CCNA（200-120）題庫(kù)中英對(duì)照

CCNA（200-120）題庫(kù)中英對(duì)照QUESTION001Refertotheexhibit.WhatwillRouter1dowhenitreceivesthedataframeshown?(Choosethree.)參照下圖，這個(gè)圖示顯示了Ｒ１接受到如圖所示數(shù)據(jù)幀的時(shí)候會(huì)怎么做？Router1willstripoffthesourceMACaddressandreplaceitwiththeMACaddress0000.0c36.6965.Ｒ１會(huì)剝離源ＭＡＣ地址，以0000：0C36.6965代替。Router1willstripoffthesourceIPaddressandreplaceitwiththeIPaddress.Ｒ１會(huì)剝離源IP地址，以代替。Router1willstripoffthedestinationMACaddressandreplaceitwiththeMACaddress0000.0c07.4320.Ｒ１會(huì)剝離源ＭＡＣ地址，以0000：0C36.6965代替。D.Router1willstripoffthedestinationIPaddressandreplaceitwiththeIPaddressof.Ｒ１會(huì)剝離目的IP地址，以代替。Router1willforwardthedatapacketoutinterfaceFastEthernet0/1.R1將會(huì)從F0/1轉(zhuǎn)發(fā)這個(gè)數(shù)據(jù)包。Router1willforwardthedatapacketoutinterfaceFastEthernet0/2.R1將會(huì)從F0/2轉(zhuǎn)發(fā)這個(gè)數(shù)據(jù)包數(shù)據(jù)傳輸過(guò)程中，IP地址不變，但是在不同的網(wǎng)段中，MAC地址要根據(jù)設(shè)備的具體情況而發(fā)生改變。在不同網(wǎng)絡(luò)中，依靠IP地址定位，在同一網(wǎng)絡(luò)中，依靠MAC地址定位。QUESTION002Refertotheexhibit.WhichthreestatementscorrectlydescribeNetworkDeviceA?(Choosethree.)如圖所示，關(guān)于網(wǎng)絡(luò)設(shè)備A哪三項(xiàng)是正確的描述？Withanetworkwidemaskof28,eachinterfacedoesnotrequireanIPaddress.如果配置一個(gè)25位的網(wǎng)絡(luò)號(hào)，每個(gè)端口不需要配置一個(gè)地址。Withanetworkwidemaskof28,eachinterfacedoesrequireanIPaddressonauniqueIPsubnet.如果配置一個(gè)25位的網(wǎng)絡(luò)號(hào)，每個(gè)端口需要配置一個(gè)地址和子網(wǎng)。Withanetworkwidemaskof,mustbeaLayer2deviceforthePCstocommunicatewitheachother.如果配置一個(gè)24位的網(wǎng)絡(luò)號(hào)，成為一個(gè)二層設(shè)備以便讓PC和其他設(shè)備通訊。Withanetworkwidemaskof,mustbeaLayer3deviceforthePCstocommunicatewitheachother.如果配置一個(gè)24位的網(wǎng)絡(luò)號(hào)，成為一個(gè)三層設(shè)備以便讓PC和其他設(shè)備通訊。Withanetworkwidemaskof,eachinterfacedoesnotrequireanIPaddress.如果配置一個(gè)23位的網(wǎng)絡(luò)號(hào)，每個(gè)端口不需要配置一個(gè)地址。QUESTION003WhichlayerintheOSIreferencemodelisresponsiblefordeterminingtheavailabilityofthereceivingprogramandcheckingtoseeifenoughresourcesexistforthatcommunication?在OSI參考模型當(dāng)中，哪一層可以判斷程序的可用性以機(jī)是否有足夠的資源來(lái)支持這個(gè)通訊？A.transport傳輸層B.network網(wǎng)絡(luò)層C.presentation表示層D.session會(huì)話層E.application應(yīng)用層QUESTION004WhichofthefollowingdescribestherolesofdevicesinaWAN?(Choosethree.)下列哪些描述廣域網(wǎng)設(shè)備的作用？ACSU/DSUterminatesadigitallocalloop聯(lián)系數(shù)字本地環(huán)路B.AmodemterminatesadigitallocalloopC.ACSU/DSUterminatesananaloglocalloopD.Amodemterminatesananaloglocalloop一個(gè)模擬信號(hào)ArouteriscommonlyconsideredaDTEdevice路由器通常是DTE設(shè)備ArouteriscommonlyconsideredaDCEdevice路由器通常是DCE設(shè)備QUESTION005Refertotheexhibit,HostApingsinterfaceS0/0onrouter3,whatistheTTLvalueforthatping?如圖所示，主機(jī)A的ping路由器3的S0/0接口，TTL值會(huì)是多少？A. 253B. 252C. 255D. 254QUESTION006AnetworkadministratorisverifyingtheconfigurationofanewlyinstalledhostbyestablishinganFTPconnectiontoaremoteserver.Whatisthehighestlayeroftheprotocolstackthattheneworkadministratorisusingforthisoperation?網(wǎng)絡(luò)管理員驗(yàn)證的配置是一個(gè)新安裝的主機(jī)通過(guò)建立FTP連接到遠(yuǎn)程服務(wù)器。網(wǎng)絡(luò)管理員這個(gè)操作使用的最高協(xié)議層是什么？A.applicationB.presentationC.sessionD.transportE.internetF.datalinkFTP協(xié)議屬于應(yīng)用層QUESTION007Refertotheexhibit.AfterHostApingsHostB,whichentrywillbeintheARPcacheofHostAtosupportthistransmission?