2021思科認(rèn)證每日一練9輯

2021思科認(rèn)證每日ー練9輯第1輯你使用命令copyrunning-configstartup-config保存路由器的配置,并重啟路由器,但路由器啟動(dòng)后沒有任何運(yùn)行配置。請(qǐng)問可能出現(xiàn)了什么問題?（）A.啟動(dòng)路由器時(shí)使用的命令不對(duì)B.NVRAM受損C.配置寄存器的設(shè)置不正確D.新升級(jí)到的I0S與路由器硬件不兼容E,保存的配置與硬件不兼容答案:。CHAP驗(yàn)證時(shí),將對(duì)方的主機(jī)名HOST作為自己的用戶名USER.此題為判斷題（對(duì),錯(cuò)）。正確答案:V擴(kuò)展IP訪問權(quán)限表的表號(hào)范圍是:（）A.1—100B.1-99C.100-199D.800-899正確答案:CWhichofthefollowingcanleadtothecontributionofLANtrafficcongestion?(Selectallthatapply)ToomanyhostsinabroadcastdomainFullduplexoperationBroadcaststormsMulticastingSegmentationLowbandwidth正確答案:ACFA,C,F解析:Explanation:ChoiceAiscorrectbecausethemorehostsonabroadcastdomain,themoretrafficthatiscreated.ChoiceCcontributestocongestionbecausebroadcaststormscanbecomeveryproblematic,andleadtocompletenetworksaturation.MulticastsaresimilartobroadcastsintheiruseonaLAN.Finally,ifthereisnotenoughbandwidth,trafficsessionscantimeout.Thisleadstonewtransmissionsandthere-sendingofdata,whichcanleadtomorecongestion.IncorrectAnswers:B,E.Theseareincorrectbecausefullduplexoperationandsegmentednetworksactuallyresultinlesscongestion.D.Multicastingcanactuallyalleviatecongestionissues,assinglestreamsofinformationcanreachmultiplehostsatthesametime,insteadofusingaseriesofpointtopointconnections.OSPF在同一區(qū)域內(nèi),下列說法正確的是（）A.每臺(tái)路由器生成的LSA都是相同的B.每臺(tái)路由器的LSDB（鏈路狀態(tài)數(shù)據(jù)庫）都是相同的C.每臺(tái)路由器根據(jù)該LSDB計(jì)算出的最短路徑樹都是相同的D,每臺(tái)路由器根據(jù)該最短路徑樹計(jì)算出的路由都是相同的正確答案:BEzonexamneedstoensuretheirIPnetworkcanbereachedfromtheInternet.WhichofthefollowinghostaddressesaremembersofnetworksthatcanberoutedacrossthepublicInternet?（Choosethree.）525952E.5F.54正確答案:CEFC,E,F解析:Explanation:InInternetterminology,aprivatenetworkisanetworkthatusesRFC1918IPaddressspace.Computersmaybeallocatedaddressesfromthisaddressspacewhenit'snecessaryforthemtocommunicatewithothercomputingdevicesonaninternal(non-Internet)networkbutnotdirectlywiththeInternet.ThreeblocksofIPaddressesarereservedforprivateuseandarenotroutedovertheInternet.CompaniescanassigntheseaddressestonodesontheirprivateLANsatanytimewithoutconflict.TheEzonexamcorporateLANconsistsofonelargeflatnetwork.YoudecidetosegmentthisLANintotwoseparatenetworkswitharouter.Whatwillbetheaffectofthischange?A.Thenumberofbroadcastdomainswillbedecreased.B.Itwillmakethebroadcastingoftrafficbetweendomainsmoreefficientbetweensegments.C.Itwillincreasethenumberofcollisions.D.Itwillpreventsegmentl'sbroadcastsfromgettingtosegment2.E.Itwillconnectsegmentl'sbroadcaststosegment2.