思科模拟题.docx

思科模拟题.docx

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思科模拟题

2021年思科模拟题：

CCNA、CCNP、CCIE模拟试题

ccna

1.whichofthefollowingtypesofpacketswillbeallowedentrywhenaserialinterface'sinboundaccesslisthasbeenconfiguredtoprohibitentryfortcpandudpports21,23and25?

（selectthreeoptions.）

a.smtp

b.stp

c.ftp

d.telnet

e.http

f.pop3

2.oneofthetraineesassignedtoyouwanttoknowwhichservicesusetcp.whatcanyoutellhim?

（selectthreeoptions.）

a.dhcp

b.smtp

c.snmp

d.ftp

e.http

f.tftp

3.whichofthefollowingnetworkmaskswouldyouusetoreduceanywastageofipaddressesinpoint-to-pointwanlinksonanetworkthatsupportsvlsm?

a./38

b./30

c./27

d./23

e./18

4.howwouldyouconfigurearoutertoavoidsituationssuchassplithorizonissueshamperingroutingupdatesonaframerelaynetwork?

a.configureaseparatesub-interfaceforeachpvcwithauniquedlciandsubnetassignedtothesubinterface.

b.configureeachframerelaycircuitasapoint-to-pointlinetosupportmulticastandbroadcasttraffic.

c.configureonesub-interfacetodisperseintomultiplepvcconnectionstomultipleremoterouterinterfaces.

d.configureasmanyaspossiblesub-interfacesonthesamesubnet.

5.withregardtoisdn,whichofthefollowingaretrue?

（chooseallthatapply.）

a.legacyddrcanuseportinformationtodefineinterestingtraffic.

b.legacyddrcanconfiguremultipledialerconfigurationsonthesameinterface.

c.legacyddrcanuseaclstodefineinterestingtraffic.

d.hdlcorpppcanbeusedtoencapsulateisdndchannelinformation.

e.thebriinterfacesonisdnrouterswithdialerprofilesconfiguredcannotbelongtomultipledialerpools.

f.dialerprofilescannotuseaclstodefineinterestingtraffic.

ccnp

-bsci

6.whichofthefollowingisacharacteristicoflink-stateprotocols?

a.anetworktopologychangegeneratesanupdatethatisbroadcasttoeveryrouteron

thenetwork.

b.theperiodicroutingupdateintervalisslightlydifferentineachrouteronasubnet.

c.eachroutercreatesaroutingtablethatonlyincludesitsdirectlyconnectedneighbors.

d.link-stateprotocolssendroutingupdatesonlywhenthereisachangeinthenetwork

topology.

7.whatisthetermassociatedwithsynchronizingtheroutingtablesafteratopologychangeoccurs?

a.flooding

b.broadcasting

c.convergence

d.summarization

8.whichofthefollowingmustbedeterminedfirstbytherouterinordertoroutethedata?

a.thedistancemetricofthedata

b.thesourceaddressofthedata

c.whichroutingprotocolisusedbythedata

d.whethertheprotocolsuiteofthedataisactive

9.youareatechnicianatabc.abchasthesubnet/maskof172.29.100.0/26setasideforsmallremotelocations.eachlocationwillhave5ipdevicesconnectedtothenetwork.whichvlsmmaskwillprovidetheminimumnumberofhostsyourequire?

a./27

b./28

c./29

d./30

e./31

10.youareatraineetechnicianatabc.yourinstructorshowsyouthefollowingroutesummarizationentry:

192.168.134.0/22yourinstructorwantstoknowhowmanyclasscaddressesarecontainedinthissummarization.whatwouldyourreplybe?

a.1

b.2

c.4

d.8

e.16

-bcmsn

11.whichcommandenablesanetherchannelbundleonacatalyst2900xlswitch?

a.portgroup

b.setportchannelon

c.portetherchannelenable

d.setetherchannelportenable

12.whichtwostatementsaboutdynamicvlansaretrue?

（choosetwo）

a.eachswitchportisassignedtoaspecificvlan.

b.dynamicvlansrequireavlanmembershippolicyserver.

c.devicesareinthesamevlanregardlessofwhichporttheyattachto.

d.dynamicvlanassignmentaremadethroughthecommandinterface.

13.whichstatementiscorrectabout802.1qtrunking?

（selectallthatapply）

a.bothswitchesmustbeinthesamevtpdomain.

b.theencapsulationtypeofbothendsofthetrunkdoesnothavetomatch.

c.thenativevlanonbothendsofthetrunkmustbevlan1.

d.802.1qtrunkingcanonlybeconfiguredonalayer2port.

e.in802.1qtrunking,allvlanpacketsaretaggedonthetrunklink,exceptthenativevlan.

14.youneedtotakeadvantageoffastethernetports.whichtwoactionsavoidconfigurationproblemsthatcausetheporttobeautomaticallydisabled?

（choosetwo）

a.allowsomeportsinachanneltobedisabled.

b.configuretheportsinachannelasdynamicvlanports.

c.configureallportsinachanneltooperateatthesamespeedandduplexmode.

d.assignallportsinachanneltothesamevlanorconfigurethemastrunkports.