如圖所示，主機(jī)Ａping主機(jī)B，在此通信中，以下哪個(gè)列表將會(huì)進(jìn)入主機(jī)A的ARP緩存？A.B.C.D.E.F.QUESTION008Anetworkinterfaceporthascollisiondetectionandcarriersensingenabledonasharedtwistedpairnetwork.Fromthisstatement,whatisknownaboutthenetworkinterfaceport?在一個(gè)雙絞線網(wǎng)絡(luò)中的一個(gè)網(wǎng)絡(luò)接口上監(jiān)測(cè)到網(wǎng)絡(luò)沖突，沖這個(gè)表述中，有關(guān)這個(gè)網(wǎng)絡(luò)接口，哪一項(xiàng)是正確的？Thisisa10Mb/sswitchport.Thisisa100Mb/sswitchport.C.ThisisanEthernetportperatingathalfduplex.D.ThisisanEthernetportoperatingatfullduplex.E.ThisisaportonanetworkinterfacecardinaPC.半雙工模式會(huì)產(chǎn)生沖突，全雙工模式不會(huì)產(chǎn)生沖突QUESTION009Areceivinghostcomputesthechecksumonaframeanddeterminesthattheframeisdamaged.Theframeisthendiscarded.AtwhichOSIlayerdidthishappen?收到一個(gè)主機(jī)發(fā)來(lái)的幀并進(jìn)行校驗(yàn)以確認(rèn)是否損壞，然后丟棄。這個(gè)過(guò)程在OSI哪一層發(fā)生？A.sessionB.networkC.PhysicalD.datalinkE.Transport傳輸層：數(shù)據(jù)段，segment網(wǎng)絡(luò)層：數(shù)據(jù)包，數(shù)據(jù)報(bào)，packet數(shù)據(jù)鏈路層：數(shù)據(jù)幀，frameQUESTION010WhichofthefollowingcorrectlydescribestepsintheOSIdataencapsulationprocess?(Choosetwo.)以下那些正確描述了OSI數(shù)據(jù)封裝的過(guò)程？Thetransportlayerdividesadatastreamintosegmentsandmayaddreliabilityandflowcontrolinformation.傳輸層將數(shù)據(jù)分段，并且加上可靠性和流控制信息。ThedatalinklayeraddsphysicalsourceanddestinationaddressesandanFCStothesegment.數(shù)據(jù)鏈路層會(huì)添加物理原和目的地址以及FCS校驗(yàn)字段，然后給數(shù)據(jù)段。Packetsarecreatedwhenthenetworklayerencapsulatesaframewithsourceanddestinationhostaddressesandprotocol-relatedcontrolinformation.當(dāng)網(wǎng)絡(luò)層封裝數(shù)據(jù)幀的時(shí)候，添加源和目的主機(jī)地址已經(jīng)協(xié)議控制信息，形成數(shù)據(jù)包。PacketsarecreatedwhenthenetworklayeraddsLayer3addressesandcontrolinformationtoasegment.網(wǎng)絡(luò)層添加三層地址和控制信息給數(shù)據(jù)段，從而形成數(shù)據(jù)包。Thepresentationlayertranslatesbitsintovoltagesfortransmissionacrossthephysicallink.表示層會(huì)將數(shù)據(jù)轉(zhuǎn)換成電平給物理鏈路傳輸。每一層只能接收來(lái)自上一層的數(shù)據(jù)并進(jìn)行封裝QUESTION011Refertothegraphic.HostAiscommunicatingwiththeseiver.WhatwillbethesourceMACaddressoftheframesreceivedbyHostAfromtheserver?參考以下圖片，主機(jī)A和服務(wù)器之間的通信，主機(jī)A收到服務(wù)器發(fā)來(lái)的數(shù)據(jù)幀，那么原MAC地址會(huì)是什么？A.theMACaddressoftheseivernetworkinterfaceB.theMACaddressofhostAC.theMACaddressofrouterinterfacee1D.theMACaddressofrouterinterfacee0QUESTION012Refertotheexhibit.WhattworesultswouldoccurifthehubweretobereplacedwithaswitchthatisconfiguredwithoneEthernetVLAN?(choosetwo)如圖所示，在一個(gè)以太網(wǎng)VLAN中，如果集線器用交換機(jī)代替，將會(huì)出現(xiàn)哪兩個(gè)結(jié)果？Thenumberofcollisiondomainswoulddecrease.沖突域?qū)?huì)減少Thenumberofcollisiondomainswouldincrease.沖突域?qū)?huì)增加。Thenumberofbroadcastdomainswouldremainthesame.廣播域不會(huì)改變Thenumberofcollisiondomainswouldremainthesame.沖突域不會(huì)改變E.Thenumberofbroadcastdomainswouldincrease.廣播域?qū)?huì)增加。QUESTION013Whichthreestatementsaccuratelydescribelayer2Ethernetswitches?(choosethree)下列哪三項(xiàng)準(zhǔn)確的描述了二層以太網(wǎng)交換機(jī)？Microsegmentationdecreasesthenumberofcollisionsonthenetwork.在網(wǎng)絡(luò)中，網(wǎng)絡(luò)分段減少了沖突的數(shù)量。ifaswitchreceivesaframeforanunkowndestination,itusesARPtoresolvetheaddress.如果一個(gè)交換機(jī)接受到一個(gè)未知目的幀，他們使用ARP來(lái)決定這個(gè)地址。