正確答案:D解析:ExplanationArouterdoesnotforwardbroadcasttraffic.Itthereforebreaksupabroadcastdomain,reducingunnecessarynetworktraffic.BroadcastsfromonesegmentwillnotbeseenontheothersegmentIncorrectAnswers:Thiswillactuallyincreasethenumberofbroadcastdomainsfromonetotwo.Alllinkleveltrafficfromsegmentonetosegmenttwowillnowneedtoberoutedbetweenthetwointerfacesoftherouter.AlthoughthiswillreducethetrafficontheLANlinks,itdoesalsoprovidealessefficienttransportbetweenthesegments.Sincethenetworksizeiseffectivelycutintohalf,thenumberofcollisionsshoulddecreasedramatically.E.Broadcastsfromonesegmentwillbecompletelyhiddenfromtheothersegment.配置LACP時(shí),在要使用的接口上必須將哪三個(gè)參數(shù)配置得完全相同?()A,虛擬MAC地址B,端口速度c.雙エ模式D.PortFastE.VLAN信息答案:BCE2021思科認(rèn)證每日ー練9輯第2輯當(dāng)配置一個(gè)CISCO的路由器時(shí),缺省的DR和BDR優(yōu)先級(jí)是（）。A.OB.lC.16D.255正確答案:B網(wǎng)絡(luò)中經(jīng)常使用“幀中繼”服務(wù),請(qǐng)選岀幀中繼的優(yōu)點(diǎn)（）A.偷占帶寬B提供擁塞管理機(jī)制C.可以使用任意廣域網(wǎng)協(xié)議D.靈活的接入方式正確答案:ABDTheEzonexamnetworkadministratorhasissuedthe"VTPpasswordezonexam"commandonaCiscodevice.Whatisthepurposeofthiscommand?A.ItallowstwoVTPserverstoexistsinthesamedomain,eachconfiguredwithdifferentpasswordsB.ItisthepasswordrequiredwhenpromotingaswitchfromVTPclientmodetoVTPservermodeC.ItisusedtoaccesstheVTPservertomakechangestotheVTPconfigurationD.ItisusedtovalidatethesourcesofVTPadvertisementssentbetweenswitchesE.Noneoftheabove正確答案:DFromwheredoesasmallnetworktypicallygetitsIPnetworkaddressesorIPblock?A.FromtheInternetDomainNameRegistry(IDNR)B.FromtheInternetAssignedNumbersAuthority(IANA)C.FromtheInternetServiceProvider(ISP)D.FromtheInternetArchitectureBoard(IAB)E.Noneoftheabove正確答案:C解析:Explanation:NormallyasmallnetworkwillbeassignedanumberofIPaddressesfromtheirISP,orinsomecases,suchasDSLandcablemodem,asingledynamicIPaddresswillbeassignedbytheISP.OnlyverylargenetworksrequiringalargeIPblock(normallymorethana/20)willregisterwithIANA,RIPE,orARIN(AmericanRegistryofInternetNumbers)toobtaintheirIPaddresses.Afterworkingonarouter,someproblemsariseandyouwishtoviewthecommandsthatyourecentlyentered.WhichIOScommandopensthehistorybufferanddisplaysthemostrecentlyenteredcommands?ShowhistoryShowbuffersShowtypedcommandsShowterminalbufferShowcommandNoneoftheabove正確答案:AA解析:Explanation:Therouterwillbufferpreviouslyenteredcommands.Bydefault,the"showhistory"commandwilldisplaytheprevioustencommandsthatwereentered.Toseethecontentsofthebufferyouentertheshowhistorycommand.IncorrectAnswers:ThiscommandwillshowthememorybufferinformationD.Theseareinvalidcommands.WhichofthefollowingaretrueofEthernettechnology?A.Hostsusealogicalringtopology.B.HostsusealogicalbustopologyC?Hostsmustwaitforanelectronicsignaltotransferdata.D.HostsaredirectlyconnectedtoawiringconcentratorcalledaMSAU.E.Noneoftheabove正確答案:B解析:Explanation:LANtopologiesdefinethemannerinwhichnetworkdevicesareorganized.FourcommonLANtopologiesexist:bus,ring,star,andtree.Thesetopologiesarelogicalarchitectures,buttheactualdevicesneednotbephysicallyorganizedintheseconfigurations.Logicalbusandringtopologies,forexample,arecommonlyorganizedphysicallyasastar.AbustopologyisalinearLANarchitectureinwhichtransmissionsfromnetworkstationspropagatethelengthofthemediumandarereceivedbyallotherstations.OfthethreemostwidelyusedLANimplementations,Ethernet/IEEE802.3networks,includingl00BaseT,implementabustopology,whichisillustratedinFigure2-3.Somenetworksimplementalocalbustopology.下列哪項(xiàng)OSI第2層功能是由PPP協(xié)議標(biāo)準(zhǔn)規(guī)范,但使用CISCO專有的HDLC報(bào)頭字段實(shí)現(xiàn)A.成幀B.尋址C錯(cuò)謝僉測(cè)D.識(shí)別幀內(nèi)的協(xié)議類型正確答案:DOSPF骨干區(qū)域存在（）類LSA0Al類B二類D.四類E五類F.七類正確答案:ABCDE2021思科認(rèn)證每日ー練9輯第3輯Whichoftheprotocolsbelow,operatesatLayer2oftheOSImodel,andisusedtomaintainaloop-freenetwork?A.RIPB.STPIGRPCDPVTPNoneoftheabove正確答案:BB解析:Explanation:STP(spanningtreeprotocol)operatesonlayer2topreventloopsinswitchesandbridges.IncorrectAnswers:AzC.RIPandIGRPareroutingprotocols,whichareusedatlayer3tomaintainaloopfreeroutedenvironment.CDPdoesindeedoperateatlayer2,butitdoestnotprovideforaloopfreetopology.CDPisusedbyCiscodevicestodiscoverinformationabouttheirneighbors.VTPistheVLANTrunkingProtocol,usedtopassVLANinformationthroughswitches.ItreliesontheSTPmechanismtoprovidealoopfreenetwork.WhataresomeofthecharacteristicsofatypicalVLANarrangement,foundthroughouttheEzonexamswitchedLAN?(Selectallthatapply)VLANslogicallydivideaswitchintomultiple,independentswitchesatLayer2.TrunklinkscancarrytrafficformultipleVLANs.VLANimplementationsignificantlyincreasestrafficduetoaddedtrunkinginformation.AVLANcanspanmultipleswitches.VLANstypicallyincreasethenumberofswitchesneededVLANstypicallydecreasethenumberofswitchesneeded正確答案:ABDA,B,D解析:Explanation:VLANsgiveyouthepowerofmakingvirtualLANnetworkstosubdividecollisiondomainsintosmallerunitsoffunctionality,withoutbeinglimitedbyphysicallocation.AiscorrectbecausethatistheexactfunctionofaVLAN.BiscorrectbecausetrunklinksareusedtocarrytrafficformultipleVLANs.DiscorrectbecauseaVLANcanandoftendoesspanacrossmultipleswitches.VTPmakesthispossible.IncorrectAnswers:C.Althoughtrunkinginformationdoesindeedaddsomelevelofoverhead,theoveralltrafficoverheadisgreatlyreducedthoughtheuseofVLANs.E,F.ThenumberoftotalswitchesneededinanetworkistheresultofthenumberofdevicesontheentireLANthatneedtobeconnected.WhetherVLANsareusedornotwillhavelittle,ifany,impactonthetotalnumberofswitchesneededinaLAN.Whichthreestatementsaretrueabouttheoperationofafull-duplexEthernetnetwork,whichisbeingusedintheEzonexamLAN?