ccnp300 115題庫0選擇題v2 0戰(zhàn)報1000人

ExamA

QUESTION1

WhatisthemaximumnumberofswitchesthatcanbestackedusingCiscoStackWise?

4

5

8

9

10

13

CorrectAnswer:DSection:(none)Explanation

Explanation/Reference:

Explanation/Reference:

Explanation:

Upto9CiscoCatalystswitchescanbestackedtogethertobuildsinglelogicalStackWiseswitchsinceCiscoIOSXERelease3.3.0SE.PriortoCiscoIOSXE

Release3.3.0SE,upto4CiscoCatalystswitchescouldbestackedtogether.

Reference:

/c/en/us/products/collateral/switches/catalyst-3850-series-

switches/qa_c67-722110.html

QUESTION2

Anetworkengineerwantstoaddanewswitchtoanexistingswitchstack.Whichconfigurationmustbeaddedtothenewswitchbeforeitcanbeaddedtotheswitchstack?

Noconfigurationmustbeadded.

stackID

IPaddress

VLANinformation

VTPinformation

CorrectAnswer:ASection:(none)Explanation

Explanation/Reference:

Explanation/Reference:

Explanation:

SwitchStackOfflineConfiguration

Youcanusetheofflineconfigurationfeaturetoprovision(tosupplyaconfigurationto)anewswitchbeforeitjoinstheswitchstack.Youcanconfigureinadvance

thestackmembernumber,theswitchtype,andtheinter-facesassociatedwithaswitchthatisnotcurrentlypartofthestack.Theconfigurationthatyoucreateon

theswitchstackiscalledtheprovisionedconfiguration.Theswitchthatisaddedtotheswitchstackandthatre-ceivesthisconfigurationiscalledtheprovisioned

switch.

Youmanuallycreatetheprovisionedconfigurationthroughtheswitchstack-member-numberprovisiontypeglobalconfigurationcommand.Theprovisioned

configurationisautomaticallycreatedwhenaswitchisaddedtoaswitchstackandwhennoprovisionedconfigurationexists.

Whenyouconfiguretheinterfacesassociatedwithaprovisionedswitch(forexample,aspartofaVLAN),theswitchstackacceptstheconfiguration,andthe

informationappearsintherunningconfiguration.Theinterfaceassociatedwiththeprovisionedswitchisnotactive,operatesasifitisadministrativelyshutdown,

andthenoshutdowninterfaceconfigurationcommanddoesnotreturnittoactiveservice.Theinterfaceassociatedwiththeprovisionedswitchdoesnotappearin

thedisplayofthespecificfeature;forexample,itdoesnotappearintheshowvlanuserEXECcommandoutput.

Theswitchstackretainstheprovisionedconfigurationintherunningconfigurationwhetherornottheprovi-sionedswitchispartofthestack.Youcansavethe

provisionedconfigurationtothestartupconfigurationfilebyenteringthecopyrunning-configstartup-configprivilegedEXECcommand.Thestartupconfigurationfile

ensuresthattheswitchstackcanreloadandcanusethesavedinformationwhetherornottheprovisionedswitchispartoftheswitchstack.

EffectsofAddingaProvisionedSwitchtoaSwitchStack

Whenyouaddaprovisionedswitchtotheswitchstack,thestackapplieseithertheprovisionedconfigurationorthedefaultconfiguration.Table5-1liststheevents

thatoccurwhentheswitchstackcomparestheprovisionedconfigurationwiththeprovisionedswitch.Table5-1ResultsofComparingtheProvisionedConfigurationwiththeProvisionedSwitch

ScenarioResult

Thestackmembernum-1.IfthestackmembernumberTheswitchstackappliesbersandtheswitchtypesoftheprovisionedswitchtheprovisionedconfigura-match.matchesthestackmembernum-tiontotheprovisionedberintheprovisionedconfigura-switchandaddsittothetiononthestack,andstack.

2.Iftheswitchtypeoftheprovi-sionedswitchmatchestheswitchtypeintheprovisionedconfigura-tiononthestack.

Thestackmembernum-1.IfthestackmembernumberTheswitchstackappliesbersmatchbuttheswitchoftheprovisionedswitchthedefaultconfigurationtotypesdonotmatch.matchesthestackmembernum-theprovisionedswitchandberintheprovisionedconfigura-tiononthestack,butaddsittothestack.