SpanningTreeProtocolallowsswitchestoautomaticallysharevlaninformation.生成樹(shù)協(xié)議允許交換機(jī)自動(dòng)分享vlan信息。Inaproperlyfunctioningnetworkwithredundantswitchedpaths,eachswitchedaegmentwillcontainonerootbridgewithallitsportsintheforwardingstate.Allotherswitchesinthatbroadcastdomainwillhaveonlyonerootport.在一個(gè)具有冗余鏈路的交換網(wǎng)絡(luò)中，會(huì)包含一個(gè)根橋，且每個(gè)端口都處于轉(zhuǎn)發(fā)狀態(tài)，在這個(gè)廣播域中，其他交換機(jī)有且只有一個(gè)根端口。Establishingvlansincreasesthenumberofbroadcastdomains.創(chuàng)建vlan能夠增大廣播域數(shù)量。Switchesthatareconfiguredwithvlansmakeforwardingdecisionsbasedonbothlayer2andlayer3addressinformation.交換機(jī)的vlan策略配置，是基于二層和三層地址。QUESTION014WheredoesroutingoccurwithintheDoDTCP/IPreferencemodel?在DOD的TCP/IP參考模型中，路由發(fā)生在哪一層？A.applicationB.internetC.networkD.transportDoD模型：應(yīng)用層（Application）主機(jī)到主機(jī)層（HosttoHost）網(wǎng)絡(luò)互連層（Internet）網(wǎng)絡(luò)訪問(wèn)層（NetworkAccess）OSI模型：物理層(Physical)數(shù)據(jù)鏈路層(DataLink)網(wǎng)絡(luò)層(Network)傳輸層(Transport)會(huì)話層(Senssion)表示層(Presentation)應(yīng)用層(Application)QUESTION015WhichdestinationaddresseswillbeusedbyHostAtosenddatatoHostC?(Choosetwo.)主機(jī)Ａ發(fā)送數(shù)據(jù)到主機(jī)Ｃ，會(huì)使用哪個(gè)目的地址？A.theIPaddressofSwitch1B.theMACaddressofSwitch1C.theIPaddressofHostCD.theMACaddressofHostCE.theIPaddressoftherouter'sE0interfaceF.theMACaddressoftherouter'sE0interfaceQUESTION016ForwhattwopurposesdoestheEthernetprotocolusephysicaladdresses?(Choosetwo.)使用武力地址的兩個(gè)目的是什么？touniquelyidentifydevicesatLayer2在二層上識(shí)別設(shè)備。toallowcommunicationwithdevicesonadifferentnetwork在不同的網(wǎng)絡(luò)中允許通訊。todifferentiateaLayer2framefromaLayer3packet區(qū)分來(lái)自三層的包和二層的幀。toestablishaprioritysystemtodeterminewhichdevicegetstotransmitfirst創(chuàng)立一個(gè)優(yōu)先級(jí)系統(tǒng)以便確定哪個(gè)設(shè)備可以優(yōu)先傳輸。toallowcommunicationbetweendifferentdevicesonthesamenetwork同一個(gè)網(wǎng)絡(luò)中允許不同的設(shè)備通訊。toallowdetectionofaremotedevicewhenitsphysicaladdressisunknown當(dāng)物理地址未知的時(shí)候，允許遠(yuǎn)端設(shè)備檢測(cè)。QUESTION017Refertotheexhibit.Basedontheinformationgiven.Whichswitchwillbeelectedrootbridgeandwhy?如圖所示，以圖示信息，哪個(gè)交換機(jī)將會(huì)被選舉為根橋，為什么？SwitchA,becauseithasthelowestMACaddress交換機(jī)Ａ，因?yàn)樗哂懈偷模停粒玫刂?。SwitchC,becauseithasthelowestpriority交換機(jī)Ｃ，因?yàn)樗哂懈偷膬?yōu)先級(jí)。SwitchB,becauseithasthehighestMACaddress交換機(jī)Ｂ，因?yàn)樗哂懈叩模停粒玫刂?。SwitchC,becauseitisthemostcentrallylocatedswitch交換機(jī)Ｃ，因?yàn)樗钐幱诮粨Q機(jī)的中心。SwitchA,becauseitisthemostcentrallylocatedswitch交換機(jī)Ａ，因?yàn)樗钐幱诮粨Q機(jī)的中心。SwitchD,becauseithasthehighestpriority交換機(jī)Ｄ，因?yàn)樗哂懈叩膬?yōu)先級(jí)。根橋的選舉關(guān)鍵在于比較橋ID（優(yōu)先級(jí)+MAC地址）大小，小者為根橋QUESTION018Whatvalueisprimarilyusedtodeterminewhichportbecomestherootportoneachnonrootswitchinaspanning-treetopology?在非根橋的交換機(jī)上，如果要選擇根端口，哪個(gè)值是最常用的？？lowestportMACaddress更小的MAC地址。portprioritynumberandMACaddress.優(yōu)先級(jí)號(hào)和MAC地址。VTPrevisionnumberVTP版本號(hào)。highestportprioritynumber.更高的端口優(yōu)先級(jí)號(hào)。pathcost路徑開(kāi)銷。根端口的選擇依據(jù)是到達(dá)根橋開(kāi)銷最小的端口，如果開(kāi)銷相同則找端口ID最小的端口QUESTION019Refertotheexhibit.Switch-1needstosenddatatoahostwithaMACaddressof00b0.d056.efa4.WhatwillSwitch-1dowiththisdata?如圖所示，交換機(jī)１需要發(fā)送數(shù)據(jù)給一個(gè)ＭＡＣ地址為00b0.d056.efa4的主機(jī)，交換機(jī)１如何處理這個(gè)數(shù)據(jù)？