(Choosethree)A.Ethernethubportsarepreconfiguredforfull-duplexmode.B.Thehostnetworkcardandtheswitchportmustbecapableofoperatinginfull-duplexmode.C.Therearenocollisionsinfull-duplexmode.D.Inafull-duplexenvironment,thehostnetworkcardmustcheckfortheavailabilityofthenetworkmediabeforetransmitting.E.Adedicatedswitchportisrequiredforeachfull-duplexnode.正確答案:BCE解析:Explanation:Half-duplexEthernetisdefinedintheoriginal802.3EthernetandCiscosaysyouonlyuseonewirepairwithadigitalsignalrunninginbothdirectionsonthewire.ItalsousestheCSMA/CDprotocoltohelppreventcollisionsandtopermitretransmittingifacollisiondoesoccur.Ifahubisattachedtoaswitch,itmustoperateinhalf-duplexmodebecausetheendstationsmustbeabletodetectcollisions.Half-duplexEthernet-typicallylOBaseT-isonlyabout30to40percentefficientasCiscoseesit,becausealargelOBaseTnetworkwillusuallyonlygiveyou3-to4Mbps-atmost.Full-duplexEthernetusestwopairsofwires,insteadofonewirepairlikehalfduplex.Also,fullduplexusesapoint-to-pointconnectionbetweenthetransmitterofthetransmittingdeviceandthereceiverofthereceivingdevice,whichmeansthatwithfull-duplexdatatransfer,yougetafasterdatatransfercomparedtohalfduplex.Andbecausethetransmitteddataissentonadifferentsetofwiresthanthereceiveddata,nocollisionsoccur.Thereasonyoudon'tneedtoworryaboutcollisionsisbecausenowFull-duplexEthernetislikeafreewaywithmultiplelanesinsteadofthesingle-laneroadprovidedbyhalfduplex.Full-duplexEthernetissupposedtooffer100percentefficiencyinbothdirections;thismeansyoucanget20Mbpswitha10MbpsEthernetrunningfullduplex,or200MbpsforFastEthernet,在地址轉(zhuǎn)換中,（）用來規(guī)定哪些數(shù)據(jù)包需要進(jìn)行地址轉(zhuǎn)換A.在線用戶表B.訪問控制列表C.MAC地址表D.路由表正確答案:B以下哪個(gè)命令讓路由器在show之后顯示有效的參數(shù)列表A.sh?B.show?C.show?D.showhelp正確答案:C請(qǐng)參見圖示圖中的所有網(wǎng)絡(luò)都帶有/24前綴假設(shè)網(wǎng)絡(luò)中的所有路由器均已獲知所有路由,哪個(gè)地址最適合總結(jié)圖中的網(wǎng)絡(luò)〇A./21B./24C./24D./21正確答案:DSplithorizonhasbeenenabledwithintheEzonexamroutednetwork.Whichoneofthefollowingstatementsbestexplainsthesplithorizonrule?A.Onlyrouterscansplitboundaries(horizons)betweennetworksinseparateASnumbers.B.EachASmustkeeproutingtablesconvergedtopreventdeadroutesfrombeingadvertisedacrossboundaries.C.Oncearouteisreceivedonaninterface,advertisethatrouteasunreachablebackoutthesameinterface.D.Informationaboutarouteshouldneverbesentbackinthedirectionfromwhichtheoriginalupdatecame.E.Noneoftheabove正確答案:D解析:Explanation:Thesplithorizonrulestates:*Neveradvertisearouteoutoftheinterfacethroughwhichyoulearnedit.Forinstance,inFigure4abelow,ifRouterOneisconnectedtoRoutersTwoandThreethroughasinglemultipointinterface(suchasFrame.Relay),andRouterOnelearnedaboutNetworkAfromRouterTwo,itwillnotadvertisetheroutetoNetworkAbackoutthesameinterfacetoRouterThree.RouteroneassumesthatRouterThreewouldlearnaboutNetworkAdirectlyfromRouterTwo.IncorrectAnswers:ThereisnosuchrequirementDistancevectorprotocolsupdatesroutingtableatregularintervalsinsteadofTopologychangesThisisthedefinitionofthepoisonreverserule,notthesplithorizonrule.