2.Theswitchtypeoftheprovi-Theprovisionedconfigura-sionedswitchdoesnotmatchthetionischangedtoreflectswitchtypeintheprovisionedthenew

information.

configurationonthestack.

Thestackmembernum-Theswitchstackappliesberisnotfoundinthepro-thedefaultconfigurationtovisionedconfiguration.theprovisionedswitchandaddsittothestack.

Theprovisionedconfigura-tionischangedtoreflectthenewinformation.

Thestackmembernum-ThestackmasterassignsanewTheswitchstackappliesberoftheprovisionedstackmembernumbertothepro-theprovisionedconfigura-switchisinconflictwithanvisionedswitch.tiontotheprovisionedexistingstackmember.switchandaddsittotheThestackmembernumbersandstack.

theswitchtypesmatch:

Theprovisionedconfigura-1.

Ifthenewstackmembertionischangedtoreflectnumberoftheprovisionedswitchthenewinformation.matchesthestackmembernum-berintheprovisionedconfigura-tiononthestack,and

2.

Iftheswitchtypeoftheprovi-sionedswitchmatchestheswitchtypeintheprovisionedconfigura-tiononthestack.

ThestackmembernumbersTheswitchstackappliesmatch,buttheswitchtypesdothedefaultconfigurationtonotmatch:theprovisionedswitchandaddsittothestack.

1.

IfthestackmembernumberoftheprovisionedswitchTheprovisionedconfigura-matchesthestackmembernum-tionischangedtoreflectberintheprovisionedconfigura-thenewinformation.tiononthestack,but

2.

Theswitchtypeoftheprovi-sionedswitchdoesnotmatchtheswitchtypeintheprovisionedconfigurationonthestack.

Thestackmembernum-Theswitchstackappliesberoftheprovisionedthedefaultconfigurationtoswitchisnotfoundinthetheprovisionedswitchandprovisionedconfiguration.addsittothestack.Reference:

/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-

2_55_se/configuration/guide/3750xscg/swstack.html

QUESTION3

Whatpercentageofbandwidthisreducedwhenastackcableisbroken?

0

25

50

75

100

CorrectAnswer:CSection:(none)Explanation

Explanation/Reference:

Explanation/Reference:

Explanation:PhysicalSequentialLinkageTheswitchesarephysicallyconnectedsequentially,asshowninFigure3.Abreakinanyoneofthecableswillresultinthestackbandwidthbeingreducedtohalfofitsfullcapacity.Subsecondtimingmechanismsdetecttrafficproblemsandimmediatelyinstitutefailover.Thismechanismrestoresdualpathflowwhenthetimingmechanismsdetectrenewedactivityonthecable.

Figure3.CiscoStackWiseTechnologyResilientCabling

Reference:

/c/en/us/products/collateral/switches/catalyst-3750-series-

switches/prod_white_paper09186a00801b096a.html

QUESTION4

Refertotheexhibit.

WhichsetofconfigurationswillresultinallportsonbothswitchessuccessfullybundlingintoanEtherChannel?

switch1channel-group1modeactiveswitch2channel-group1modeauto

switch1channel-group1modedesirableswitch2channel-group1modepassive

switch1channel-group1modeonswitch2channel-group1modeauto

switch1channel-group1modedesirableswitch2channel-group1modeauto

CorrectAnswer:DSection:(none)Explanation

Explanation/Reference:

Explanation/Reference:

Explanation:

Thedifferentetherchannelmodesaredescribedinthetablebelow:

ModeDescription

activePlacesaninterfaceintoanactivenegotiatingstate,inwhichtheinterfacestartsnegotiationswithotherinterfacesbysendingLACPpackets.

autoPlacesaninterfaceintoapassivenegotiatingstate,inwhichtheinterfacere-spondstoPAgPpacketsitreceivesbutdoesnotstartPAgPpacketnegotia-tion.

