CCNP(642311)真题精选.docx
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CCNP(642311)真题精选.docx
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CCNP(642-311)真题精选
[单项选择题]
1、YouareinstallingaCiscoONS15454inaserviceprovider
site.ADS3cableistobeconnectedtoadigitalcross-connect
system.Whatisthemaximumdistanceallowedbetweenthetwo?
()
A.225ft
B.450ft
C.655ft
D.900ft
参考答案:
B
[单项选择题]
2、WithR4.0,howmanytotalDCCtunnelconnectionscaneachONS15454supportusingtheTCC+card?
()
A.10
B.32
C.64
D.84
E.96
参考答案:
B
[多项选择题]
3、WhichthreetimingmodesaresupportedontheONS15454shelf?
()
(Choose
three.)
A.linetiming
B.looptiming
C.internaltiming
D.throughtiming
E.externaltiming
参考答案:
A,C,E
[单项选择题]
4、ClicktheExhibit
button.IntheDCNconnectionshownintheexhibit,allnon-GNEnodesarelocatedondifferentsubnetsfromthe
GNE.TherearenostaticroutesorexternalOSPFonany
elements.CTCWorkstationandGNEhaveCiscoRouterastheirdefault
gateway.CantheCTCworkstationseetheentireSONETnetwork?
()
A.Yes,butonlyifOSPFisenabledaroundthe
ring.
B.Yes,becausetheGNEwillonlyserveasaproxy-ARPforelementsonthesame
subnet.
C.Yes,butonlyiftherouter'saddressisenteredasastaticrouteinthenon-GNE
elements.
D.Yes,becausetheGNEwillserveasaproxy-ARPforallelements,regardlessoftheir
subnets.
参考答案:
A
[多项选择题]
5、Whataretwocharacteristicsofdual-ringinterconnectinSONETnetworks?
()
(Choose
two.)
A.Itprotectssignalsagainstnodefailuresbetween
rings.
B.Itprotectssignalsagainstnodefailurewithinasingle
ring.
C.Itallowsfortraffictobepreemptedwhenaringswitch
occurs.
D.Trafficcanbedroppedandcontinuedatinterconnecting
nodes.
E.Itprotectspreemptibletrafficfrombeingdroppedwhenaringswitch
occurs.
参考答案:
A,D
[单项选择题]
6、WhatisthecorrectrelativeswitchingpriorityinaBLSRring(highertolower)?
()
A.signalfail,signaldegrade,manualswitch
B.signaldegrade,signalfail,manualswitch
C.protectionlockout,manualswitch,pathAIS
D.forcedswitch,manualswitch,signaldegrade
E.protectionlockout,manualswitch,forcedswitch
参考答案:
A
[单项选择题]
7、YouareprovisioningaDS-1circuitonanONS15454UPSRconfigurationandXC-10G
card.HowmanytotalVTportsareusedwithintheVTmatrixatthesourcenode?
()
A.0
B.1
C.2
D.3
E.4
参考答案:
D
[单项选择题]
8、Acustomerwantstocreatea
1:
1protectiongroupwithaDS3N-12
card.Whichcardslotswouldallowfora
1:
1protection?
()
A.Slot2andSlot4
B.Slot4andSlot6
C.Slots5or13only
D.Slot16andSlot17
参考答案:
D
[单项选择题]
9、Acustomerhas2DS1stoaddbetweenadjacentnodesinaUPSR
ring.Whattypeofcircuitshouldyourecommend?
()
A.VTcircuits
B.STScircuits
C.VTtunnelcircuits
D.1:
1protectioncircuits
E.1:
Nprotectioncircuits
参考答案:
A
[单项选择题]
10、YouareprovisioningaDS-1circuitonanONS154542F-BLSRwithaXC-10G
card.EachVT1.5connectionmustalsoterminateviatheSTS
matrix.Ontheoriginatingcircuitnode,howmanySTSportsarenowavailableforVT1.5circuits?
