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Question1
AfteraredundantrouteprocessorfailureoccursonaLayer3device,whichmechanismallowsforpacketstobeforwardedfromaneighboringrouterbasedonthemostrecenttables?
A.RPVST+
B.RPfailover
C.BFD
D.NSF
Answer:
D
Question2
WhatisthedifferencesbetweenTCAMandtheMACaddresstable?
A.RouterprefixlookupshappensinCAM.MACaddresstablelookupshappeninTCAM
B.TheMACaddresstablesupportspartialmatches.TCAMrequiresanexactmatch
C.TheMACaddresstableiscontainedinCAM.ACLandQoSinformationisstoredinTCAM
D.TCAMisusedtomakeLayer2forwardingdecisions.CAMisusedtobuildroutingtables
Answer:
C
Explanation
Whenusing
TernaryContentAddressableMemory
(TCAM)insideroutersit’susedforfasteraddresslookupthatenablesfastrouting.
Inswitches
ContentAddressableMemory
(CAM)isusedforbuildingandlookupofmacaddresstablethatenablesL2forwardingdecisions.
BesidesLongest-PrefixMatching,TCAMintoday’sroutersandmultilayerSwitchdevicesareusedtostoreACL,QoSandotherthingsfromupper-layerprocessing.
Question3
WhichtwosouthboundinterfacesoriginatefromCiscoDNACenterandterminateatfabricunderlayswitches?(Choosetwo)
A.UDP67:DHCP
B.ICMP:Discovery
C.TCP23:Telnet
D.UDP162:SNMP
E.UDP6007:NetFlow
Answer:
BD
Explanation
Inthefigurebelow,wecanseeICMP&SNMPcanreachtounderlayswitches.
Question4
Whatisthefunctionofacontrol-planenodeinaCiscoSD-Accesssolution?
A.toconnectAPsandwirelessendpointstotheSD-Accessfabric
B.toconnectexternalLayer3networkstotheSDAccessfabric
C.toimplementpoliciesandcommunicatewithnetworksoutsidethefabric
D.torunamappingsystemthatmanagesendpointtonetworkdevicerelationships
Answer:
D
Explanation
Control-PlaneNodes
–MapSystemthatmanagesEndpointtoDevicerelationships
FabricBorderNodes–AFabricdevice(e.g.Core)thatconnectsExternalL3network(s)totheSDAFabric
FabricEdgeNodes–AFabricdevice(e.g.AccessorDistribution)thatconnectsWiredEndpointstotheSDAFabric
FabricWirelessController–AFabricdevice(WLC)thatconnectsAPsandWirelessEndpointstotheSDAFabric
Reference:
/c/dam/m/hr_hr/training-events/2019/cisco-connect/pdf/VH-Cisco-SD-Access-Connecting.pdf
Question5
Refertotheexhibit.WhatistheresultwhenaswitchthatisrunningPVST+isaddedtothisnetwork?
A.Spanningtreeisdisabledautomaticallyonthenetwork
B.DSW2operatesinRapidPVST+andthenewswitchoperatesinPVST+
C.BothswitchesoperateinthePVST+mode
D.BothswitchesoperateintheRapidPVST+mode
Answer:
B
Explanation
FromtheoutputweseeDSW2isrunninginRSTPmode(infactRapidPVST+modeasCiscodoesnotsupportRSTPalone).WhenanewswitchrunningPVST+modeisaddedtothetopology,theykeeprunningtheoldSTPinstancesasRSTP(infactRapidPVST+)iscompatiblewithPVST+.
Question6
Whatisacharacteristicofanext-generationfirewall?
A.requiredineachlayerofthenetwork
B.filterstrafficusingLayer3andLayer4informationonly
C.onlyrequiredatthenetworkperimeter
D.providesintrusionprevention
Answer:
D
Explanation
Anextgenerationfirewalladdsadditionalfeaturessuchasapplicationcontrol,integrated
intrusionprevention
(IPS)andoftenmoreadvancedthreatpreventioncapabilitieslikesandboxing.