以下情況可以使用訪問控制列表,描述準(zhǔn)確的是（）。A,禁止有CIH病毒的文件到我的主機(jī)B.禁止黑客訪問我的主機(jī)C.可以禁止所有使用Telnet的用戶訪問我的主機(jī)D.禁止使用UNIX系統(tǒng)的用戶訪問我的主機(jī)正確答案:ABD2021思科認(rèn)證每日ー練9輯第4輯EzonexamisusingIPaddressingaccordingtoRFC1918.WhichthreeaddressrangesareusedforinternalprivateaddressblocksasdefinedbyRFC1918?(Chooseallthatapply)to255.255.255to55to55D.to55E..to55to55to55正確答案:BDFB,D,F解析:Explanation:RFC1918definesthreedifferentIPaddressrangesasprivate,meaningthattheycanbeusedbyanyprivatenetworkforinternaluse,andtheserangesarenottobeusedintheInternet.TheclassAprivaterangeisto55.TheclassBaddressrangeisto55.TheclassCprivateIPaddressrangeisto55.IncorrectAnswers:A.Thenetworkaddressisinvalidandcannotbeused.C.Thecorrectaddressrangeis172.16.X.Xthrough172.31.X.XE.TheaddressisreservedfortheinternalloopbackIPaddress,buttheentire127.X.X.XrangeisnotdefinedinRFC1918asaprivateaddressrangefornetworks.G.ThisaddressrangedescribestheclassDmulticastaddressrange.已知某臺(tái)路由器的路由表中有如下兩個(gè)表項(xiàng)假如該路由器要轉(zhuǎn)發(fā)目的地址為的報(bào)文,則下列說法中正確的是()A.選擇第一項(xiàng),因?yàn)镺SPF協(xié)議的優(yōu)先級(jí)高B.選擇第二項(xiàng),因?yàn)镽IP協(xié)議的花費(fèi)值(Metric)小C.選擇第二項(xiàng),因?yàn)槌隹谑荅thternetO,比SerialO速度快D.選擇第二項(xiàng),因?yàn)樵撀酚身?xiàng)對(duì)于目的地址9.145來說,是更精確的匹配正確答案:D對(duì)于IP為,子網(wǎng)掩碼為40,則該IP地址和子網(wǎng)掩碼相作用會(huì)得到ー系列IP,從下列選項(xiàng)中選出屬于“有效IP"的選項(xiàng):0A.3B.12C.19D.26E.75F.08正確答案:ABCDFTP工作在OSI哪ー層（）舌層B.表ホ層C.傳輸層D.應(yīng)用層正確答案:DIGP包括如下哪些協(xié)議()A.RIPB.BGPC.IS-ISD.OSPF正確答案:ACDYoudownloadafilefromanFTPsiteontheInternet.WhatisthehighestlayerintheOSImodelusedinthisFTPoperation?ApplicationPresentationSessionTransportE.InternetDataLinkPhysical正確答案:AA解析:Explanation:Layer7istheapplicationlayer,whichisthehighestlayerintheOSImodel.Thislayerdescribestheuseofenduserapplications,suchasopeningmoviefiles(avi,mpeg,etc)usedMicrosoftOfficeapplications,usingWWWbrowsers,usingTelnet,andusingFTP.Thenetworkwassubnettedusinga/28subnetmask.Howmanyusablesubnetsandhostaddressespersubnetwerecreatedasaresultofthis?2networkswith62hosts6networkswith30hosts16networksand16hosts62networksand2hosts14networksand14hostsNoneoftheabove正確答案:FF解析：Explanation:AclassCsubnetwitha28bitmaskrequires4bitsforthenetworkaddress,leaving4bitsforhostaddresses.Usingthe2n-2formula(24-2inthiscase)wehave14hostaddressesand16networkaddresses.IncorrectAnswers:Thiswouldbetheresultofa/26networkmaskThiswouldbetheresultofa/27networkmaskRememberweneedtoalwayssubtracttwoforthenetworkandbroadcastaddresses,sothisanswerisincorrect.Thiswouldbetheresultofa/30networkmask.