ThissettingminimizesthetransmissionofPAgPpackets.

desirablePlacesaninterfaceintoanactivenegotiatingstate,inwhichtheinterfacestartsnegotiationswithotherinterfacesbysendingPAgPpackets.

onForcestheinterfaceintoanEtherChannelwithoutPAgPorLACP.Withtheonmode,ausableEtherChannelexistsonlywhenaninterfacegroupintheonmode

isconnectedtoanotherinterfacegroupintheonmode.

passivePlacesaninterfaceintoapassivenegotiatingstate,inwhichtheinterfacere-spondstoLACPpacketsthatitreceives,butdoesnotstartLACPpacketne-gotiation.ThissettingminimizesthetransmissionofLACPpackets.

BoththeautoanddesirablePAgPmodesallowinterfacestonegotiatewithpartnerinterfacestodetermineiftheycanformanEtherChannelbasedoncriteriasuch

asinterfacespeedand,forLayer2EtherChannels,trunkingstateandVLANnumbers.

InterfacescanformanEtherChannelwhentheyareindifferentPAgPmodesaslongasthemodesarecompatible.Forexample:

AninterfaceinthedesirablemodecanformanEtherChannelwithanotherinterfacethatisinthedesirableorautomode.

AninterfaceintheautomodecanformanEtherChannelwithanotherinterfaceinthedesirablemode.AninterfaceintheautomodecannotformanEtherChannelwithanotherinterfacethatisalsointheautomodebecauseneitherinterfacestartsPAgPnegotiation.

Aninterfaceintheonmodethatisaddedtoaportchannelisforcedtohavethesamecharacteristicsasthealreadyexistingonmodeinterfacesinthechannel.

Reference:

/c/en/us/td/docs/switches/lan/catalyst3550/software/release/12-

1_13_ea1/configuration/guide/3550scg/swethchl.html

QUESTION5

Refertotheexhibit.

HowcanthetrafficthatismirroredouttheGigabitEthernet0/48portbelimitedtoonlytrafficthatisreceivedortransmittedinVLAN10ontheGigabitEthernet0/1port?

ChangetheconfigurationforGigabitEthernet0/48sothatitisamemberofVLAN10.

AddanaccesslisttoGigabitEthernet0/48tofilterouttrafficthatisnotinVLAN10.

ApplythemonitorsessionfiltergloballytoallowonlytrafficfromVLAN10.

ChangethemonitorsessionsourcetoVLAN10insteadofthephysicalinterface.

CorrectAnswer:CSection:(none)Explanation

Explanation/Reference:

Explanation/Reference:

Explanation:

Tostartanewflow-basedSPAN(FSPAN)sessionorflow-basedRSPAN(FRSPAN)sourceordestinationsession,ortolimit(filter)SPANsourcetraffictospecific

VLANs,usethemonitorsessionfilterglobalconfigurationcommand.

UsageGuidelines

YoucansetacombinedmaximumoftwolocalSPANsessionsandRSPANsourcesessions.Youcanhaveatotalof66SPANandRSPANsessionsonaswitchor

switchstack.YoucanmonitortrafficonasingleVLANoronaseriesorrangeofportsorVLANs.YouselectaseriesorrangeofVLANsbyusingthe[,|-]options.

IfyouspecifyaseriesofVLANs,youmustenteraspacebeforeandafterthecomma.IfyouspecifyarangeofVLANs,youmustenteraspacebeforeandafterthe

hyphen(-).VLANfilteringreferstoanalyzingnetworktrafficonaselectedsetofVLANsontrunksourceports.Bydefault,allVLANsaremonitoredontrunksource

ports.Youcanusethemonitorsessionsession_numberfiltervlanvlan-idcommandtolimitSPANtrafficontrunksourceportstoonlythespecifiedVLANs.

VLANmonitoringandVLANfilteringaremutuallyexclusive.IfaVLANisasource,VLANfilteringcannotbeenabled.IfVLANfilteringisconfigured,aVLANcannot

becomeasource.Reference:

/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/network_m

anagement/command_reference/b_nm_3se_3850_cr/b_nm_3se_3850_cr_chapter_010.html#wp3875419997

QUESTION6

Refertotheexhibit.

Anetworkengineerwantstoanalyzeallincomingandoutgoingpacketsforaninterfacethatisconnectedtoanaccessswitch.Whichthreeitemsmustbeconfiguredtomirrortraffictoapacketsnifferthatisconnectedtothedistributionswitch?(Choosethree.)