switch-1willdropthedatabecauseitdosenothaveanentryforthatMACaddress交換機(jī)１會(huì)終止這個(gè)數(shù)據(jù)因?yàn)樗辉诖薓AC地址中。。switch-1willfloodthedataoutallofitsportfromwhichthedataoriginated交換機(jī)1發(fā)送給所有端口出了數(shù)據(jù)來(lái)源端口。C.switch-1willforwardthedatatoitsdefaultgateway交換機(jī)1會(huì)轉(zhuǎn)發(fā)這個(gè)數(shù)據(jù)給默認(rèn)網(wǎng)關(guān)。switch-1willsendanARPrequestoutallitsportsexcepttheportfromwhichthedataoriginated交換機(jī)1發(fā)送一個(gè)ARP請(qǐng)求給所有端口出了數(shù)據(jù)來(lái)源端口。ARP（IP-----MAC）QUESTION020Whatisthefunctionofthecommandswitchporttrunknativevlan999onaswitch?在交換機(jī)上switchporttrunknativevlan999這個(gè)命令的作用是？ItdesignatesVLAN999foruntaggedtraffic.沒(méi)有標(biāo)記的流量都打上vlan999。ItblocksVLAN999trafficfrompassingonthetrunk.阻塞VLAN999從這個(gè)鏈路通過(guò)ItcreatesaVLAN999interface.創(chuàng)立vlan999端口。ItdesignatesVLAN999asthedefaultforallunkowntaggedtraffic.制定所有的未知標(biāo)記幀為VLAN999。本征vlan都是不打標(biāo)記的。QUESTION021Whichtwoprotocolsareusedbybridgesand/orswitchestopreventloopsinalayer2network?(Choosetwo.)哪兩個(gè)協(xié)議是用于二層網(wǎng)絡(luò)下的交換機(jī)和網(wǎng)橋，防止環(huán)路產(chǎn)生的協(xié)議？A.802.1dB.VTPC.802.1qD.STPE.SAPQUESTION022WhichswitchwouldSTPchoosetobecometherootbridgeintheselectionprocess?在STP選舉過(guò)程中，哪個(gè)交換機(jī)將會(huì)成為根橋？A.32768:11-22-33-44-55-66B.32768:22-33-44-55-66-77C.32769:11-22-33-44-55-65D.32769:22-33-44-55-66-78依據(jù)：交換機(jī)的ID=優(yōu)先級(jí)+MAC地址優(yōu)先級(jí)必須是4096的整倍數(shù)+Vlan號(hào)QUESTION023Aswitchisconfiguredwithallportsassignedtovlan2withfullduplexFastEthernettosegmentexistingdepartmentaltraffic.WhatistheeffectofaddingswitchportstoanewVLANontheswitch?一個(gè)交換機(jī)的所有端口分配在VLAN2里，且使用的是全雙工快速以太網(wǎng)?，F(xiàn)在把交換機(jī)的端口劃分到新的vlan中會(huì)發(fā)生什么？Morecollisiondomainswillbecreated.更多的沖突域?qū)?huì)創(chuàng)建。IPaddressutilizationwillbemoreefficient.IP地址利用率將會(huì)更有效。Morebandwidthwillberequiredthanwasneededpreviously.比以前需要更多的帶寬。Anadditionalbroadcastdomainwillbecreated.一個(gè)額外的廣播域?qū)?huì)創(chuàng)建。QUESTION024Whatarethreebenefitsofimplementingvlans?(choosethree)實(shí)施vlan有哪三項(xiàng)好處？Amoreefficientuseofbandwidthcanbeachievedallowingmanyphysicalgroupstousethesamenetworkinfrastructure一個(gè)更有效利用帶寬，這樣可以允許更多的物理組使用同一個(gè)網(wǎng)絡(luò)基礎(chǔ)設(shè)施。Broadcaststormscanbemitigatedbydecreasingthenumberofbroadcastdomains,thusincreasingtheirsize.廣播風(fēng)暴會(huì)被抑制，通過(guò)減小廣播域的數(shù)量和增大廣播域的大小。Ahigherlevelofnetworksecuritycanbereachedbyseparatingsensitivedatatrafficfromothernetworktraffic.通過(guò)分割不同的網(wǎng)絡(luò)數(shù)據(jù)從而達(dá)到更高的網(wǎng)絡(luò)安全。Port-basedvlansincreaseswitch-portuseefficient,thanksto802.1Qtrunks基于端口的vlan提高了交換機(jī)端口的使用效率，由于采用的是802.1Q。Amoreefficientuseofbandwidthcanbeachievedallowingmanylogicalnetworkstousethesamenetworkinfrastructure.一個(gè)更有效利用帶寬，這樣可以允許更多的邏輯組組使用同一個(gè)網(wǎng)絡(luò)基礎(chǔ)設(shè)施。Broadcaststormscanbemitigatedbyincreasingthenumberofbroadcastdomains,thusreducingtheirsize.廣播風(fēng)暴會(huì)被抑制，通過(guò)增大廣播域的數(shù)量和減少?gòu)V播域的大小。VLANsmakeiteasierforITstafftoconfigurenewlogicalgroups,becausethevlansallbelongtothesamebroadcastdomain.Vlan使得管理員更簡(jiǎn)易的配置新的邏輯分組，因?yàn)檫@個(gè)vlan都是屬于同一廣播域中。QUESTION025WhichIEEEstandardprotocolisinitiatedasaresultofsuccessfulDTPcompletioninaswitchoverFastEthernet?