ccna题库910.docx
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ccna题库910.docx
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ccna题库910
1.Cisco-Chapter9
1Convertthebinarynumber10111010intoitshexadecimalequivalent.Selectthecorrectanswerfromthelistbelow.
85
90
BA
A1
B3
1C
2WhenacollisionoccursinanetworkusingCSMA/CD,howdohostswithdatatotransmitrespondafterthebackoffperiodhasexpired?
Thehostsreturntoalisten-before-transmitmode.
Thehostscreatingthecollisionhaveprioritytosenddata.
Thehostscreatingthecollisionretransmitthelast16frames.
Thehostsextendtheirdelayperiodtoallowforrapidtransmission.
3Whichofthefollowingdescribeinterframespacing?
(Choosetwo.)
theminimuminterval,measuredinbit-times,thatanystationmustwaitbeforesendinganotherframe
themaximuminterval,measuredinbit-times,thatanystationmustwaitbeforesendinganotherframe
the96-bitpayloadpaddinginsertedintoaframetoachievealegalframesize
the96-bitframepaddingtransmittedbetweenframestoachievepropersynchronization
thetimeallowedforslowstationstoprocessaframeandprepareforthenextframe
themaximumintervalwithinwhichastationmustsendanotherframetoavoidbeingconsideredunreachable
4EthernetoperatesatwhichlayersoftheOSImodel?
(Choosetwo.)
Networklayer
Transportlayer
Physicallayer
Applicationlayer
Sessionlayer
Data-linklayer
5
Inthegraphic,HostAhasreached50%completioninsendinga1KBEthernetframetoHostDwhenHostBwishestotransmititsownframetoHostC.WhatmustHostBdo?
HostBcantransmitimmediatelysinceitisconnectedonitsowncablesegment.
HostBmustwaittoreceiveaCSMAtransmissionfromthehub,tosignalitsturn.
HostBmustsendarequestsignaltoHostAbytransmittinganinterframegap.
HostBmustwaituntilitiscertainthatHostAhascompletedsendingitsframe.
6WhatdoestheIEEE802.2standardrepresentinEthernettechnologies?
MACsublayer
Physicallayer
LogicalLinkControlsublayer
Networklayer
7
Refertotheexhibit.Host_AisattemptingtocontactServer_B.WhichstatementscorrectlydescribetheaddressingHost_Awillgenerateintheprocess?
(Choosetwo.)
ApacketwiththedestinationIPofRouter_B.
AframewiththedestinationMACaddressofSwitch_A.
ApacketwiththedestinationIPofRouter_A.
AframewiththedestinationMACaddressofRouter_A.
ApacketwiththedestinationIPofServer_B.
AframewiththedestinationMACaddressofServer_B.
8WhichofthefollowingisadrawbackoftheCSMA/CDaccessmethod?
Collisionscandecreasenetworkperformance.
Itismorecomplexthannon-deterministicprotocols.
Deterministicmediaaccessprotocolsslownetworkperformance.
CSMA/CDLANtechnologiesareonlyavailableatslowerspeedsthanotherLANtechnologies.
9AfteranEthernetcollision,whenthebackoffalgorithmisinvoked,whichdevicehasprioritytotransmitdata?
thedeviceinvolvedinthecollisionwiththelowestMACaddress
thedeviceinvolvedinthecollisionwiththelowestIPaddress
anydeviceinthecollisiondomainwhosebackofftimerexpiresfirst
thosethatbegantransmittingatthesametime
10
Refertotheexhibit.Theswitchandworkstationareadministrativelyconfiguredforfull-duplexoperation.Whichstatementaccuratelyreflectstheoperationofthislink?
Nocollisionswilloccuronthislink.
Onlyoneofthedevicescantransmitatatime.
Theswitchwillhavepriorityfortransmittingdata.
Thedeviceswilldefaultbacktohalfduplexifexcessivecollisionsoccur.
11WhichtwofeaturesmakeswitchespreferabletohubsinEthernet-basednetworks?
(Choosetwo.)
reductionincross-talk
minimizingofcollisions
supportforUTPcabling
divisionintobroadcastdomains
increaseinthethroughputofcommunications
12WhydohostsonanEthernetsegmentthatexperienceacollisionusearandomdelaybeforeattemptingtotransmitaframe?
Arandomdelayisusedtoensureacollision-freelink.
Arandomdelayvalueforeachdeviceisassignedbythemanufacturer.
Astandarddelayvaluecouldnotbeagreeduponamongnetworkingdevicevendors.
Arandomdelayhelpspreventthestationsfromexperiencinganothercollisionduringthetransmission.
13Whatthreeprimaryfunctionsdoesdatalinklayerencapsulationprovide?
(Choosethree.)
addressing
errordetection
framedelimiting
portidentification
pathdetermination
IPaddressresolution
14WhichstatementscorrectlydescribeMACaddresses?
(Choosethree.)
dynamicallyassigned
copiedintoRAMduringsystemstartup
layer3address
containsa3byteOUI
6byteslong
32bitslong
15WhatarethreefunctionsoftheupperdatalinksublayerintheOSImodel?