AmonitorsessiononthedistributionswitchwithaphysicalinterfaceasthesourceandtheremoteSPANVLANasthedestination

AremoteSPANVLANonthedistributionandaccesslayerswitch

AmonitorsessionontheaccessswitchwithaphysicalinterfacesourceandtheremoteSPANVLANasthedestination

AmonitorsessiononthedistributionswitchwitharemoteSPANVLANasthesourceandphysicalinterfaceasthedestination

AmonitorsessionontheaccessswitchwitharemoteSPANVLANsourceandthephysicalinterfaceasthedestination

Amonitorsessiononthedistributionswitchwithaphysicalinterfaceasthesourceandaphysicalinterfaceasthedestination

CorrectAnswer:BCDSection:(none)Explanation

Explanation/Reference:

Explanation/Reference:

Explanation:YoucananalyzenetworktrafficpassingthroughportsorVLANsbyusingSPANorRSPANtosendacopyofthetraffictoanotherportontheswitchoronanotherswitchthathasbeenconnectedtoanetworkanalyzerorothermonitoringorsecuritydevice.SPANcopies(ormirrors)trafficreceivedorsent(orboth)onsourceportsorsourceVLANstoadestinationportforanalysis.RSPANsupportssourceports,sourceVLANs,anddestinationportsondifferentswitches(ordifferentswitchstacks),enablingremotemonitoringofmultipleswitchesacrossyournetwork.ThetrafficforeachRSPANsessioniscarriedoverauser-specifiedRSPANVLANthatisdedicatedforthatRSPANsessioninallparticipatingswitches.TheRSPANtrafficfromthesourceportsorVLANsiscopiedintotheRSPANVLANandforwardedovertrunkportscarryingtheRSPANVLANtoadestinationsessionmonitoringtheRSPANVLAN.Each

RSPANsourceswitchmusthaveeitherportsorVLANsasRSPANsources.ThedestinationisalwaysaphysicalportReference:

/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/

release/12-2_55_se/configuration/guide/3750xscg/swspan.html

QUESTION7

AfteranEtherChannelisconfiguredbetweentwoCiscoswitches,interfaceportchannel1isinthedown/downstate.SwitchAisconfiguredwithchannel-group1modeactive,whileSwitchBisconfiguredwithchannel-group1modedesirable.WhyistheEtherChannelbundlenotworking?

TheswitchesareusingmismatchedEtherChannelnegotiationmodes.

Theswitchportsarenotconfiguredintrunkingmode.

LACPprioritymustbeconfiguredonbothswitches.

ThechannelgroupidentifiermustbedifferentforSwitchAandSwitchB.

CorrectAnswer:ASection:(none)Explanation

Explanation/Reference:

Explanation/Reference:

Explanation:

Herewehaveasituationwhereoneswitchisusingactivemode,whichisanLACPmode,andtheotherisusingdesirable,whichisaPAGPmode.Youcannotmix

theLACPandPAGPprotocolstoformanetherchannel.Hereisasummaryofthevariousetherchannelmodes:

EtherChannelPAgPModesModeDescription

autoPlacesaportintoapassivenegotiatingstate,inwhichtheportrespondstoPAgPpacketsitreceivesbutdoesnotstartPAgPpacketnegotiation.Thissetting

minimizesthetransmissionofPAgPpackets.

ThismodeisnotsupportedwhentheEtherChannelmembersarefromdiffer-entswitchesintheswitchstack(cross-stackEtherChannel).

desirablePlacesaportintoanactivenegotiatingstate,inwhichtheportstartsnegotia-tionswithotherportsbysendingPAgPpackets.

ThismodeisnotsupportedwhentheEtherChannelmembersarefromdiffer-entswitchesintheswitchstack(cross-stackEtherChannel).

EtherChannelLACPModesModeDescription

activePlacesaportintoanactivenegotiatingstateinwhichtheportstartsnegotia-tionswithotherports

bysendingLACPpackets.

passivePlacesaportintoapassivenegotiatingstateinwhichtheportrespondstoLACPpacketsthatitreceives,butdoesnotstartLACPpacketnegotiation.This

settingminimizesthetransmissionofLACPpackets.