下列哪一個(gè)IEEE標(biāo)準(zhǔn)協(xié)議是一個(gè)快速以太網(wǎng)交換機(jī)中DTP過(guò)程的結(jié)果？A.802.3adB.802.1wC.802.1QD.802.1dQUESTION026WhichofthefollowingarebenefitsofVLANs?(Choosethree.)下列哪三項(xiàng)是vlan的好處？Theyincreasethesizeofcollisiondomains.他們?cè)黾恿藳_突域的大小。Theyallowlogicalgroupingofusersbyfunction.他們?cè)试S根據(jù)使用者功能進(jìn)行邏輯分組。Theycanenhancenetworksecurity.他們能提高網(wǎng)絡(luò)安全性。Theyincreasethesizeofbroadcastdomainswhiledecreasingthenumberofcollisiondomains.他們?cè)黾恿藦V播域的大小，并減少?zèng)_突域的數(shù)量。Theyincreasethenumberofbroadcastdomainswhiledecreasingthesizeofthebroadcastdomains.他們?cè)黾恿藦V播域的數(shù)量并減少了廣播域的大小。Theysimplifyswitchadministration.他們簡(jiǎn)化了管理。QUESTION027Refertotheexhibit.AtechnicianhasinstalledSwithchBandneedstoconfigureitforremoteaccessfromthemanagementworkstationconnectedSwitchAWhichsetofcommandsisrequiredtoaccomplishthistask?如圖所示，一個(gè)技術(shù)員已經(jīng)安裝好交換機(jī)B和配置它使能通過(guò)交換機(jī)A遠(yuǎn)程訪問(wèn)并且管理，那個(gè)命令是可以完成這個(gè)任務(wù)的？A.SwitchB(config)#interfaceFastEthernet0/1SwitchB(config)#ipaddress52SwitchB(config)#noshutdownB.SwitchB(config)#ipdefault-gateway54SwitchB(config)#interfacevlan1SwitchB(config)#ipaddress52SwitchB(config)#noshutdownC.SwitchB(config)#interfacevlan1SwitchB(config)#ipaddress52SwitchB(config)#ipdefault-gateway54SwitchB(config)#noshutdownD.SwitchB(config)#ipdefault-network54SwitchB(config)#interfacevlan1SwitchB(config)#ipaddress52SwitchB(config)#noshutdownQUESTION028InanEthernetnetwork,underwhattwoscenarioscandevicestransmit?(Choosetwo.)在以太網(wǎng)中，哪兩種情況，設(shè)備可以傳輸數(shù)據(jù)？whentheyreceiveaspecialtoken當(dāng)接受到一個(gè)特定的令牌時(shí)whenthereisacarrier當(dāng)有一個(gè)載體的時(shí)候C.whentheydetectnootherdevicesaresending沒(méi)有檢測(cè)到其他設(shè)備在發(fā)送數(shù)據(jù)whenthemediumisidle當(dāng)傳輸介質(zhì)為空閑狀態(tài)whentheservergrantsaccess當(dāng)服務(wù)器允許訪問(wèn)的時(shí)候載波偵聽(tīng)多路訪問(wèn)/沖突檢測(cè)(CSMA/CD)QUESTION029WhichtwostatesaretheportstateswhenRSTPhasconverged?(choosetwo)當(dāng)RSTP收斂的時(shí)候，端口會(huì)處于哪兩種狀態(tài)？A.blockingB.learningC.discardingD.forwardingE.listeningQUESTION030Whichtwocommandscanbeusedtoverifyatrunklinkconfigurationstatusonagivenciscoswitch?(choosetwo)那兩個(gè)命令被用來(lái)在思科交換機(jī)上查看中繼鏈路？A.showinterfacesinterfaceB.showinterfacestrunkC.showinterfacesswitchportD.showipinterfacebriefE.showinterfacesvlanQUESTION031WhichcommandenablesRSTPonaswitch?在交換機(jī)上使用哪條命令開(kāi)啟RSTP？A.spanning-treemoderapid-pvstB.spanning-treeuplinkfastC.spanning-treebackbonefastD.spanning-treemodemstQUESTION032Whichofthefollowingstatementsdescribethenetworkshowninthegraphic?(Choosetwo.)在下圖表中，有關(guān)描述正確的是？Therearetwobroadcastdomainsinthenetwork.這個(gè)網(wǎng)絡(luò)有兩個(gè)廣播域。Therearefourbroadcastdomainsinthenetwork.這個(gè)網(wǎng)絡(luò)有４個(gè)廣播域。Therearesixbroadcastdomainsinthenetwork.這個(gè)網(wǎng)絡(luò)有６個(gè)廣播域。Therearefourcollisiondomainsinthenetwork.這個(gè)網(wǎng)絡(luò)有４個(gè)沖突域。Therearefivecollisiondomainsinthenetwork.這個(gè)網(wǎng)絡(luò)有５個(gè)沖突域。Therearesevencollisiondomainsinthenetwork.這個(gè)網(wǎng)絡(luò)有７個(gè)沖突域。QUESTION033Refertotheexhibit.AllswitchportsareassignedtothecorrectVLANs,butnoneofthehostsconnectedtoSwitchAcancommunicatewithhostsinthesameVLANconnectedtoSwitchB.Basedontheoutputshown,whatisthemostlikelyproblem?