網(wǎng)絡(luò)管理員輸入routerospf100命令,命令中數(shù)字100的作用是（）A啟治系統(tǒng)編號(hào)B.度量值C進(jìn)程IDD.管理距離正確答案:C2021思科認(rèn)證每日ー練9輯第5輯OSPF協(xié)議中,ABR的不同端口可能運(yùn)行在不同的area中,其中一定有接口運(yùn)行在（）當(dāng)中.A.areaOB.arealC.arealOD.arealOO正確答案:A以下哪ー項(xiàng)不是有關(guān)虛電路交換方式的正確描述。（）A.分組需要包含虛電路標(biāo)識(shí)符B.某條虛電路對(duì)應(yīng)的轉(zhuǎn)發(fā)項(xiàng)只給出該虛電路經(jīng)過的兩個(gè)端口之間的關(guān)聯(lián)C.虛電路標(biāo)識(shí)符用于建立終端間傳輸路徑與終端間傳輸?shù)臄?shù)據(jù)之間的綁定D.虛電路是指終端間傳輸路徑參考答案:AOSPF在建立鄰接關(guān)系的過程中使用了哪幾類報(bào)文（）A.HELLO報(bào)文B.DBD（數(shù)據(jù)庫描述）報(bào)文C.LSR（鏈路狀態(tài)請(qǐng)求）報(bào)文D.LSU（鏈路狀態(tài)更新）報(bào)文正確答案:ABCD在廣域網(wǎng)結(jié)構(gòu)中使用什么連接DTE和DCE設(shè)備()。A.本地環(huán)路B扌妾口線纜C.路由器D.交換機(jī)正確答案:B下面有關(guān)交換機(jī)的描述中,正確的是()A.所有交換機(jī)都支持VLAN功能B.交換機(jī)端口數(shù)量最多為48ロC.交換機(jī)獨(dú)占帶寬D.交換機(jī)端口的最大速率為!00Mbit/s正確答案:C對(duì)于以下ACL語句描述正確的是()RI(config)#ipaccess-liststandardTELNETRI(config-std-nacDSpermitRI(config)#lineyty04RI(config-1ine)#access-classTELNETinA.只允許的數(shù)據(jù)流穿過R1B.只允許對(duì)R1進(jìn)行TELNETC.只允許對(duì)R1逬行TELNET并拒絕其它流量D.只允許/24網(wǎng)段的數(shù)據(jù)流穿過R1正確答案:BThenetworkadministratorhasconfiguredportsecurityonaEzonexamswitch.WhywouldanetworkadministratorconfigureportsecurityonthisEzonexamdevice?A.TopreventunauthorizedhostsfromgettingaccesstotheLANB.「〇limitthenumberofLayer2broadcastsonaparticularswitchportC.Topreventunauthorized'FelnetorSSHaccesstoaswitchportD.TopreventtheIPandMACaddressoftheswitchandassociatedportsE.Noneoftheabove正確答案:A解析:Explanation:YoucanusetheportsecurityfeaturetorestrictinputtoaninterfacebylimitingandidentifyingMACaddressesofthestationsallowedtoaccesstheport.WhenyouassignsecureMACaddressestoasecureport,theportdoesnotforwardpacketswithsourceaddressesoutsidethegroupofdefinedaddresses.IfyoulimitthenumberofsecureMACaddressestooneandassignasinglesecureMACaddress,theworkstationattachedtothatportisassuredthefullbandwidthoftheport.IfaportisconfiguredasasecureportandthemaximumnumberofsecureMACaddressesisreached,whentheMACaddressofastationattemptingtoaccesstheportisdifferentfromanyoftheidentifiedsecureMACaddresses,asecurityviolationoccurs.Also,ifastationwithasecureMACaddressconfiguredorlearnedononesecureportattemptstoaccessanothersecureport,aviolationisflagged.AftermakingsomenetworkchangesyoupoweroffandthenpoweronyourCiscorouternamedVE1.WhatsequenceofeventsoccurswhenVE1ispoweredup?Perform.POST,locateconfigurationstatements,applyconfigurationstatements,locateCiscoIOSsoftware,andloadCiscoIOSsoftware.LocateCiscoIOSsoftware,loadCiscoIOSsoftware,locateconfigurationstatements,applyconfigurationstatements,andperform.POST.C.'Testsoftwareroutines,POST,loadconfigurationfiles,loadCiscoIOSsoftware,testCiscoIOSsoftware.Perrform.POST,locateCiscoIOSsoftware,loadtheCiscoIOSsoftware,locateconfigurationstatements,andapplyconfigurationstatements.LoadandtestIOS,loadconfigurationfiles,testsoftwareroutines,POST.Noneoftheabove正確答案:DD解析:Explanation:Uponinitialstartup,Ciscoroutersperform.thefollowingstepsinorder:Therouterperformsapower-onself-test(POST)todiscoverandverifythehardware.TherouterloadsandrunsbootstrapcodefromROM.TherouterfindstheIOSorothersoftwareandloadsit.Therouterfindstheconfigurationfileandloadsitintorunningconfig.2021思科認(rèn)證每日ー練9輯第6輯WhichofthefollowingareVLANframe,encapsulationtypesthatmaybeconfiguredonaCatalystswitch?(Choosetwo.)VTPISLCDP802.1Q802.1pLLC正確答案:BDB,D解析:Explanation:ThetwoVLANtrunkingencapsulationtypesare:Inter-SwitchLink(ISL):ThisisproprietarytoCiscoswitches,andit'susedforFastEthernetandGigabitEthernetlinksonly.ISLroutingcanbeusedonaswitchport,routerinterfaces,andserverinterfacecardstotrunkaserver.ISLletsyouexplicitlytagVLANinformationontoanEthernetframe.ThistagginginformationallowsVLANstobemultiplexedoveratrunklinkthroughanexternalencapsulationmethod,whichallowstheswitchtoidentifytheVLANmembershipofaframe,overthetrunkedlink.IEEE802.IQ:CreatedbytheIEEEasastandardmethodofframe,tagging,thisactuallyinsertsafieldintotheframe,toidentifytheVLAN.Ifyou'retrunkingbetweenaCiscoswitchedlinkandadifferentbrandofswitch,youhavetouse802.IQforthetrunktowork.下面哪條命令是正確的,如果要將/24的業(yè)務(wù)網(wǎng)段發(fā)到OSPF的areaO()A.Router(config-router)network550B.Router(config-router)network55areaOC.Router(config-router)network55areaOD.Router(config-router)networkareaO正確答案:B要在連接到服務(wù)器的端口上禁用STP,可使用下面哪個(gè)命令?()A.disablespanning-treeB.spanning-treeoffC.spanning-treesecurityD.spanning-treeportfast答案:DOSPF的度量值是什么()A.跳數(shù)Bオ妾口開銷C.矢量距離D.鏈路狀態(tài)正確答案:D關(guān)于RIP協(xié)議,下列說法正確的有()A.RIP協(xié)議是ー種IGPB.RIP協(xié)議是ー種EGPC.RIP協(xié)議是ー種距離矢量路由協(xié)議D.RIP協(xié)議是ー種鏈路狀態(tài)路由協(xié)議正確答案:AC請(qǐng)參見下圖。哪個(gè)地址是內(nèi)部全局地址()A.B.C.5D.正確答案:CTheEzonexamnetworkadministratorneedstoaswitchnamedVE1tobecometherootbridgeforaredundantpathswitchednetwork.WhatcanbedonetoensurethatVE1willalwaysassumetheroleastherootbridge?A.AssigntheswitchahigherMACaddressthantheotherswitchesinthenetworkhaveB.EstablishadirectlinkfromtheswitchtoallotherswitchesinthenetworkC.Configuretheswitchfull-duplexoperationandconfiguretheotherswitchesforhalf-duplexoperationD.ConfiguretheswitchsothatithaslowerprioritythanotherswitchesinthenetworkE.Noneoftheabove正確答案:D路由器下"特權(quán)用戶模式”的標(biāo)識(shí)符是:（）A.>B.1C.D.（config-if）正確答案:C2021思科認(rèn)證每日ー練9輯第7輯在路由器中,如果去往同一目的地有多條路由,則決定最佳路由的因素有（）A.優(yōu)先級(jí)B.發(fā)布者C.metirc值D.生存時(shí)間正確答案:ACOSPF的度量值是什么()A.跳數(shù)B扌妾口開銷C.矢量距離D.