ccna4第四学期final.docx
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ccna4第四学期final.docx
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ccna4第四学期final
CCNA4final答案
1.Anetworkadministratoristaskedwithmaintainingtworemotelocationsinthesamecity.BothlocationssameserviceproviderandhavethesameserviceplanforDSLservice.Whencomparingdownloadrates,noticedthatthelocationontheEastsideoftownhasafasterdownloadratethanthelocationontheWesttown.Howcanthisbeexplained?
TheWestsidehasahighvolumeofPOTStraffic.
TheWestsideoftownisdownloadinglargerpackets.
xxxTheserviceproviderisclosertothelocationontheEastside.
MoreclientsshareaconnectiontotheDSLAMontheWestside.
2.Refertotheexhibit.Thenetworkadministratorcreatesastandardaccesscontrollistto
192.168.1.0/24networkfromreachingthe192.168.2.0/24networkwhilestillpermittingInternetaccessfornetworks.Onwhichrouterinterfaceandinwhichdirectionshoulditbeapplied?
interfaceFa0/0,inbound
interfaceFa0/0,outbound
interfaceFa0/1,inbound
xxxinterfaceFa0/1,outbound
3.WhichFrameRelayflowcontrolmechanismisusedtosignalroutersthattheyshouldreducetheflowrateframes?
DE
BE
CIR
xxxFECN
CBIR
4.Refertotheexhibit.AnetworkadministratorisattemptingtoconfigureaFrameRelaynetwork.TheadministratorentersthecommandsasshownintheexhibitonR2,buttheFrameRelayPVCsareinactive.istheproblem?
xxxTheincorrectDLCInumbersarebeingconfiguredonR2.
TheS0/0/0interfaceonR2needstobepoint-to-point.
Theframe-relaymapcommandsaremissingtheciscokeywordattheend.
AsinglerouterinterfacecannotconnecttomorethanoneFrameRelaypeeratatime.
5.WhataretwomainVPNcomponentsthatprotectdatafromeavesdropping?
(Choosetwo.)
checksum
digitalcertificates
encapsulation
xxxencryption
xxxhashing
6.Refertotheexhibit.Communicationbetweentwopeershasfailed.Basedontheoutputthatisshown,whatthemostlikelycause?
interfacereset
unpluggedcable
improperLMItype
xxxPPPnegotiationfailure
7.Refertotheexhibit.Router1isnotabletocommunicatewithitspeerthatisconnectedtothisinterface.Basedtheoutputasshown,whatisthemostlikelycause?
interfacereset
xxxunpluggedcable
improperLMItype
PPPnegotiationfailure
8.Refertotheexhibit.ResultsoftheshowvlanandshowvtpstatuscommandsforswitchesS1andS2aredisplayedintheexhibit.VLAN11wascreatedonS1.WhyisVLAN11missingfromS2?
ThereisaLayer2loop.
xxxTheVTPdomainnamesdonotmatch.
Onlyoneswitchcanbeinservermode.
S2hasahigherspanning-treepriorityforVLAN11thanS1does.
9.Refertotheexhibit.Atechnicianissuestheshowinterfaces0/0/0commandonR1whiletroubleshootingnetworkproblem.Whattwoconclusionscanbedeterminedbyfromtheoutputshown?
(Choosetwo.)
xxxThebandwidthhasbeensettothevalueofaT1line.
ThisinterfaceshouldbeconfiguredforPPPencapsulation.
xxxThereisnofailureindicatedinanOSILayer1orLayer2.
Thephysicalconnectionbetweenthetworoutershasfailed.
TheIPaddressofS0/0/0isinvalid,giventhesubnetmaskbeingused
10.Whichoptioncorrectlydefinesthecapacitythroughthelocalloopguaranteedtoacustomerbytheservice
provider?
BE
DE
xxxCIR
CBIR
11.Whatarethreeattributesofasecuritypolicy?
(Choosethree.)
xxxItprovidesstep-by-stepprocedurestohardenroutersandothernetworkdevices.
Itdefinesacceptableandunacceptableuseofnetworkresources.
Itfocusesprimarilyonattacksfromoutsideoftheorganization.
xxxItdefinesaprocessformanagingsecurityviolations.
Itshouldnotneedtobealteredonceimplemented.
xxxItcreatesabasisforlegalactionifnecessary.
12.Refertotheexhibit.Whichconfigurationcommandwouldresultintheoutputintheexhibit?
ipnatinsidesourcestatic10.1.200.254172.16.76.3
ipnatinsidesourcestatic10.1.200.254192.168.0.10
ipnatinsidesourcestatic172.16.76.310.1.200.254
ipnatinsidesourcestatic172.16.76.3192.168.0.10
xxxipnatinsidesourcestatic192.168.0.10172.16.76.3
ipnatinsidesourcestatic192.168.0.1010.1.200.254
13.Refertotheexhibit.AnACLcalledManagersalreadyexistsonthisrouter.Whathappensifthenetworkadministratorissuesthecommandsasshownintheexhibit?
xxxThecommandsareaddedtotheendoftheexistingACL.
TheexistingManagersACLwillbeoverwrittenbythenewACL.
Therouterwilloutputanerrormessageandnochangeswillbemade.
AduplicateManagersACLwillbecreatedthatwillcontainonlythenewcommands.
14.Refertotheexhibit.Anetworkadministratorhasissuedthecommandsthatareshown
onRouter1andRouter2.Alaterreviewoftheroutingtablesrevealsthatneitherrouteris
learningtheLANnetworkoftheneighborrouter.Whatismostlikelytheproblemwith
theRIPngconfiguration?
Theserialinterfacesareindifferentsubnets.
xxxTheRIPngprocessisnotenabledoninterfaces.