如圖所示，所有的交換機(jī)端口已經(jīng)正確的配置在同一個(gè)vlan下。但是交換機(jī)A上的所有主機(jī)都不能和處于同一vlan下的交換機(jī)B上的主機(jī)通信，根據(jù)輸入，最有可能的問(wèn)題出現(xiàn)在？TheaccesslinkneedstobeconfiguredinmultipleVLANs.Access鏈路必須配置成多條vlan。ThelinkbetweentheswitchesisconfiguredinthewrongVLAN.兩個(gè)交換機(jī)之間的鏈路配置在錯(cuò)誤的VLAN中。Thelinkbetweentheswitchesneedstobeconfiguredasatrunk.兩個(gè)交換機(jī)之中應(yīng)該配置為trunk鏈路。VTPisnotconfiguredtocarryVLANinformationbetweentheswitches.VTP是不能在兩臺(tái)交換機(jī)之間傳輸vlan的的。E.SwitchIPaddressesmustbeconfiguredinorderfortraffictobeforwardedbetweentheswitches交換機(jī)IP必須配置以便在兩臺(tái)交換機(jī)之間交換機(jī)信息。QUESTION034Refertotheexhibit.GiventheoutputshownfromthisCiscoCatalyst2950,whatisthemostlikelyreasonthatinterfaceFastEthernet0/10isnottherootportforVLAN2?如下圖所示為思科Catalyst2950交換機(jī)的輸入信息，端口f0/10沒(méi)有成為vlan2的根端口的最有可能原因是什么？ThisswitchhasmorethanoneinterfaceconnectedtotherootnetworksegmentinVLAN2.這個(gè)交換機(jī)有超過(guò)１個(gè)的端口和vlan2的根橋直連。ThisswitchisrunningRSTPwhiletheelecteddesignatedswitchisrunning802.1dSpanningTree.當(dāng)指定交換機(jī)運(yùn)行802.1d生成樹(shù)的時(shí)候，這個(gè)交換機(jī)是運(yùn)行RSTP。Thisswitchinterfacehasahigherpathcosttotherootbridgethananotherinthetopology.在這個(gè)拓?fù)渲?，此交換機(jī)比其他交換機(jī)到根橋具有更高的開(kāi)銷。D.ThisswitchhasalowerbridgeIDforVLAN2thantheelecteddesignatedswitch.在vlan2中，這個(gè)交換機(jī)比指定交換機(jī)具有更低的橋ID。QUESTION035Whywillaswitchneverlearnabroadcastaddress?為什么交換機(jī)不會(huì)學(xué)習(xí)到廣播地址？Broadcastframesareneversenttoswiches.廣播幀不能發(fā)送給交換機(jī)。Broadcastaddressesuseanincorrectformatfortheswitchingtable.交換緩存表中的廣播地址使用一個(gè)錯(cuò)誤的格式。Abroadcastaddresswillneverbethesourceaddressofaframe.一個(gè)廣播地址不可能作為一個(gè)幀的原地址的。Broadcastsonlyusenetworklayeraddressing.廣播只能使用在網(wǎng)絡(luò)層。Abroadcastframeisneverforwardedbyaswitch.一個(gè)廣播幀不會(huì)背交換機(jī)轉(zhuǎn)發(fā)。QUESTION36Refertotheexhibit.WhyhasthisswitchnotbeenelectedtherootbridgeforVLAN1?如圖所示，為什么這個(gè)交換機(jī)不能當(dāng)選為vlan1的根橋？Ithasmorethanoneinterfacethatisconnectedtotherootnetworksegment.超過(guò)一個(gè)接口連接在根網(wǎng)絡(luò)斷中。ItisrunningRSTPwhiletheelectedrootbridgeisrunning802.1dspanningtree.當(dāng)選舉根橋的時(shí)候，這個(gè)交換機(jī)運(yùn)行RSTP，而根橋運(yùn)行的是802.1D生成樹(shù)協(xié)議。IthasahigherMACaddressthantheelectedrootbridge.它比根橋具有一個(gè)更高的MAC地址。IthasahigherbridgeIDthantheelectedrootbridge.它比根橋具有一個(gè)更高的橋ID。QUESTION037WhichtwolinkprotocolsareusedtocarrymultipleVLANsoverasinglelink?(Choosetwo.)下列那兩個(gè)鏈路協(xié)議，被使用在單連璐中多vlan之間的信息傳輸？A.VTPB.802.1qIEEE標(biāo)準(zhǔn)C.IGPD.ISL思科標(biāo)準(zhǔn)E.802.3uQUESTION038assumingthedefaultswitchconfigurationwhichvlanrangecanbeaddedmodifiedandremovedonaciscoswitch?在一臺(tái)采用默認(rèn)配置的思科交換機(jī)上，能進(jìn)行修改你和操作的vlan區(qū)間是？A.2through1001B.1through1001C.1through1002D.2through1005QUESTION039Whichstatementaboutvlanoperationonciscocatalystswitchesistrue?下列哪一項(xiàng)關(guān)于思科catalyst交換機(jī)中vlan的描述是正確的？whenapacketisreceivedfroman802.1Qtrunk,thevlanidcanbedeterminedfromthesourceMACaddresstable.當(dāng)接受到一個(gè)來(lái)自802.1Q鏈路的數(shù)據(jù)包時(shí)，vlan號(hào)是依靠源MAC地址表來(lái)確定的。unkownunicastframesareretransmittedonlytotheportsthatbelongtothesamevlan未知的單播幀只在相同的vlan端口之間傳播。