ccna 3 final answer.docx
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ccna 3 final answer.docx
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ccna3finalanswer
1.Whichparameterisusedtouniquelyidentifyonewirelessnetworkfromanother?
SSID
OFDM
WEP
DSSS
2.Refertotheexhibit.HowdoesSW1managetrafficcomingfromHostA?
SW1dropsthetrafficbecauseitisuntagged.
SW1leavesthetrafficuntaggedandforwardsitoverthetrunk.
SW1tagsthetrafficwiththelowestVLANIDvalueandforwardsitoverthetrunklink.
SW1encapsulatesthetrafficwith802.1Qencapsulationandforwardsitoverthetrunklink.
3.WhatisapossibleimpactofsettingtooshortanagingtimeintheMACaddresstableofaswitch?
overlylargeaddresstable
unnecessaryfloodingofpackets
excessivetimeoutsofstaticaddresses
impairedabilitytodynamicallylearnnewaddresses
4.Refertotheexhibit.ThenetworkadministratorhasjustaddedVLAN50toSwitch1andSwitch2.HostsA,B,C,andDarecorrectlyconfiguredwithIPaddressesinthesubnetrangeforVLAN50.HostAcancommunicatewithhostB,butcannotcommunicatewithhostCorhostD.Whatisthecauseofthisproblem?
ThereisanativeVLANmismatch.
TheFa0/11interfaceofSwitch1isnotconfiguredasatrunk.
ThelinkbetweenSwitch1andSwitch2isupbutnottrunked.
VLAN50isnotallowedonthetrunklinkbetweenSwitch1andSwitch2.
5.Usingthecommandcopytftp:
backup.cfgstartup-config,anadministratordownloadedasavedconfigurationfromaTFTPservertoaswitch.Whydoestheadministratornotdetectanychangesintheswitchconfigurationafterthedownloadcompletes?
Thecommandshouldhavebeencopystartup-configtftp:
backup.cfg.
AbackupconfigurationfromaTFTPservercannotbecopieddirectlyintothestartup-config.
Thecommandcopyrunning-configstartup-configshouldbeusedtosavethechangesontheswitch.
Downloadingtothestartup-configrequirestheswitchtobereloadedinorderfortheconfigurationtotakeeffect.
6.Refertotheexhibit.TheteacherhostisconnectedtoportFa0/7onswitchSTW.AstudenthasdecidedtoshareaccesstotheInternetbyattachingahubandlaptoptoSTWasshown.Whatwillbetheresultofthestudentmakingthisconnection?
TheFa0/7portofSTWwillbeshutdown.
ThestudentwillgainfullaccesstotheInternet.
Boththeteacherandstudentwillbeabletoreceivedatabutonlytheteacherwillbeabletosend.
Theframesfromthelaptopwillbedropped,buttheteacherhostwillmaintainconnectivitywiththenetwork.
7.Whichvaluedeterminesifaswitchbecomesthecentralpointofreferenceinthespanningtreetopology?
lowestbridgeID
highestrevisionnumber
lowestnumericIPaddress
highestnumericMACaddress
8.Refertotheexhibit.HowisportGi1/1onSWT-Afunctioninginthespanning-treetopology?
Itissendingandreceivingdataframes.
ItisreceivingBPDUs,butnotsendingdataframes.
ItisparticipatingintheelectionprocessbyforwardingtheBPDUsitreceives.
ItisreceivingBPDUsandpopulatingtheMACaddresstable,butnotsendingdata.
9.Inathree-layerhierarchicalnetworkdesign,whichdistributionlayerfunctiondelineatesbroadcastdomains?
routingbetweenVLANs
aggregatingtrafficflows
providingredundantlinks
reducingthenetworkdiameter
10.Refertotheexhibit.Thedevicesinthenetworkareoperationalandconfiguredasindicatedintheexhibit.However,hostsBandDcannotpingeachother.Whatisthemostlikelycauseofthisproblem?
Thelinkbetweentheswitchesisupbutnottrunked.
TheFa0/11interfaceofSwitch1isnotconfiguredasatrunk.
HostsBandDareconfiguredwithIPaddressesfromdifferentsubnets.
VLAN20andVLAN30arenotallowedonthetrunkbetweentheswitches.
11.Refertotheexhibit.IfswitchSW1isconfiguredwiththefourVLANsasshownintheexhibit,howmanyphysicalinterfacesareneededonrouterR1toconfigureinter-VLANroutingusingsubinterfaces?
zero
one
two
four
12.WhattwomethodscanbeusedtoremoveMACaddresstableentriesfromaswitch?
(Choosetwo.)
Powercycletheswitchtoclearalldynamicallylearnedaddresses.
Theclearswitching-tablescommandwillremovestaticallyconfiguredentries.
Theclearmac-address-tablecommandwillremovestaticallyanddynamicallyconfiguredtableentries.
Theeraseflashcommandwillclearallstaticallyconfiguredtableentries.
StaticallyconfiguredMACaddresseswillautomaticallyberemovedfromtheaddresstable300minutesafterthelastactivityonaswitchport.
13.Refertotheexhibit.Alledgeportsareconfiguredwiththespanning-treeportfastcommand.Host1isrecentlyconnectedtoportFa0/1onswitchSW1.WhichstatementistrueaboutthestatusofportFa0/1?
Theportwilltransitionintoblockingstate.
Theportwilltransitionimmediatelyintoforwardingstate.
Theportwilltransitionintoblockingstateandthenimmediatelyintoforwardingstate.
