51CTO下载Cisco+Certified+Network+Associate.docx
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51CTO下载Cisco+Certified+Network+Associate.docx
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51CTO下载Cisco+Certified+Network+Associate
CiscoCertifiedNetworkAssociate
由于权限问题,上传不了大附件,需要完整的请去
Number:
640-802
PassingScore:
800
TimeLimit:
120min
QUESTION1
BothswitchesandhubsarebeingutilizedwithintheTestKingnetwork.Whichofthefollowingistrueregardingtheuseofswitchesandhubsfornetworkconnectivityinthisnetwork?
A.
Switchestakelesstimetoprocessframesthanhubstake
B.
Hubscanfilterframes
C.
Switchesdonotforwardbroadcasts
D.
Switchesincreasethenumberofcollisiondomainsinthenetwork
E.
Usinghubscanincreasetheamountofbandwidthavailabletohosts
F.
Noneoftheotheralternativesapply
Answer:
D
Section:
(none)
Explanation/Reference:
Explanation:
Thebiggestbenefitofusingswitchesinsteadofhubsinyourinternetworkisthateachswitchportisactuallyitsowncollisiondomain.(Conversely,ahubcreatesonelargecollisiondomain.)Butevenarmedwithaswitch,youstillcan'tbreakupbroadcastdomains.Neitherswitchesnorbridgeswilldothat.They'lltypicallysimplyforwardallbroadcastsinstead.Switchcreatesthecollisiondomainperport,sowecansayswitchincreasethenumberofcollisiondomains.
QUESTION2
Whichoneofthefollowingcharacteristicsistrueregardingtheuseofhubsandswitches?
A.
HubscanhavetheirportsbeconfiguredwithVLANs
B.
Usinghubsiscostlywithregardtobandwidthavailability.
C.
Switchescannotforwardbroadcasts.
LeadingthewayinITtestingandcertificationtools,
D.
Switchesaremoreefficientthanhubsinprocessingframes.
E.
Switchesincreasethenumberofcollisiondomainsinthenetwork.
Answer:
E
Section:
(none)
Explanation/Reference:
Explanation:
Switchesincreasesthenumberofcollisionsdomainsinthenetwork.SwitchesthatareconfiguredwithVLANswillreducethesizeofthecollisiondomainsbyincreasingthenumberofcollisiondomainsinanetwork,butmakingthemsmallerthanthatofonebig,flatnetwork.
IncorrectAnswers:
A.SwitchesarecapableofVLANconfigurations,buthubsarenot.B.Hubsaregenerallytheleastcostlymethodpossibletoconnectmultipledevicestogetherinanetwork.
C.Switchesforwardbroadcastsandmulticasts,bydefault,toallportswithinthesameVLAN.Onlyroutersblockallbroadcasttrafficbydefault.D.Switchesandhubscanbeequallyefficientinprocessingframes,intheory.Inpractice,switchesaregenerallymoreefficientastheyusuallyhavemoreCPUandmemoryallocatedtothem,andaregenerallymuchmoreexpensivethanasimplehub.
QUESTION3
Whencomparingandcontrastingthesimilaritiesanddifferencesbetweenbridgesandswitches,whichofthefollowingarevalidstatements?
Chooseallthevalidanswerchoices)
A.
Bridgesarefasterthanswitchesbecausetheyhavefewerports.
B.
Aswitchisamultiportbridge,
C.
BridgesandswitcheslearnMACaddressesbyexaminingthesourceMACaddressofeachframereceived.
D.
Abridgewillforwardabroadcastbutaswitchwillnot.
E.
Bridgesandswitchesincreasethesizeofacollisiondomain.
F.
Noneoftheotheralternativesapplystatementsaretrue.
Answer:
BC
Section:
(none)
Explanation/Reference:
Explanation:
BothbridgesandswitchesbuildthebridgetablebylisteningtoincomingframesandexaminingthesourceMACaddressintheframe.
Switchesaremultiportbridgesthatallowyoutocreatemultiplebroadcastdomains.Eachbroadcastdomainislikeadistinctvirtualbridgewithinaswitch.
IncorrectAnswers:
LeadingthewayinITtestingandcertificationtools,A.Switchesaregenerallyfasterthanbridges.Bridgesalsodonotnecessarilyhavefewerportsthanswitches.
D.Bothbridgesandswitcheswillforwardbroadcastandmulticasttraffic,assumingthatthetrafficremainsinthesameVLAN.
E.TheuseofVLANsinaswitchcandecreasethesizeofthecollisiondomain,bycreatingadditional,smallercollisiondomains.
QUESTION4
Whichofthefollowingcorrectlydescribethevariousfunctionsandvirtuesofarouter?
(Selectallvalidanswerchoices)
A.
Packetswitching
B.
CollisionpreventiononaLANsegment.
C.
Packetfiltering
D.
Broadcastdomainenlargement
E.
Broadcastforwarding
F.
Internetworkcommunication
G.
Noneoftheotheralternativesapply
Answer:
ACF
Section:
(none)
Explanation/Reference:
Explanation:
Themainfunctionofarouteristoconnectdifferent,separatednetworkstogether.Indoingso,switchingpacketsfromonenetworktoanotherisaprimaryfunction,alongwithprovidingforcommunicationbetweennetworks.Asanadditionalfeature,routersarecapableofprovidingfilteringonanetworkaddressandapplicationportlevel,sochoiceCisalsocorrect.