portsbetweenswitchesshouldbeconfiguredinaccessmodesothatvlanscanspanacrosstheports交換機(jī)端口之間應(yīng)該配置成access模式，以便vlan之間能穿過(guò)端口。D.broadcastandmulticastframesareretransmittedtoportsthatareconfiguredondifferentvlan.廣播和多播幀，可以通過(guò)配置轉(zhuǎn)發(fā)到不同的vlan當(dāng)中。QUESTION040Refertothetopologyshownintheexhibit.WhichportswillbeSTPdesignatedportsifallthelinksareoperatingatthesamebandwidth?(Choosethree.)如下圖所示拓?fù)渲?，所有端口都處在相同帶寬中，那些端口將被STP作為指定端口？A.SwitchA-Fa0/0B.SwitchA-Fa0/1C.SwitchB-Fa0/0D.SwitchB-Fa0/1E.SwitchC-Fa0/0F.SwitchC-Fa0/1QUESTION041Refertotheexhibit.HowshouldtheFastEthernet0/1portonthe2950modelswitchesthatareshownintheexhibitbeconfiguredtoallowconnectivitybetweenalldevices?如圖所示，相關(guān)配置如下，請(qǐng)問(wèn)在2950的f0/1端口上應(yīng)該如何配置才能讓所有設(shè)備互通？A.Theportsonlyneedtobeconnectedbyacrossovercable.B.SwitchX(config)#interfaceFastEthernet0/1SwitchX(config-if)#switchportmodetrunkC.SwitchX(config)#interfaceFastEthernet0/1SwitchX(config-if)#switchportmodeaccessSwitchX(config-if)#switchportaccessvlan1D.SwitchX(config)#interfaceFastEthernet0/1SwitchX(config-if)#switchportmodetrunkSwitchX(config-if)#switchporttrunkvlan1SwitchX(config-if)#switchporttrunkvlan10SwitchX(config-if)#switchporttrunkvlan20QUESTION042RefertotheexhibitAframeonvlan1onswitchs1issenttoswitchs2whentheframeisreceivedonvlan2,whatcausesthisbehavior?如圖所示，一個(gè)處于vlan1的交換機(jī)S1發(fā)送幀到交換機(jī)S2的vlan2中，會(huì)發(fā)生什么？trunkmodemismatchestrunk模式不匹配。vlansthatdonotcorrespondtoauniqueIPsubnetvlan相當(dāng)于一個(gè)獨(dú)立的IP子網(wǎng)。nativevlanmismatches本征vlan不匹配。allowingonlyvlan2onthedestination.目的地只允許vlan2.QUESTION043WhichthreestatementsaboutRSTParetrue?(choosethree)下列關(guān)于RSTP描述中哪三項(xiàng)是正確的？RSTPsignificantlyreducestopologyreconvergingtimeafteralinkfailure.在一條鏈路失效的時(shí)候，RSTP能有效的降低拓?fù)渚蹠?huì)時(shí)間。RSTPexpendstheSTPportrolesbyaddingthealternateandbackuproles.RSTP在STP的角色基礎(chǔ)上增加了alternate和bakup端口。RSTPportsatatesareblocking,discarding,learing,orforwarding.RSTP端口定義有：blocking、discarding、learing和forwarding。RSTPalsousestheSTPproprsal-agreementsequence.RSTP也使用STPproprsal-agreement序列。RSTPusethesametimer-baseedprocessasSTPonpoint-to-pointlinks.在點(diǎn)到點(diǎn)的鏈路中RSTP使用與STP一樣的間隔時(shí)間。F.RSTPprovidesafastertransitiontotheforwardingstateonpoint-to-pointlinksthanSTPdoes.在點(diǎn)到點(diǎn)的鏈路中，RSTP比STP提供更快速度使端口進(jìn)入轉(zhuǎn)發(fā)狀態(tài)。QUESTION044AtwhichlayeroftheOSImodelisRSTPusedtopreventloops?RSTP使用OSI的哪一層來(lái)組織環(huán)路？datalink數(shù)據(jù)鏈路層network網(wǎng)絡(luò)層physical物理層transport傳輸層QUESTION045WhatdoseaLayer2switchusetodecidewheretoforwardareceivedframe?一個(gè)二層交換機(jī)如何確定收到的幀發(fā)哪里轉(zhuǎn)發(fā)？sourceMACaddress源ＭＡＣ地址。sourceIPaddress源IP地址。sourceswitchport源端口。destinationIPaddress目的IP地址。destinationportaddress目的端口地址。destinationMACaddress目的MAC地址。QUESTION046Refertotheexhibit.Whichstatementistrue?如圖所示，哪個(gè)描述是正確的？TheFa0/11roleconfirmsthatSwitchAistherootbridgeforVLAN20.交換機(jī)Ａ的f0/11是vlan20的根橋角色。VLAN20isrunningthePerVLANSpanningTreeProtocol.Vlan20運(yùn)行了STP協(xié)議。TheMACaddressoftherootbridgeis0017.596d.1580.根橋的MAC地址是0017.596d.1580.SwitchAisnottherootbridge,becausenotalloftheinterfacerolesaredesignated.交換機(jī)A不是根橋，因?yàn)椴⒎撬械亩丝诙际侵付ǘ丝?。