Question7
WhichmeasureisusedbyanNTPservertoindicateitsclosenesstotheauthoritativetimesource?
A.stratum
B.hopcount
C.timezone
D.latency
Answer:
A
Explanation
Thestratumlevelsdefinethedistancefromthereferenceclock.Areferenceclockisastratum0devicethatisassumedtobeaccurateandhaslittleornodelayassociatedwithit.Stratum0serverscannotbeusedonthenetworkbuttheyaredirectlyconnectedtocomputerswhichthenoperateasstratum-1servers.Astratum1timeserveractsasaprimarynetworktimestandard.
Astratum2serverisconnectedtothestratum1server;thenastratum3serverisconnectedtothestratum2serverandsoon.Astratum2servergetsitstimeviaNTPpacketrequestsfromastratum1server.Astratum3servergetsitstimeviaNTPpacketrequestsfromastratum-2server…
Question8
WhichtworesultsoccurifCiscoDNACenterlosesconnectivitytodevicesintheSD-Accessfabric?(Choosetwo)
A.AlldevicesreloadafterdetectinglossofconnectiontoCiscoDNACenter
B.Alreadyconnectedusersareunaffected,butnewuserscannotconnect
C.Usersloseconnectivity
D.CiscoDNACenterisunabletocollectmonitoringdatainAssurance
E.Userconnectivityisunaffected
Answer:
DE
Explanation
IfyouhaveCiscoSD-AccessimplementedandDNACenterbecomesunreachablethenthewiredandwirelessnetworkwillcontinuetoforwardpacketsasusual.Therewillbenoimpacttonetworkperformanceorbehavior.YesyouwillbeabletoSSH/telnet/consoleintoswitchesandwirelessnetworkinfrastructureasusual.FortheperiodDNACenterisunreachable,Assurancedatawillbelost,andyouwillnotbeabletomakeconfigurationchangestotheCiscoSD-Accessnetwork.
Question9
WhichtwocomponentsaresupportedbyLISP?(Choosetwo)
A.proxyETR
B.HMACalgorithm
C.routereflector
D.egresstunnelrouter
E.spoke
Answer:
AD
Explanation
AnEgressTunnelRouter(ETR)connectsasitetotheLISP-capablepartofacorenetwork(suchastheInternet),publishesEID-to-RLOCmappingsforthesite,respondstoMap-Requestmessages,anddecapsulatesanddeliversLISP-encapsulateduserdatatoendsystemsatthesite.
ALISPproxyETR(PETR)implementsETRfunctionsonbehalfofnon-LISPsites.APETRistypicallyusedwhenaLISPsiteneedstosendtraffictonon-LISPsitesbuttheLISPsiteisconnectedthroughaserviceproviderthatdoesnotacceptnonroutableEIDsaspacketsources.PETRsactjustlikeETRsbutforEIDsthatsendtraffictodestinationsatnon-LISPsites.
Question10
Draganddropthevirtualcomponentfromtheleftontotheirdescriptionsontheright.
Answer:
+configurationfilecontainingsettingsforavirtualmachinesuchasguestOS:VMX
+componentofavirtualmachineresponsibleforsendingpacketstothehypervisor:vNIC
+zipfilecontainingavirtualmachineconfigurationfileandavirtualdisk:OVA
+filecontainingavirtualmachinediskdrive:VMDK
Explanation
TheVMXfilesimplyholdsthevirtualmachineconfiguration.
VMDK(shortforVirtualMachineDisk)isafileformatthatdescribescontainersforvirtualharddiskdrivestobeusedinvirtualmachineslikeVMwareWorkstationorVirtualBox.
AnOVAfileisanOpenVirtualizationAppliancethatcontainsacompressed,“installable”versionofavirtualmachine.WhenyouopenanOVAfileitextractstheVMandimportsitintowhatevervirtualizationsoftwareyouhaveinstalledonyourcomputer.
Question11
HowdoesEIGRPdifferfromOSPF?