Theportwilltransitionintoblockingstateandimmediatelytransitionthroughthelisteningandlearningstates.
14.Refertotheexhibit.TheconfigurationstepsthatarelistedintheexhibithavebeenenteredinswitchS1viatheconsole.Subsequentattemptstotelnettotheswitcharenotsuccessful.Whatiscausingtheproblem?
TheswitchmustbeconfiguredwithSSHversion1.
ThetransportinputcommandmustspecifyTelnetaccess.
TheRSAkeysmustbereturnedtozerobeforeSSHwillpermitTelnetaccess.
Theipdomain-namecommandmustalsobeenteredinlineconfigurationmodeforthevtylines.
15.Anetworkadministratorconfiguresaswitchportwiththecommandswitchportmodedynamicauto.Whatistheresultingbehavioroftheswitchport?
Theswitchportisabletotrunkiftheremoteswitchportissettoauto.
Theswitchportisabletotrunkiftheremoteswitchportissettodesirable.
Theswitchportwillbedisabledifitisunabletosuccessfullynegotiatetrunking.
Asuccessfultrunkwillbeestablishediftheremoteswitchisnon-Ciscobuttheportisconfiguredfortrunking.
16.WhichsecurityprotocolormeasurewouldprovidethegreatestprotectionforawirelessLAN?
WPA2
cloakingSSIDs
sharedWEPkey
MACaddressfiltering
17.Refertotheexhibit.AnewhostneedstobeconnectedtoVLAN1.WhichIPaddressshouldbeassignedtothisnewhost?
192.168.1.11/28
192.168.1.22/28
192.168.1.33/28
192.168.1.44/28
192.168.1.55/28
18.Whatisonedisadvantagethat802.11awirelesshascomparedto802.11g?
Useofthe5GHzbandrequiresmuchlargerantennas.
TheOFDMmodulationtechniqueresultsinaslowerdatarate.
Therearefewernon-overlappingchannelsavailabletohelpreduceRFinterference.
Theuseofhigherfrequenciesmeansthatsignalsaremorelikelytobeobstructed.
19.Refertotheexhibit.UsersAandBarereportingintermittentconnectivityproblems.Pre-installationsurveysshowedstrongsignalstrengthfromtheAPlocationstotheclientlocations.Outsideelectricalinterferencehasbeeneliminated.Whatwillfixtheproblem?
RelocatetheAPsclosertoeachother.
Increasethedistancebetweentheclients.
ChangethechannelonAP-Bto6or11.
PlaceAP-AandAP-Bonthesamewirelesschannel.
20.Refertotheexhibit.AlltrunklinksareoperationalandallVLANsareallowedonalltrunklinks.AnARPrequestissentbycomputer5.Whichdeviceordeviceswillreceivethismessage?
onlycomputer4
computer3andRTR-A
computer4andRTR-A
computer1,computer2,computer4,andRTR-A
computer1,computer2,computer3,computer4,andRTR-A
allofthecomputersandtherouter
21.Refertotheexhibit.RouterRAreceivesapacketwithasourceaddressof192.168.1.65andadestinationaddressof192.168.1.161.Whatwilltherouterdowiththispacket?
Therouterwilldropthepacket.
TherouterwillforwardthepacketoutinterfaceFastEthernet0/1.1.
TherouterwillforwardthepacketoutinterfaceFastEthernet0/1.2.
TherouterwillforwardthepacketoutinterfaceFastEthernet0/1.3.
TherouterwillforwardthepacketoutinterfaceFastEthernet0/1.2andinterfaceFastEthernet0/1.3.
22.AnadministratoristroubleshootingaPConthenetworkwhichissufferingfromslowandintermittentconnectivity.ThePChasapingsuccessratetothedefaultgatewayoflessthanhalfthepingattempts.OtherPCsontheswitchcanconsistentlypingthedefaultgateway.TheswitchportisconfiguredforautoduplexandthePCisconfiguredforfullduplex.Whatwillcommonlycausethisproblem?
ThePCissettofullduplex.Theswitchportfailstoautonegotiatetheduplexsettinganddefaultstohalfduplex,whichcausesaduplexmismatch.
Theswitchtrafficisexceedingavailableframebuffers.Theresultisthatframesarebeingdropped.
ThePCandthedefaultgatewayhavedifferentbandwidthEthernetports.
ThedefaultgatewayisnotonthesameswitchthatthePCis.
23.WhyisitadvisablethatanetworkadministratoruseSSHinsteadofTelnetwhenmanagingswitches?
SSHusesTCPwhereasTelnetdoesnot.
SSHencryptsonlytheusernameandpasswordwhenloggingin.
SSHencryptsallremotemanagementcommunicationswhereasTelnetdoesnot.
SSHsendsacleartextmessagesteamwhichreducesthebandwidthuseformanagement.
24.Refertotheexhibit.WhatwouldhappenifthenetworkadministratormovedthenetworkcableofHostAfrominterfaceFa0/1toFa0/3onswitchSW1?
HostAremainsamemberofVLAN10,becausetherouterisroutingtrafficbetweenVLANs.
HostAisnolongeramemberofVLAN10,becauseportFa0/3hasbeenmanuallyassignedtoVLAN30.
HostAremainsamemberofVLAN10,becausetheswitchprovidesdynamicVLANassignmentfortheport.
HostAmaintainsconnectivitytoallmembersofVLAN10,becauseitisconnectedtothesamephysicalnetwork.
HostAisnolongeramemberofVLAN10,butbecauseportFa0/3wasunused,itisnowamemberofVLAN1.
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