheESXhostbetweenVMNICs

D.Canbedividedintomultiplevirtualdevicecontextsforserviceintegration，enhancedsecurity，administrativeboundaries，andflexibilityofdeployment

A.A

B.B

C.C

D.D

E.E

A.routedmode

B.contextmode

C.bridgedmode

D.transparentmode

E.fullsecuritymode