A.EIGRPismorepronetoroutingloopsthanOSPF
B.EIGRPsupportsequalorunequalpathcost,andOSPFsupportsonlyequalpathcost.
C.EIGRPhasafullmapofthetopology,andOSPFonlyknowsdirectlyconnectedneighbors
D.EIGRPusesmoreCPUandmemorythanOSPF
Answer:
B
Explanation
BothEIGRPandOSPFisnotsusceptibletoroutingloopsandEIGRPisnotmorepronetoroutingloopsthanOSPF->AnswerAisnotcorrect.
BothEIGRPandOSPFhasafullmapofthetopology->AnswerCisnotcorrect.
OSPFmaintainsinformationaboutallthenetworksandrunningroutersinitsarea.Eachtimethereisachangewithinthearea,allroutersneedtore-synctheirdatabaseandthenrunSPFagain.ThisprocessmakesitmoreCPUintensive.EIGRP,ontheotherhand,hastriggeredandincrementalupdates.ThereforeEIGRPismoreefficientintermsofCPUusageandmemory.
Question12
Refertotheexhibit.
Whatdoestheoutputconfirmabouttheswitch’sspanningtreeconfiguration?
A.Thespanning-treemodestpieeecommandwasenteredonthisswitch
B.Thespanning-treeoperationmodeforthisswitchisPVST
C.Thespanning-treeoperationmodeforthisswitchisIEEE
D.Thespanning-treeoperationmodeforthisswitchisPVST+
Answer:
D
Explanation
Thedefaultspanning-treemodeinCiscoswitchisPVST+.Thisspanning-treemodeisbasedontheIEEE802.1DstandardandCiscoproprietaryextensions.PVST+issameasstandardIEEE802.1DbutitrunsoneachVLAN.Intheoutputweseetheline“Spanningtreeenabledprotocolieee”under“VLAN20”soitcansaytheswitchisrunninginPVST+mode.
Question13
AcustomerhasrecentlyimplementedanewwirelessinfrastructureusingWLC-5520SatasitedirectlynexttoalargecommercialairportUsersreportthattheyintermittentlyloseWi-Ficonnectivity,andtroubleshootingrevealsitisduetofrequentchannelchanges.Whichtwoactionsfixthisissue?(Choosetwo)
A.RemoveUNII-2andExtendedUNII-2channelsfromthe5GHzchannellist
B.RestoretheDCAdefaultsettingsbecausethisautomaticallyavoidschannelinterference
C.DisableDFSchannelstopreventinterferencewithDopplerradar
D.EnableDFSchannelsbecausetheyareimmunetoradarinterference
E.ConfigurechannelsontheUNII-2andtheExtendedUNII-2sub-bandsofthe5GHzbandonly
Answer:
AC
Explanation
Inthe5GHzspectrumsomeofthechannelsusedby802.11aresubjecttoDynamicFrequencySelection(DFS)requirements.ThisisduetoourclientscoexistencewithotherRFtechnologiessuchasMaritime,AviationandWeatherRADAR.
DynamicFrequencySelection(DFS)istheprocessofdetectingradarsignalsthatmustbeprotectedagainstinterferencefrom5.0GHz(802.11a/h)radios,andupondetectionswitchingtheoperatingfrequencyofthe5.0GHz(802.11a/h)radiotoonethatisnotinterferingwiththeradarsystems.
Reference:
/en/US/docs/routers/access/wireless/software/guide/RadioChannelDFS.pdf
AlthoughDFShelpsreduceinterferencewithradarsystemsbut“DFSchannels”refertothe5GHzchannelsthatrequireDFScheck.Inotherwords,DFSchannelsarechannelsthatmayinterferewithradarsignal.ThereforeweshoulddisabletheseDFSchannels->AnswerCiscorrect.