()
A.2
B.3
C.4
D.20
E.22
F.24
参考答案:
E
[单项选择题]
11、TheML-seriesEthernetcardontheONS15454providesupto()activeQ-in-Qinstancesper
card.
A.255
B.512
C.1024
D.4096
参考答案:
A
[单项选择题]
12、ScramblingofSONETsignalsisdoneto().
A.preventtheleakageofexternalfiberemissions
B.providetheopticalnetworkwiththehighestlevelofsecuritypossible
C.assureanevendistributionof1'sand0'sforextendedtransmitterlife
D.assureanadequatenumberoftransitionsforclockrecoveryatthereceiver
E.preventthereceiverfromassumingAISinadvertentlywhenall0'sarereceived
参考答案:
D
[单项选择题]
13、Ifnode2isacceptinglinetimingfromnode1,node2willsend()tonode1asitsSSM
message.
A.ESF
B.PRS
C.DUS
D.SMC
E.B8ZS
参考答案:
C
[单项选择题]
14、WhichtimingmodeisappropriateforaSONETNEthatisadjacenttoaSONETNEusingBITS-1timingsource?
()
A.DUS
B.linetiming
C.looptiming
D.internaltiming
E.throughtiming
参考答案:
B
[单项选择题]
15、Whichisalegitimatebandwidthmatchedpair?
()
A.DS-1;
E1
B.DS-1;
STM-1
C.OC-3;
STM-1
D.STS-1;
STM-1
E.OC-192;
STM-192
参考答案:
C
[单项选择题]
16、HowisUPSRandBLSRtrafficreroutedduringaprotectionswitchwhenacompletefibercablecutoccurs?
()
A.TrafficisswitchedfromthefirstnodereceivingtheAIS
indication.
B.Trafficisswitchedfromthefarsideofthefailure,allowinghandshakingto
occur.
C.UPSRtrafficisswitchedfromtheterminatingnode,BLSRtrafficisreroutedfromtheoriginatingnodeinthe
ring.
D.UPSRtrafficisswitchedfromtheterminatingnode,circuitby
circuit.BLSRtrafficisreroutedfromthelastreachablenodeinthe
ring.
参考答案:
D
[单项选择题]
17、InordertoavoidmisconnectionsduetoafailednodeinaBidirectionalLineSwitchedRing(BLSR),AlarmIndicationSignals(AISs)aresentoneverychannelnormallyterminatinginthat
node.Whatisthenameofthisprocess?
()
A.trunking
B.squelching
C.nodalbypass
D.bridgeandroll
E.nodefailureinsertion
参考答案:
B
[单项选择题]
18、UPSRprotectionswitchingisinitiatedby(),whileBLSRisinitiatedby().
A.theK1SONETbyte;
theK2SONETbyte
B.theK2SONETbyte;theK1SONETbyte
C.transmitterswitching;receiverdetection
D.LineOverheadbytes;PathOverheadbytes
E.PathOverheadbytes;LineOverheadbytes
参考答案:
E
[多项选择题]
19、ClicktheExhibit
button.Theexhibitshowsa15454/15216DWDMsystemandalarm
indications.Whataretwopossiblesourcesoftroubleshowninthesystem?
()(Choose
two.)
A.fiberfailurebetweenSitesAandd
B.EDFAfailureatSiteA(clockwisedirection)
C.EDFAfailureatSiteC(clockwisedirection)
D.15216multiplexeratSiteA(counter-clockwisedirection)
E.OADMpass-through(West"OUT")failureatsiteD(clockwise)
F.wavelengths1and3transmitterfailuresatSiteA(clockwisedirection)
参考答案:
A,B
[单项选择题]
20、TheONS15216isa32-channel
system.TheONS15216OADMsarecapableofaddinganddroppingone,two,orfour
channels.HowaretheOADMsprovisionedtoaddanddropspecificchannels?