IncorrectAnswers:
B.Routerscanindeedbeusedtosegmentanetworkseparateacollisiondomain,sinceroutersdonotforwardLANbroadcastsandmulticaststootherinterfaces.However,routersalonecannotpreventallcollisionsfromoccurringonanygivenLANsegment.D.RoutersactuallysegmentLANsintosmallerbroadcastdomains.E.Routersdonotforwardbroadcastandmulticasttrafficouttheadditionalinterfacesbydefault.UnlessbridgingorIPhelpersareconfiguredontherouter,LANbroadcastsareblockedattherouterlevel.
QUESTION5
LeadingthewayinITtestingandcertificationtools,TheLANneedsareexpandingattheTestkingcorporateoffice,whichisquicklygrowing.YouareinstructedtoenlargetheareacoveredbyasingleLANsegmentontheTestKingnetwork.
Whichofthefollowingarelayer1devicesthatyoucanuse?
(Chooseallthatapply.)
A.
Aswitch
B.
Arouter
C.
Anetworkadaptercard
D.
Ahub
E.
Arepeater
Answer:
DE
Section:
(none)
Explanation/Reference:
Explanation:
Ahubsimplyrepeatstheelectricalsignalandmakesnoattempttointerprettheelectricalsignal(layer1)asaLANframe(Layer2).So,ahubactuallyperformsOSIlayer1functions,repeatinganelectricalsignal,whereasaswitchperformsOSIlayer2functions,actuallyinterpretingEthernetheaderinformation,particularlyaddresses,tomakeforwardingdecisions.HubscanbeusedtoincreasethenumberofstationsthatcanbesupportedonaLAN.
Becausetherepeaterdoesnotinterpretwhatthebitsmean,butdoesexamineandgenerateelectricalsignals,arepeaterisconsideredtooperateatLayer1.RepeaterscanbeusedtophysicallyextendtheLANtogreaterdistances.
QUESTION6
Ciscoistheleaderintheroutermarketspace.Whatbasicfunctionsdotheirroutersperforminanetwork?
(Choosetwo)
A.
Themicro-segmentationofbroadcastdomains
B.
Pathselection
C.
Packetswitching
D.
BridgingbetweenLANsegments
E.
Accesslayersecurity
F.
VLANmembershipassignment
G.
Applicationoptimization
Answer:
BC
Section:
(none)
Explanation/Reference:
Explanation:
LeadingthewayinITtestingandcertificationtools,Theprimaryfunctionsofarouterare:
PacketSwitchingandPathSelection.Itistheroutersjobtodeterminethebestmethodfordeliveringthedata,andswitchingthatdataasquicklyaspossible.
QUESTION7
BothbridgesareswitchesarebeingusedthroughouttheTestKingLAN.Whichofthefollowingstatementsaretrueregardingbridgesandswitchesinthisnetwork?
(Choose3)
A.
Switchesareprimarilysoftwarebasedwhilebridgesarehardwarebased.
B.
Switchesusuallyhaveahighernumberofportsthanmostbridges.
C.
Bridgesarefrequentlyfasterthanswitches.
D.
Bridgesdefinebroadcastdomainswhileswitchesdefinecollisiondomains.
E.
BothbridgesandswitchesforwardLayer2broadcasts.
F.
BothbridgesandswitchesmakeforwardingdecisionsbasedonLayer2addresses.
Answer:
BEF
Section:
(none)
Explanation/Reference:
Explanation:
BothbridgesandswitchesoperateatthesecondlayeroftheOSImodel,processingandforwardingframesfromthedata-linklayer.
Bridgesaresoftwarebasedandswitchesarehardwarebased.
Switcheshavemoreportsthanbridges.
BothbridgesandswitchesforwardframesbasedonMACaddresses.
QUESTION8
Asanetworkadministrator,youwillneedtodecideontheappropriatenetworkdevicestouse.WhichofthefollowingcorrectlydescribestherolesofdevicesinaWAN?
(Choosethree)
A.
ACSU/DSUterminatesadigitallocalloop.
B.
ArouteriscommonlyconsideredaDCEdevice.
C.
Amodemterminatesananaloglocalloop.
D.
ArouteriscommonlyconsideredaDTEdevice.
E.
Amodemterminatesadigitallocalloop.
F.
ACSU/DSUterminatesananaloglocalloop.
G.
AmodemisusedtoterminateaT1
LeadingthewayinITtestingandcertificationtools,
Answer:
ACD
Section:
(none)
Explanation/Reference:
Explanation:
Layer2switchingisconsideredhardware-basedbridgingbecauseitusesspecializedhardwarecalledanapplication-specificintegratedcircuit(ASIC).ASICscanrunuptogigabitspeedswithverylowlatencyrates.
ArouteriscommonlyconsideredtobeaDTEdevice,whileaCSU/DSUisconsideredtheDCEdevice.
Switchesusuallyhavehigherportnumberthenbridge.Generallybridgeshavetwoports.
BothoperateonDatalinklayer.
QUESTION9
TheTestKingnetworkadministratorneedstodeterminewhatLANdevicestoinstallontheTestKingnetwork.WhataretwoadvantagesofusingLayer2Ethernetswitchesoverhubs?
(Choosetwo)
A.
Allowingsimultaneousframetransmissions
B.
Increasingthesizeofbroadcastdomains
C.
IncreasingthemaximumlengthofUTPcablingbetweendevices
D.
FilteringframesbasedonMACaddresses
E.
Decreasingthenumberofcollisiondomains
Answer:
AD
Section:
(none)
Explanation/Reference:
Explanation:
A:
Ahalfduplexconnectionisw
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