UNII-2(5.250-5.350GHzand5.470-5.725GHz)whichcontainschannels52,56,60,64,100,104,108,112,116,120,124,128,132,136,and140arepermittedintheUnitedStates,butsharedwithradarsystems.Therefore,APsoperatingonUNII-2channelsarerequiredtouseDynamicFrequencySelection(DFS)toavoidinterferingwithradarsignals.IfanAPdetectsaradarsignal,itmustimmediatelystopusingthatchannelandrandomlypickanewchannel.
Reference:
/MR/WiFi_Basics_and_Best_Practices/Channel_Planning_Best_Practices
->ThereforeweshouldremoveUNII-2channelsfrom5GHzchannellist.
Question14
Whatisacharacteristicofpara-virtualization?
A.Para-virtualizationguestserversareunawareofoneanother
B.Para-virtualizationallowsdirectaccessbetweentheguestOSandthehypervisor
C.Para-virtualizationlackssupportforcontainers
D.Para-virtualizationallowsthehosthardwaretobedirectlyaccessed
Answer:
C
Explanation
Paravirtualizationworksdifferentlyfromthefullvirtualization.Itdoesn’tneedtosimulatethehardwareforthevirtualmachines.Thehypervisorisinstalledonaphysicalserver(host)andaguestOSisinstalledintotheenvironment.Virtualguestsawarethatithasbeenvirtualized,unlikethefullvirtualization(wheretheguestdoesn’tknowthatithasbeenvirtualized)totakeadvantageofthefunctions.
Infullvirtualization,guestswillissueahardwarecallsbutinparavirtualization,guestswilldirectlycommunicatewiththehost(hypervisor)usingdrivers.
Question15
DraganddropthecharacteristicsfromtheleftontotheQoScomponentstheydescribeontheright.
Answer:
+marking:appliedontraffictoconveyinformationtoadownstreamdevice
+shaping:processusedtobuffertrafficthatexceedsapredefinedrate
+classification:distinguishestraffictypes
+trust:permitstraffictopassthroughthedevicewhileretainingDSCP/COSvalue
Question16
Acustomerrequestsanetworkdesignthatsupportstheserequirements:
*FHRPredundancy
*multivendorrouterenvironment
*IPv4andIPv6hosts
Whichprotocoldoesthedesigninclude?
A.GLBP
B.VRRPversion2
C.VRRPversion3
D.HSRPversion2
Answer:
C
Explanation
UnlikeHSRPorGLBP,VRPPisanopenstandard.OnlyVRRPv3supportsbothIPv4andIPv6.
Question17
Refertotheexhibit.
vlan222
remote-span
!
vlan223
remote-span
!
monitorsession1sourceinterfaceFastEthernet0/1tx
monitorsession1sourceinterfaceFastEthernet0/2rx
monitorsession1sourceinterfaceport-channel5
monitorsession1destinationremotevlan222
WhathappenstoaccessinterfaceswhereVLAN222isassigned?
A.Theyareplacedintoaninactivestate
B.Adescription“RSPAN”isadded
C.STPBPDUguardisenabled
D.TheycannotprovidePoE
Answer:
A
Explanation
Accessports(includingvoiceVLANports)ontheRSPANVLANareputintheinactivestate.
Reference:
/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750xscg/swspan.html
Question18
WhichsolutiondoIaaSserviceprovidersusetoextendaLayer2segmentacrossaLayer3network?
A.VXLAN
B.VTEP
C.VLAN
D.VRF
Answer:
A
Question19
WhatisacharacteristicofMACsec?
A.802.1AEprovidesencryptionandauthenticationservices
B.802.1AEisbuiltbetweenthehostandswitchusingtheMKAprotocol,whichnegotiatesencryptionkeysbasedonthemastersessionkeyfromasuccessful802.1Xsession
C.802.1AEisbuiltbetweenthehostandswitchusingtheMKAprotocolusingkeysgeneratedviatheDiffie-Hellmanalgorithm(anonymousencryptionmode)
D.802.1AEisnegotiatedusingCiscoAnyConnectNAMandtheSAPprotocol
Answer:
A
Explanation
MACsec,definedin802.1AE,providesMAC-layerencryptionoverwirednetwor
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