CCNA学习必备.docx
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CCNA学习必备.docx
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CCNA学习必备
1.WhatfunctionalitydoaccesscontrollistsprovideintheimplementationofdynamicNATonaCiscorouter?
definewhichaddressescanbetranslated
definewhichaddressesareassignedtoaNATpool
definewhichaddressesareallowedouttherouter
definewhichaddressescanbeaccessedfromtheinsidenetwork
2.Whichthreeguidelineswouldhelpcontributetocreatingastrongpasswordpolicy?
(Choosethree.)
Onceagoodpasswordiscreated,donotchangeit.
Deliberatelymisspellwordswhencreatingpasswords.
Createpasswordsthatareatleast8charactersinlength.
Usecombinationsofuppercase,lowercase,andspecialcharacters.
Writepasswordsinlocationsthatcanbeeasilyretrievedtoavoidbeinglockedout.
Uselongwordsfoundinthedictionarytomakepasswordsthatareeasytoremember.
3.
Refertotheexhibit.Everytimetheadministratorrebootsthisrouter,thebootprocessendsinsetupmode.Whatisapossibleproblem?
ThereisinsufficientRAMfortheIOStoloadonthisrouter.
Apasswordrecoveryprocessshouldbedoneonthisrouter.
ThebootstrapversionandtheversionoftheIOSaredifferent.
TheIOSimageisdamagedandmustbereloadedusingtftpdnld.
Theconfigurationregisterissettoignorethestartupconfiguration.
4.Whichoptioncorrectlydefinesthecapacitythroughthelocalloopguaranteedtoacustomerbytheserviceprovider?
BE
DE
CIR
CBIR
5.
Refertotheexhibit.AhostconnectedtoFa0/0isunabletoacquireanIPaddressfromtheDHCPserver.Theoutputofthedebugipdhcpservercommandshows“DHCPD:
thereisnoaddresspoolfor10.1.1.1″.Whatistheproblem?
The10.1.1.1addressisalreadyconfiguredonFa0/0.
Thedefaultrouterforthe10Networkpoolisincorrect.
Theiphelper-addressmustbeaddedtoFa0/0interface.
Thepoolofaddressesforthe10Networkpoolisincorrect.
6.WhichdatalinklayerencapsulationprotocolisusedbydefaultforserialconnectionsbetweentwoCiscorouters?
ATM
FrameRelay
HDLC
PPP
SDLC
7.
Refertotheexhibit.WhichstatementcorrectlydescribeshowRouter1processesanFTPrequestthatentersinterfaces0/0/0andisdestinedforanFTPserveratIPaddress192.168.1.5?
Theroutermatchestheincomingpackettothestatementthatwascreatedbytheaccess-list201denyicmp192.168.1.00.0.0.255anycommand,continuescomparingthepackettotheremainingstatementsinACL201toensurethatnosubsequentstatementsallowFTP,andthentherouterdropsthepacket.
TherouterreachestheendofACL101withoutmatchingaconditionanddropsthepacketbecausethereisnostatementthatwascreatedbytheaccess-list101permitipanyanycommand.
Theroutermatchestheincomingpackettothestatementthatwascreatedbytheaccess-list101permitipany192.168.1.00.0.0.255commandandallowsthepacketintotherouter.
Itmatchestheincomingpackettothestatementthatwascreatedbytheaccess-list201permitipanyanycommandandallowsthepacketintotherouter.
8.ComparedwithIDSsystems,whatcanIPSsystemsdotoprovidefurtherprotectionofcomputersystems?
detectpotentialattacks
stopthedetectedattackfromexecuting
updateOSpatchesforcomputersystems
scancomputersystemsforvirusesandspyware
9.WhichIEEE802.16broadbandwirelesstechnologyallowsuserstoconnecttotheISPatspeedscomparabletoDSLandcable?
Wi-Fi
satellite
WiMAX
MetroEthernet
10.AnetworkadministratorhaschangedtheVLANconfigurationsonhisnetworkswitchesoverthepastweekend.Howcantheadministratordetermineiftheadditionsandchangesimprovedperformanceandavailabilityonthecompanyintranet?
Conductaperformancetestandcomparewiththebaselinethatwasestablishedpreviously.
Interviewdepartmentalsecretariesanddetermineiftheythinkloadtimeforwebpageshasimproved.
Determineperformanceontheintranetbymonitoringloadtimesofcompanywebpagesfromremotesites.
Comparethehitcountsonthecompanywebserverforthecurrentweektothevaluesthatwererecordedinpreviousweeks.
11.
Refertotheexhibit.Whatisthemeaningofthetermdynamicintheoutputofthecommand?
ThebandwidthcapabilityoftheinterfaceincreasesanddecreasesautomaticallybasedonBECNs.
TheSerial0/0/1interfaceacquired172.16.3.1fromaDHCPserver.
ThemappingbetweenDLCI100and172.16.3.1waslearnedthroughInverseARP.
DLCI100willautomaticallyadapttochangesintheFrameRelaycloud.
12.WhichtypeofACLwillpermittrafficinboundintoaprivatenetworkonlyifanoutboundsessionhasalreadybeenestablishedbetweenthesourceanddestination?
extended
reflexive
standard
time-based
13.WhichtwostatementsaretrueaboutIPv6linklocaladdresses?
(Choosetwo.)
Theybeginwiththe2000:
:
/3prefix.
TheybeginwiththeFE80:
:
/10prefix.