Reference:

/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-

2_55_se/configuration/guide/scg_2960/swethchl.html

QUESTION8

AnEtherChannelbundlehasbeenestablishedbetweenaCiscoswitchandacorporatewebserver.ThenetworkadministratornoticedthatonlyoneoftheEtherChannellinksisbeingutilizedtoreachthewebserver.WhatshouldbedoneontheCiscoswitchtoallowforbetterEtherChannelutilizationtothecorporatewebserver?

EnableCiscoExpressForwardingtoallowformoreeffectivetrafficsharingovertheEtherChannelbundle.

AdjusttheEtherChannelload-balancingmethodbasedondestinationIPaddresses.

DisablespanningtreeonallinterfacesthatareparticipatingintheEtherChannelbundle.

Uselink-statetrackingtoallowforimprovedloadbalancingoftrafficuponlinkfailuretotheserver.

AdjusttheEtherChannelload-balancingmethodbasedonsourceIPaddresses.

CorrectAnswer:ESection:(none)Explanation

Explanation/Reference:

Explanation/Reference:

Explanation:EtherChannelloadbalancingcanuseMACaddresses,IPaddresses,orLayer4portnumbers,andeithersourcemode,destinationmode,orboth.ThemodeyouselectappliestoallEtherChannelsthatyouconfigureontheswitch.Usetheoptionthatprovidesthegreatestvarietyinyourconfiguration.Forexample,ifthetrafficonachannelonlygoestoasingleMACaddress(whichisthecaseinthisexample,sincealltrafficisgoingtothesamewebserver),useofthedestinationMACaddressresultsinthechoiceofthesamelinkinthechanneleachtime.UseofsourceaddressesorIPaddressescanresultinabetterloadbalance.Reference:

/c/en/us/support/docs/lan-switching/

etherchannel/12023-4.html

QUESTION9

InterfaceFastEthernet0/1isconfiguredasatrunkinterfacethatallowsallVLANs.Thiscommandisconfiguredglobally:monitorsession2filtervlan1-8,39,52

Whatistheresultoftheimplementedcommand?

AllVLANtrafficissenttotheSPANdestinationinterface.

TrafficfromVLAN4isnotsenttotheSPANdestinationinterface.

FilteringatrunkedSPANporteffectivelydisablesSPANoperationsforallVLANs.

Thetrunk'snativeVLANmustbechangedtosomethingotherthanVLAN1.

TrafficfromVLANs1to8,39,and52isreplicatedtotheSPANdestinationport.

CorrectAnswer:ESection:(none)Explanation

Explanation/Reference:

Explanation/Reference:

Explanation:The"monitorsessionfilter"commandisusedtospecifywhichVLANSaretobeportmirroredusingSPAN.ThisexampleshowshowtomonitorVLANs1through5andVLAN9whentheSPANsourceisatrunkinterface:Switch(config)#monitorsession2filtervlan1-5,9Reference:

/

c/en/us/td/docs/switches/lan/catalyst4500/12-2/25ew/configuration/guide/conf/span.html/index.html#wp1066836

QUESTION10

AnetworkengineernoticesinconsistentCiscoDiscoveryProtocolneighborsaccordingtothediagramthatisprovided.TheengineernoticesonlyasingleneighborthatusesCiscoDiscoveryProtocol,butithasseveralroutingneighborrelationships.Whatwouldcausetheoutputtoshowonlythesingleneighbor?

TheroutersareconnectedviaaLayer2switch.

IProutingisdisabledonneighboringdevices.

CiscoExpressForwardingisenabledlocally.

CiscoDiscoveryProtocoladvertisementsareinconsistentbetweenthelocalandremotedevices.

CorrectAnswer:ASection:(none)Explanation

Explanation/Reference:Explanation/Reference:Explanation:

Ifalloftheroutersareconnectedtoeachotherusingalayer2switch,theneachrouterwillonlyhavethesingleswitchportthatitconnectstoasitsneighbor.Even

thoughmultipleroutingneighborscanbeformedoveralayer2network,onlythephysicalportthatitconnectstowillbeseenasaCDPneighbor.CDPcanbeused

todeterminethephysicaltopology,butnotnecessarilythelogicaltopology.