TheRIPngprocessesdonotmatchbetweenRouter1andRouter2.
TheRIPngnetworkcommandismissingfromtheIPv6RIPconfiguration.
15.WhileconfiguringarouterusingRIPnganddual-stacktechnologywithIPv4andIPv6,theadministrator
receivesanerrormessagewheninputtingIPv4routes.Whatcouldcausetheerrormessage?
xxxIPv4isnotcompatiblewithRIPng
RIPngisincompatiblewithdual-stacktechnology.
Therouterinterfaceshavebeenconfiguredwithincorrectaddresses.
WhenIPv4andIPv6areconfiguredonthesameinterface,allIPv4addressesareshutdowninfavornewertechnology.
16.Refertotheexhibit.AtechnicianisteachingatraineetointerprettheresultsofvariousFrameRelay
troubleshootingcommands.Whatconclusioncanbedrawnfromtheoutputthatisshown?
NeighboringroutersshoulduseDLCI177toreachtheBranchrouter.
DLCI177willbeusedtoidentifyallbroadcaststhataresentouttheBranchrouter.
xxxTheBranchrouterhastheaddress192.168.3.1configuredfortheS0/0/0interface.
Toreach192.168.3.1,theBranchrouterwillusethevirtualcircuitthatisidentified
17.WhichstatementaboutaVPNistrue?
VPNlinkestablishmentandmaintenanceisprovidedbyLCP.
DLCIaddressesareusedtoidentifyeachendoftheVPNtunnel.
xxxVPNsusevirtualLayer3connectionsthatareroutedthroughtheInternet.
OnlyIPpacketscanbeencapsulatedbyaVPNfortunnelingthroughtheInternet.
18.Refertotheexhibit.R1isperformingNAToverloadforthe10.1.1.0/24insidenetwork.HostAhassentapackettoWebServer.WhatisthedestinationIPaddressofthereturnpacketfromWebServerwhenreceivedR1?
10.1.1.2:
80
10.1.1.2:
1234
172.30.20.1:
1234
xxx172.30.20.1:
3333
19.Whatwillbetheresultofaddingthecommandipdhcpexcluded-address10.10.4.110.10.4.5totheconfigurationofalocalrouterthathasbeenconfiguredasaDHCPserver?
Trafficthatisdestinedfor10.10.4.1and10.10.4.5willbedroppedbytherouter.
Trafficwillnotberoutedfromclientswithaddressesbetween10.10.4.1and10.10.4.5.
xxxTheDHCPserverwillnotissuetheaddressesrangingfrom10.10.4.1to10.10.4.5.
TherouterwillignorealltrafficthatcomesfromtheDHCPserverswithaddresses10.10.4.1and10.10.4.5
20.Refertotheexhibit.Whichdatatransmissiontechnologyisbeingrepresented?
xxxTDM
PPP
HDLC
SLIP
21.Whichthreeguidelineswouldhelpcontributetocreatingastrongpasswordpolicy?
(Choosethree.)
Onceagoodpasswordiscreated,donotchangeit.
xxxDeliberatelymisspellwordswhencreatingpasswords.
xxxCreatepasswordsthatareatleast8charactersinlength.
xxxUsecombinationsofuppercase,lowercase,andspecialcharacters.
Writepasswordsinlocationsthatcanbeeasilyretrievedtoavoidbeinglockedout.
Uselongwordsfoundinthedictionarytomakepasswordsthatareeasytoremember.
22.Refertotheexhibit.Basedontheoutputasshown,whichtwostatementscorrectlydefinehowtheroutertreatTelnettrafficthatcomesintointerfaceFastEthernet0/1?
(Choosetwo).
Telnetto172.16.10.0/24isdenied.
xxxTelnetto172.16.20.0/24isdenied.
Telnetto172.16.0.0/24ispermitted.
xxxTelnetto172.16.10.0/24ispermitted.
Telnetto172.16.20.0/24ispermitted.
23.Refertotheexhibit.AnetworkadministratorisconsideringupdatingtheIOSonRouter1.WhatversionofiscurrentlyinstalledonRouter1?
1
xxx12.4
15
1841
24.WhichadditionalfunctionalityisavailableonaninterfacewhentheencapsulationischangedfromHDLCPPP?
flowcontrol
errorcontrol
xxxauthentication
synchronouscommunication
25.WhenFrameRelayencapsulationisused,whatfeatureprovidesflowcontrolandexchangesinformationthestatusofvirtualcircuits?
LCP
xxxLMI
DLCI
InverseARP
26.Whatcourseofactionwillensuredataconfidentiality?
xxxProtectdatafromeavesdropping.
Guaranteethatnoalterationsaremadetothedata.
Ensurethatonlyauthorizedusersmaysavethedata.
Preventunauthorizedusersfromloggingintothedatanetwork.
27.Refertotheexhibit.AnetworkadministratoristaskedwithcompletingtheFrameRelaytopologythatinterconnectstworemotesites.Howshouldthepoint-to-pointsubinterfacesbeconfiguredonHQtocompletethetopology?
frame-relayinterface-dlci103onSerial0/0/0.1frame-relayinterface-dlci203onSerial0/0/0.2
xxxframe-relayinterface-dlci301onSerial0/0/0.1frame-relayinterface-dlci302onSerial0/0/0.2
frame-relaymapip192.168.1.1103broadcastonSerial0/0/0.1frame-relaymapip192.168.2.2203broadcastonSerial0/0/0.2
frame-relaymapip192.168.1.1301broadcastonSerial0/0/0.1frame-relaymapip192.168.2.2302broadcastonSerial0/0/0.2
28.Anetworkadministratorisworkingwithanapplicationsteamtofixaproblemthataserverbasedapplicationhavingwithresponsetime.Theadministratorhasexami
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