TheyareassignedbyIANAtoanorganization.
Theymustbemanuallyconfiguredbytheadministrator.
Theyareassignedtoahostbyastatelessautoconfigurationprocess.
14.AcompanyislookingforaWANsolutiontoconnectitsheadquarterssitetofourremotesites.WhataretwoadvantagesthatdedicatedleasedlinesprovidecomparedtoasharedFrameRelaysolution?
(Choosetwo.)
reducedjitter
reducedcosts
reducedlatency
theabilitytoburstaboveguaranteedbandwidth
theabilitytoborrowunusedbandwidthfromtheleasedlinesofothercustomers
15.
Refertotheexhibit.AnetworkadministratoristryingtoconnectR1remotelytomakeconfigurationchanges.Basedontheexhibitedcommandoutput,whatwillbetheresultwhenattemptingtoconnecttoR1?
failuretoconnectduetoTelnetnotbeingenabled
failuretoconnectduetoincompleteconfigurationforTelnet
asuccessfulconnectionandabilitytomakeconfigurationchanges
asuccessfulconnectionbutinabilitytomakeconfigurationchangesbecauseoftheabsenceofanenablesecretpassword
16.Whataretwoeffectivemeasuresforsecuringrouters?
(Choosetwo.)
Protectallactiverouterinterfacesbyconfiguringthemaspassiveinterfaces.
ConfigureremoteadministrationthroughVTYlinesforTelnetaccess.
Usequotesorphrasestocreatepassphrases.
DisabletheHTTPserverservice.
EnableSNMPtraps.
17.Anissueofresponsetimehasrecentlyarisenonanapplicationserver.Thenewreleaseofasoftwarepackagehasalsobeeninstalledontheserver.Theconfigurationofthenetworkhaschangedrecently.Toidentifytheproblem,individualsfrombothteamsresponsiblefortherecentchangesbegintoinvestigatethesourceoftheproblem.Whichstatementappliestothissituation?
Schedulingwillbeeasyifthenetworkandsoftwareteamsworkindependently.
Itwillbedifficulttoisolatetheproblemiftwoteamsareimplementingchangesindependently.
Resultsfromchangeswillbeeasiertoreconcileanddocumentifeachteamworksinisolation.
Onlyresultsfromthesoftwarepackageshouldbetestedasthenetworkisdesignedtoaccommodatetheproposedsoftwareplatform.
18.
Refertotheexhibit.Fromtheoutputoftheshowinterfacesandpingcommands,atwhichlayeroftheOSImodelisafaultindicated?
application
transport
network
datalink
physical
19.Whichtechnologyisusedtodynamicallymapnexthop,networklayeraddressestovirtualcircuitsinaFrameRelaynetwork?
InverseARP
LMI
DLCI
FECN
20.Anadministratorlearnsofane-mailthathasbeenreceivedbyanumberofusersinthecompany.Thise-mailappearstocomefromtheofficeoftheadministrator.Thee-mailaskstheuserstoconfirmtheiraccountandpasswordinformation.Whichtypeofsecuritythreatdoesthise-mailrepresent?
cracking
phishing
phreaking
spamming
21.
Refertotheexhibit.Whichdatatransmissiontechnologyisbeingrepresented?
TDM
PPP
HDLC
SLIP
22.
Refertotheexhibit.ResultsoftheshowvlanandshowvtpstatuscommandsforswitchesS1andS2aredisplayedintheexhibit.VLAN11wascreatedonS1.WhyisVLAN11missingfromS2?
ThereisaLayer2loop.
TheVTPdomainnamesdonotmatch.
Onlyoneswitchcanbeinservermode.
S2hasahigherspanning-treepriorityforVLAN11thanS1does.
23.Whatistheresultofaddingtheglobalcommandservicepassword-encryptiontotheconfigurationofarouter?
Linepasswordsareencryptedwithtype7encryption.
Enablepasswordsareencryptedwithtype5encryption.
Allservicesmustprovideanencryptedpasswordtofunction.
Onlyencryptedmessagesareallowedforroutercommunication.
24.Whiletroubleshootingaproblemwithane-mailserver,anadministratorobservesthattheswitchportusedbytheservershows“up,lineprotocolup”.Theadministratorcannotpingtheserver.AtwhichlayeroftheOSImodelistheproblemmostlikelytobefound?
applicationlayer
networklayer
datalinklayer
physicallayer
25.WheredoesaserviceproviderassumeresponsibilityfromacustomerforaWANconnection?
localloop
DTEcableonrouter
demarcationpoint
demilitarizedzone
26.Whatwillbetheresultofaddingthecommandipdhcpexcluded-address192.168.24.1192.168.24.5totheconfigurationofalocalrouterthathasbeenconfiguredasaDHCPserver?
Trafficthatisdestinedfor192.168.24.1and192.168.24.5willbedroppedbytherouter.
Trafficwillnotberoutedfromclientswithaddressesbetween192.168.24.1and192.168.24.5.
TheDHCPserverwillnotissuetheaddressesrangingfrom192.168.24.1to192.168.24.5.
TherouterwillignorealltrafficthatcomesfromtheDHCPserverswithaddresses192.168.24.1and192.168.24.5.
27.
Refertotheexhibit.Partialresultsoftheshowaccess-listsandshowipinterfaceFastEthernet0/1commandsforrouterRouter1areshown.TherearenootherACLsineffect.HostAisunabletotelnettohostB.Whichactionwillcorrecttheproblembutstillre
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