QUESTION11

Aftertheimplementationofseveraldifferenttypesofswitchesfromdifferentvendors,anetworkengineernoticesthatdirectlyconnecteddevicesthatuseCiscoDiscoveryProtocolarenotvisible.Whichvendor-neutralprotocolcouldbeusedtoresolvethisissue?

LocalAreaMobility

LinkLayerDiscoveryProtocol

NetFlow

DirectedResponseProtocol

CorrectAnswer:BSection:(none)Explanation

Explanation/Reference:

Explanation/Reference:

Explanation:

TheLinkLayerDiscoveryProtocol(LLDP)isavendor-neutrallinklayerprotocolintheInternetProtocolSuiteusedbynetworkdevicesforadvertisingtheiridentity,

capabilities,andneighborsonanIEEE802localareanetwork,principallywiredEthernet.LLDPperformsfunctionssimilartoseveralproprietaryprotocols,suchas

theCiscoDiscoveryProtocol(CDP).Reference:

/wiki/

Link_Layer_Discovery_Protocol

QUESTION12

SeveralnewswitcheshavebeenaddedtotheexistingnetworkasVTPclients.AllofthenewswitcheshavebeenconfiguredwiththesameVTPdomain,password,andversion.However,VLANsarenotpassingfromtheVTPserver(existingnetwork)totheVTPclients.Whatmustbedonetofixthis?

RemovetheVTPdomainnamefromallswitcheswith"null"andthenreplaceitwiththenewdomainname.

ConfigureadifferentnativeVLANonallnewswitchesthatareconfiguredasVTPclients.

ProvisiononeofthenewswitchestobetheVTPserverandduplicateinformationfromtheexistingnetwork.

EnsurethatallswitchinterconnectsareconfiguredastrunkstoallowVTPinformationtobetransferred.

CorrectAnswer:DSection:(none)Explanation

Explanation/Reference:

Explanation/Reference:

Explanation:

VTPallowsswitchestoadvertiseVLANinformationbetweenothermembersofthesameVTPdomain.

VTPallowsaconsistentviewoftheswitchednetworkacross

allswitches.ThereareseveralreasonswhytheVLANinformationcanfailtobeexchanged.VerifytheseitemsifswitchesthatrunVTPfailtoexchangeVLAN

information:

VTPinformationonlypassesthroughatrunkport.Makesurethatallportsthatinterconnectswitchesareconfiguredastrunksandareactuallytrunking.MakesurethatifEtherChannelsarecreatedbetweentwoswitches,onlyLayer2EtherChannelspropagateVLANinformation.

MakesurethattheVLANsareactiveinallthedevices.

OneoftheswitchesmustbetheVTPserverinaVTPdomain.AllVLANchangesmustbedoneonthisswitchinordertohavethempropagatedtotheVTP

clients.·TheVTPdomainnamemustmatchanditiscasesensitive.CISCOandciscoaretwodifferentdomainnames.

Makesurethatnopasswordissetbetweentheserverandclient.Ifanypasswordisset,makesurethatthepasswordisthesameonbothsides.

Reference:

/en/US/tech/tk389/tk689/technologies_tech_note09186a0080890613.shtml

QUESTION13

AfterimplementingVTP,theextendedVLANsarenotbeingpropagatedtootherVTPswitches.WhatshouldbeconfiguredforextendedVLANs?

VTPdoesnotsupportextendedVLANsandshouldbemanuallyaddedtoallswitches.

EnableVTPversion3,whichsupportsextendedVLANpropagation.

VTPauthenticationisrequiredwhenusingextendedVLANsbecauseoftheirabilitytocausenetworkinstability.

EnsurethatallswitchesrunthesameCiscoIOSversion.ExtendedVLANswillnotpropagatetodifferentIOSversionswhenextendedVLANsareinuse.

CorrectAnswer:BSection:(none)Explanation

Explanation/Reference:

Explanation/Reference:

Explanation:

VTPversion1andVTPversion2donotpropagateconfigurationinformationforextended-rangeVLANs(VLANnumbers1006to4094).Youmustconfigureextended-rangeVLANsmanuallyoneachnetworkdevice.