()
A.TheONS15216OADMcanbeprovisionedtoadd/dropone,two,orfourchannelsviaCiscoTransportManager(CTM).
B.TheONS15216OADMconsistsonlyofafour-channelmodule,andthenumberofportsutilizeddetermineswhetheritisaone,two,orfourchannel
OADM.
C.ThreeseparateOADMmodulesareavailableforone,two,andfour
channels.ThewavelengthstobedroppedandaddedareprogrammableviaCiscoTransportManager(CTM).
D.TheONS15216OADMconsistsonlyofasingle-channel
module.Twochannelandfour-channelsupportisavailablebystackingthesinglechannel
module.
E.TheONS15216OADMisavailableinone,two,four
channels.Thereare32single-channelOADMmodules,16two-channelOADMmodules,and8four-channelOADM
modules.
参考答案:
E
[多项选择题]
21、Whataretwoimportantconsiderationswhenusing2-or4-channel15216OADMs?
()(Choose
two.)
A.All"Add"
channelsrequireuniformpower
levels.
B.TheflexibilityofwavelengthsperOADMis
limited.
C.Itiseasiertobalance"Pass-Through"
and"Add"
channels.
D.Thereislowerpass-throughlossusingmulti-channel
OADMs.
E.Youcanextractasinglechannelwithoutdroppingother
channels.
参考答案:
A,B更多内容请访问《睦霖题库》微信公众号
[单项选择题]
22、A
2.5Gb/s(OC-48orSTM-16)opticalsignalwithadispersiontoleranceof1200ps/nmgoesthroughfiberwith18ps/nm*kmof
dispersion.Howmany15216-DCU-350equivalentsareneededforenoughcompensationaftertraveling100km?
()
A.none
B.one
C.two
D.three
E.four
参考答案:
C
[多项选择题]
23、Whichthreetechnologiesareusedtoreducechromaticdispersionaccumulationinfiber-optictransmissionsystems?
()
(Choose
three.)
A.PINphotodiodes
B.zero-chirpedlasers
C.Erbium-dopedfiberamplifiers
D.dispersioncompensatingfiber
E.dispersioncompensatingBragggrating
参考答案:
B,D,E
[单项选择题]
24、Whatisthedifferencebetweenthetransmittedpowerandthesensitivityofthereceiver?
()
A.OSNR
B.dispersion
C.attenuation
D.powerbudget
E.amplifierspacing
F.fourwavemixing
参考答案:
D
[单项选择题]
25、Whyarethe1300nmand1550nmregionsofthefiberspectrumprimarilyusedforopticalcommunications?
()
A.Theyarebothregionsoflowest
loss.
B.Theyarebothregionsoflow
reflections.
C.Theyarebothregionsoflowindexof
refraction.
D.Theyarebothregionsoflowchromatic
dispersion.
E.TheyarebothregionsoflowPolarizationModeDispersion(PMD).
参考答案:
A
[单项选择题]
26、Giventhe
formula:
(FiberAttenuation*Km)+(SpliceAttenuation*#ofSplices)+(ConnectorAttenuation*#ofConnectors)+(OpticalFiberorOADM)+Buffer(Fiberaging))WithregardtoSONET/SDHopticalcalculations,whatwillthegivenformulaprovide?
()
A.fiberloss
B.OSNRlevel
C.postamplification
D.indexofreflection
E.indexofrefraction
F.powerpostamplificationbudget
参考答案:
A
[单项选择题]
27、WhichdevicecreatesanOEOconversion?
()
A.amplifier
B.attenuator
C.regenerator
D.lightemitter
E.opticalswitch
F.opticalreceiver
G.fiber-opticcable
参考答案:
C
[单项选择题]
28、Forlaserswithtightlycontrolledwavelengths,approximatelyhowfarapartarethecentersofadjacentwavelengthswhen100GHzspacingisusedinaDWDMsystem?
()
A.0.4nanometers
B.0.6nanometers
C.0.8nanometers
D.1.2nanometers
E.1.6
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