15.whatisthecauseofjitter?

a.variablequeuedelays

b.packetdrops

c.transmittingtoomanysmallpackets

d.compression

-bcran

16.regardingdhcp,dhcprelayanddhcpserveraremutuallyexclusive.

a.noneofthechoices.

b.true

c.falseonlyforcertainiosversion

d.false

e.falseonlyforiosversionbelowv10

17.alapdaddressfieldcanbe1or2byteslong.

a.true

b.false

c.trueonlyintheus

d.trueonlyinasia

e.trueonlyineurope

18.whichofthefollowingarevalidfunctionsofthelockdtemodemattribute（chooseallthatapply）?

a.disableuart.

b.enableuart.

c.locksthedataspeedbetweenthecomputermotherboardandthers232port.

d.locksthedataspeedbetweenthemodemandthedtedevice.

19.whichofthefollowingarenotthevalidtypesofatmaddresses（chooseallthatapply）?

a.dcc

b.gct

c.bsp

d.icd

e.nsap

f.aed

20.whichofthefollowingarenotthevalidtypesofx.25plppacketfields（chooseallthatapply）?

a.userdata

b.lci

c.gfi

d.pti

e.noneofthechoices.

-cit

21.youareatechnicianat.yournewlyappointedabctraineewantstoknowwhatthesimilaritiesbetweentopologydiagramsandnetworkconfigurationtablesare.

whatwouldyourreplybe?

（chooseallthatapply.）

a.bothsharefewcomponents.

b.bothsharemanyofthesamecomponents.

c.bothdefinephysicalmemorycomponents.

d.bothareusedfortroubleshooting.

e.bothuselinesandsymbolstorepresentnetworkcomponents.

22.youareatechnicianat.yournewlyappointedabctraineewantstoknowwhatthedefaultactionfortheoutputofdebugandsystemerrormessagesis.whatwouldyourreplybe?

a.outputgoestotheremoteconsoleifloggingisoff.

b.outputissenttotheconsoleterminal.

c.errorloggingautomaticallyinvokesdebugoutputtothedesignatedtftpserver.

d.outputconfigurationrequiresatftpservertowritefiles

e.outputiswrittentoasyslogserver.

23.youarethenetworkadministratorat.abchasaswitchednetwork.youwanttocontrolthedesignationofthespanning-treerootbridgeintheabcnetwork.whatshouldyoudo?

a.byenablinguplink-fastontheportsofthedesiredswitch.

b.byloweringthebridgepriorityonthedesiredswitch.

c.bysettingalowermacaddressonthedesignatedswitch.

d.byraisingthebridgeidononeswitch.

24.youareatechnicianatabc.youreceiveareportfromseveralabcuserswhocomplainthattheygetslowresponseswhensendingandreceivingemail,especiallywhenbrowsingtheinternet.youinvestigatethecomplaintbycheckingtheoutputofapingcommandissuedfromhercomputerandfindthatitindicatesintermittedsuccessandfailuresmessages,whenattemptingtocontacttheemailserver.atracerttothecorporateinternetgatewayroutershowshighlatencyandoccasionaltimeoutmessages.

whatwouldbethemosteffectivetroubleshootingapproachifyouaretodeterminethecauseoftheslowresponsetime?

a.bottom-upapproach

b.randomaccessapproach

c.divideandconquerapproach

d.top-downapproach

e.top-downrule-outapproach

25.youareatechnicianat.yournewlyappointedabctraineewantstoknowwhatfeaturesmakeospfmoresuitablethanrpinlargenetworkinstallations.whatwouldyourreplybe?

（chooseallthatapply.）

a.diffusingupdatealgorithm

b.nohopcountlimitation

c.higherroutingupdateoverhead

d.fasterconvergence

e.lowerroutingupdateoverhead

ccie

26.youarethenetworkadministratoratabc.youaretroubleshootinganetworkproblem.youwanttotracetheroutetoaunixworkstationthatyouwanttoreachthroughtheinternet.however,traceroutedoesnotwork.

currently,thereisaninboundaccess-listappliedtotheserialinterfaceonrouter1.anentryintheaccess-liststates"access-list101permittcpanyany".whataccess-listentrymayyouneedtobeaddedtotheaccess-listinordertogettraceroutetowork?

a.access-list101permitudpanyany

b.access-list101permiticmpanyanytime-exceededaccess-list101permiticmpanyanyport-unreachable

c.access-list101permiticmpanyanytime-exceededaccess-list101permiticmpanyanynet-unreachable

d.access-list101permiticmpanyanyechoaccess-list101permiticmpanyanynet-unreachable

e.access-list101permitudpanyanyaccess-list101permiticmpanyanyprotocol-unreachable

27.whatdoesthebgpbackdoorcommanddo?

a.itchangesthedistanceofanibgprouteto20.

b.itchangesthedistanceofanebgprouteto200.

c.itchangesthedistanceofanigprouteto20.

d.itdoesnoteffectanychangesindistanceoftheroute.

e.itchangesthedistanceofanigrprouteto200.

28.whichofthefollowingdnsresourcerecordsisnotvalid?

a.ns

b.ptr

c.mx

d.fqdn

e.a

29.whichofthefollowingfeaturesisprovidedbyripv2thatwerepreviouslynotpossiblewithripv1?

（chooseallthatapply.）

a.classlessroutingandsplit-horizon.

b.poisonreverseandupdatingtomulticastaddresses.

c.poisonreverseandclasslessrouting.

d.classlessroutingandupdatingtomulticastaddresses.

e.routetagandclasslessrouting.

30.whichofthefollowingstatementsisvalidwhentakingcustomqueuingintoaccount?

a.customqueuinghastheabilitytorestrictaparticulartypeof