VTPversion3supportsextended-rangeVLANs(VLANnumbers1006to4094).IfyouconvertfromVTPversion3toVTPversion2,theVLANsintherange

1006to4094areremovedfromVTPcontrol.Reference:

/en/US/docs/switches/lan/

catalyst6500/ios/15.1SY/config_guide/sup2T/vtp.pdf

QUESTION14

Refertotheexhibit.

SwitchA,B,andCaretrunkedtogetherandhavebeenproperlyconfiguredforVTP.SwitchCreceivesVLANinformationfromtheVTPserverSwitchA,butSwitchBdoesnotreceiveanyVLANinformation.Whatisthemostprobablecauseofthisbehavior?

SwitchBisconfiguredintransparentmode.

SwitchBisconfiguredwithanaccessporttoSwitchA,whileSwitchCisconfiguredwithatrunkporttoSwitchB.

TheVTPrevisionnumberoftheSwitchBishigherthanthatofSwitchA.

ThetrunkbetweenSwitchAandSwitchBismisconfigured.

CorrectAnswer:ASection:(none)Explanation

Explanation/Reference:

Explanation:

VTPtransparentswitchesdonotparticipateinVTP.AVTPtransparentswitchdoesnotadvertiseitsVLANconfigurationanddoesnotsynchronizeitsVLAN

configurationbasedonreceivedadvertisements,buttransparentswitchesdoforwardVTPadvertisementsthattheyreceiveouttheirtrunkportsinVTPVersion2.

Reference:

/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml

QUESTION15

Refertotheexhibit.

SwitchA,B,andCaretrunkedtogetherandhavebeenproperlyconfiguredforVTP.SwitchBhasallVLANs,butSwitchCisnotreceivingtrafficfromcertainVLANs.Whatwouldcausethisissue?

AVTPauthenticationmismatchoccurredbetweenSwitchAandSwitchB.

TheVTPrevisionnumberofSwitchBishigherthanthatofSwitchA.

VTPpruningisconfiguredgloballyonallswitchesanditremovedVLANsfromthetrunkinterfacethatisconnectedtoSwitchC.

ThetrunkbetweenSwitchAandSwitchBismisconfigured.

CorrectAnswer:CSection:(none)Explanation

Explanation/Reference:

Explanation/Reference:

Explanation:

VTPpruningincreasesnetworkavailablebandwidthbyrestrictingfloodedtraffictothosetrunklinksthatthetrafficmustusetoreachthedestinationdevices.

WithoutVTPpruning,aswitchfloodsbroadcast,multicast,andunknownunicasttrafficacrossalltrunklinkswithinaVTPdomaineventhoughreceivingswitches

mightdiscardthem.VTPpruningisdisabledbydefault.VTPpruningblocksunneededfloodedtraffictoVLANsontrunkportsthatareincludedinthepruning-

eligiblelist.ThebestexplanationforwhyswitchCisnotseeingtrafficfromonlysomeoftheVLANs,isthatVTPpruninghasbeenconfigured.

QUESTION16

Aftertherecentupgradeoftheswitchinginfrastructure,thenetworkengineernoticesthattheportrolesthatwereonce"blocking"arenowdefinedas"alternate"and"backup."Whatisthereasonforthischange?

ThenewswitchesareusingRSTPinsteadoflegacyIEEE802.1DSTP.

IEEE802.1DSTPandPortFasthavebeenconfiguredbydefaultonallnewlyimplementedCiscoCatalystswitches.

TheadministratorhasdefinedtheswitchastherootintheSTPdomain.

TheportroleshavebeenadjustedbasedontheinterfacebandwidthandtimersofthenewCiscoCatalystswitches.

CorrectAnswer:ASection:(none)Explanation

Explanation/Reference:

Explanation/Reference:

Explanation:

RSTPworksbyaddinganalternativeportandabackupportcomparedtoSTP.Theseportsareallowedtoimmediatelyentertheforwardingstateratherthan

passivelywaitforthenetworktoconverge.RSTPbridgeportroles:

*

RootportAforwardingportthatistheclosesttotherootbridgeintermsofpathcost

*

DesignatedportAforwardingportforeveryLANsegment

*

Alternatepor