鏈路狀態(tài)正確答案:DHowcanaEzonexamadministratordetermineifarouterhasbeenconfiguredwhenitisfirstpoweredup?A.AconfiguredrouterpromptsforapasswordB.AconfiguredroutergoestotheprivilegedmodepromptC.AnunconfiguredroutergoesintothesetupdialogD.Anunconfiguredroutergoestotheenablemodeprompt正確答案:C解析:Explanation:Ifanon-configuredrouterisstarted,thenitgoesintosetupmodeandaskfortheminimumconfigurationparameters(hostname,IPaddresstointerfaces,enablepassword,etc).Iftherouterisalreadyconfigureditbootsbyimplementingthesavedstartup-config.為查看配置注冊(cè)表設(shè)置,你需要輸入哪個(gè)命令()A.showrunning-configB.showstartup-configC.showversionD.showcontrollers正確答案:CTheEzonexamnetworkadministratorwantstoensurethatonlyasinglewebservercanconnecttopotFaO/1onacatalystswitch.Theserverispluggedintotheswitch'sFastEth.0/1portandthenetworkadministratorisabouttobringtheserveronline.WhatcantheadministratordotoensurethatonlytheMACaddressofthisserverisallowedbyswitchportFaO/1?(Choosetwo)A.ConfigureportFaO/1toacceptconnectionsonlyfromthestaticIPaddressoftheserverB.ConfiguretheMACaddressoftheserverasastaticentryassociatedwithportFaO/1C.EmployaproprietaryconnectortypeonFaO/1thatisincomputablewithotherhostconnectorsD?ConfigureportsecurityonFaO/1torejecttrafficwithasourceMACaddressotherthanthatoftheserverE.BindtheIPaddressoftheservertoitsMACaddressontheswitchtopreventotherhostsfromspoofingtheserverIPaddress正確答案:BD解析:Explanation:YoucanuseportsecuritytoblockinputtoanEthernet,FastEthernet,orGigabitEthernetportwhentheMACaddressofthestationattemptingtoaccesstheportisdifferentfromanyoftheMACaddressesspecifiedforthatport.Whenasecureportreceivesapacket,thesourceMACaddressofthepacketiscomparedtothelistofsecuresourceaddressesthatweremanuallyconfiguredorautoconfigured(learned)ontheport.IfaMACaddressofadeviceattachedtotheportdiffersfromthelistofsecureaddresses,theporteithershutsdownpermanently(defaultmode),shutsdownforthetimeyouhavespecified,ordropsincomingpacketsfromtheinsecurehost.Theport'sbehavior,dependsonhowyouconfigureittorespondtoasecurityviolation.Whenasecurityviolationoccurs,theLinkLEDforthatportturnsorange,andalink-downtrapissenttotheSimpleNetworkManagementProtocol(SNMP)manager.AnSNMPtrapisnotsentifyouconfiguretheportforrestrictiveviolationmode.Atrapissentonlyifyouconfiguretheporttoshutdownduringasecurityviolation.WhichoneofthefollowingprotocolsallowstheinformationabouttheconfigurationofanewVLANtobedistributedacrossentireswitchednetwork?STPVTPEIGRPSNMPCDPNoneoftheabove正確答案:BB解析:Explanation:SybexCCNAStudyGuide4thEditionstatesonpage359:"ThebasicgoalsofVLANTrunkingProtocol(VTP)aretomanageallconfiguredVLANsacrossaswitchedinternetworkandtomaintainconsistencythroughoutthatnetwork.VTPallowsanadministratortoadd