(Choosethree.)
recognizesstreamsofbits
identifiesthenetworklayerprotocol
makestheconnectionwiththeupperlayers
identifiesthesourceanddestinationapplications
insulatesnetworklayerprotocolsfromchangesinphysicalequipment
determinesthesourceofatransmissionwhenmultipledevicesaretransmitting
16EthernetoperatesatwhichlayeroftheTCP/IPnetworkmodel?
application
physical
transport
internet
datalink
networkaccess
17HostAhasanIPaddressof172.16.225.93,amaskof255.255.248.0,andadefaultgatewayof172.16.224.1.HostAneedstosendapackettoanewhostwhoseIPis172.16.231.78.HostAperformstheANDingoperationonitsaddressandsubnetmask.Whattwothingswilloccur?
(Choosetwo.)
HostAwillgetaresultof172.16.224.0fromtheANDprocess.
HostAwillsendontothemediaabroadcastframethatcontainsthepacket.
HostAwillbroadcastanARPrequestfortheMACofthehost172.16.231.78.
HostAwillchangethedestinationIPofthepacketto172.16.224.1andforwardthepacket.
HostAwillencapsulatethepacketinaframewithadestinationMACthatistheMACaddressassociatedwith172.16.224.1.
18WhatistheprimarypurposeofARP?
translateURLstoIPaddresses
resolveIPv4addressestoMACaddresses
providedynamicIPconfigurationtonetworkdevices
convertinternalprivateaddressestoexternalpublicaddresses
19
Refertotheexhibit.Whichoptioncorrectlyidentifiescontentthattheframedatafieldmaycontain?
preambleandstopframe
networklayerpacket
physicaladdressing
FCSandSoF
20WhatarethetwomostcommonlyusedmediatypesinEthernetnetworkstoday?
(Choosetwo.)
coaxialthicknet
copperUTP
coaxialthinnet
opticalfiber
shieldedtwistedpair
2.Cisco-Chapter10
1WhataretwocommonmethodsforsettingaUTPEthernetporttoMDIorMDIXoperation?
(Choosetwo.)
cablecolorcodeassociation
cableselectionandconfiguration
useofcabletesterstodeterminepinouts
theautomaticdetectionandnegotiatingofMDI/MDIXoperationoftheport
theenablingofthemechanismtoelectricallyswapthetransmitandreceivepairs
2
Refertotheexhibit.Whichthreestatementsaretrueabouttheexhibitedtopology?
(Choosethree.)
HostsBandCareinthesamesubnet.
Fivebroadcastdomainsarepresent.
HostBisusingacrossovercabletoconnecttotherouter.
Fourbroadcastdomainsarepresent.
Fivenetworksareshown.
HostBisusingarollovercabletoconnecttotherouter.
3
Refertotheexhibit.Assumethatalldevicesareusingdefaultsettings.Howmanysubnetsarerequiredtoaddressthetopologythatisshown?
13457
4Whattypeofnetworkcableisusedbetweenaterminalandaconsoleport?
cross-over
straight-through
rollover
patchcable
5WhichoptionidentifiestheprimaryinterfacewhichwouldbeusedforinitialconfigurationofaCiscorouter?
AUXinterface
Ethernetinterface
serialinterface
consoleinterface
6
Refertotheexhibit.AnetworkadministratorhasdecidedtousepacketcapturesoftwaretoevaluatealltrafficfromthestudentsubnetonthewaytotheInternet.Toensurethatallpacketsarecaptured,whatnetworkdeviceshouldbeusedtoconnectthemonitoringstationtothenetworkbetweenR1andR2?
hub
router
firewallappliance
wirelessaccesspoint
7ToestablishaconsoleconnectionfromacomputertoaCiscorouter,whichcablewiringoptionwouldbeused?
crossovercable
straightthroughcable
rollovercable
V.35cable
8
Refertotheexhibit.Anetworktechnicianhasbeenallocatedthe192.168.1.0/24privateIPaddressrangeforuseinthenetworkthatshownintheexhibit.WhichsubnetmaskwouldbeusedtomeetthehostrequirementsforsegmentAofthisinternetwork?
255.255.255.128
255.255.255.192
255.255.255.224
255.255.255.240
255.255.255.248
9
Refertotheexhibit.Astudentissettingupahomenetworkprimarilyusedforextensivefiletransfers,streamingvideo,andgaming.Whichnetworkdeviceisbestsuitedtothesetypesofactivitiesinthetopologyshown?
wirelessaccesspoint
router
hub
switch
10
Refertotheexhibit.Whichthreestatementsidentifythetypeofcablingthatwouldbeusedinthesegmentsthatareshown?
(Choosethree.)
Segment1usesbackbonecabling.
Segment1usesapatchcable.
Segment3usespatchcabling.
Segment3usesverticalcabling.
Segment3useshorizontalcabling.
Segment4usesverticalcabling.
11Acompanyisplanningtosubnetitsnetworkforamaximumof27hosts.Whichsubnetmaskwouldprovidetheneededhostsandleavethefewestunusedaddressesineachsubnet?
255.255.255.0
255.255.255.192
255.255.255.224
255.255.255.240
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