QUESTION047WhichtwobenefitsareprovidedbycreatingVLANs?(Choosetwo.)建立vlan具有哪兩項(xiàng)好處？addedsecurity增加安全性。dedicatedbandwidth專用帶寬。providessegmentation提供網(wǎng)絡(luò)分段。allowsswitchestoroutetrafficbetweensubinterfaces允許交換機(jī)和路由器通過(guò)子接口聯(lián)系。containscollisions包含沖突。QUESTION048WhichcommandcanbeusedfromaPCtoverifytheconnectivitybetweenhoststhatconnectthroughaswitchinthesameLAN?在同一個(gè)局域網(wǎng)內(nèi)的一臺(tái)交換機(jī)上，下列哪一個(gè)命令能用來(lái)檢測(cè)主機(jī)之間的連通性？A.pingaddressB.tracertaddressC.tracerouteaddressD.arpaddressQUESTION049Basedonthenetworkshowninthegraphicwhichoptioncontainsthepotentialnetworkingproblemandprotocolorsettingthatcantopreventtheproblem?參照如圖所示圖表，哪一個(gè)選項(xiàng)可以包含了潛在的網(wǎng)絡(luò)問(wèn)題，以及協(xié)議或是能組阻止這個(gè)問(wèn)題？Routingloops,holddowntimers路由環(huán)路，抑制計(jì)時(shí)器。Switchingloops,splithorizon交換環(huán)路，水平分割。Routingloops,splithorizon路由環(huán)路，水平分割。Switchingloops,VTP交換環(huán)路，VTP。Routingloops,STP路由環(huán)路，STP。Switchingloops,STP交換環(huán)路，STP。QUESTION050Refertotheexhibit.WhichtwostatementsaretrueaboutinterVLANroutinginthetopologythatisshownintheexhibit?(Choosetwo.)如下圖所示，在此拓?fù)渲校瑅lan之間的路由描述，下列哪兩項(xiàng)是正確的？HostEandhostFusethesameIPgatewayaddress.主機(jī)E和主機(jī)F使用相同的網(wǎng)關(guān)IP地址。Router1andSwitch2shouldbeconnectedviaacrossovercable.路由器1和交換機(jī)2應(yīng)該通過(guò)交叉電腦通訊。Router1willnotplayaroleincommunicationsbetweenhostAandhostD.主機(jī)A和主機(jī)D之間的通訊，路由器A沒(méi)有起作用。TheFastEthernet0/0interfaceonRouter1mustbeconfiguredwithsubinterfaces.R1上的F0/0端口，必須配置子接口。Router1needsmoreLANinterfacestoaccommodatetheVLANsthatareshownintheexhibit.如圖所示中，R1需要更多的LAN接口，用來(lái)vlan之間的通訊。TheFastEthernet0/0interfaceonRouter1andSwitch2trunkportsmustbeconfiguredusingthesameencapsulationtype.R1的f/0和SW2之間的中繼鏈路必須配置成使用相同封裝類型。QUESTION051Whichtwoofthesearecharacteristicsofthe802.1Qprotocol?(choosetwo)802.1Q具有哪兩項(xiàng)特征？A.itisalayer2messagingprotocolwhichmaintainsvlanconfigurationsacrossnetwork.這是個(gè)二層信息協(xié)議，保證vlan配置能穿過(guò)網(wǎng)絡(luò)。itincludesan8-bitfieldwhichspecifiesthepriorityofaframe.數(shù)據(jù)幀中包含了8個(gè)比特字節(jié)指定優(yōu)先級(jí)。itisusedexclusivelyfortaggingvlanframesanddosenotaddressnetworkreconvergencefollowingswitchednetworktopologychanges.唯一的一個(gè)用于標(biāo)記vlan數(shù)據(jù)幀和交換網(wǎng)絡(luò)收斂的信息協(xié)議。itmodifiesthe802.3frameheader,andthusrequiresthattheFCSberecomputed.修改了802.3幀的頭部，并且會(huì)重新計(jì)算FCS的值。itisatrunkingprotocolcapableofcarringuntaggedframes.能傳輸未標(biāo)記幀的trunk協(xié)議。QUESTION052Refertotheexhibit.Eachofthesefourswitcheshasbeenconfiguredwithahostname,aswellasbeingconfiguredtorunRSTP.Nootherconfigurationchangeshavebeenmade.WhichthreeoftheseshowthecorrectRSTPportrolesfortheindicatedswitchesandinterfaces?(Choosethree.)如圖所示，4臺(tái)交換機(jī)都配置了主機(jī)名，RSTP也已經(jīng)配置完畢。沒(méi)有其他配置改變。下列那三項(xiàng)正確的表明了交換機(jī)的端口？A.SwitchA,Fa0/2,designatedB.SwitchA,Fa0/1,rootC.SwitchB,Gi0/2,rootD.SwitchB,Gi0/1,designatedE.SwitchC,Fa0/2,rootF.SwitchD,Gi0/2,rootQUESTION053Refertotheexhibit.ThenetworkadministratornormallyestablishesatelnetsessionwiththeswitchfromhostA.However,hostAisunavailable.Theadministrator′sattempttotheswitchfromhostBfails,butpingstotheothertwohostsaresuccessful.whatistheissue?如圖所示，一個(gè)網(wǎng)絡(luò)管理員正常的建立了交換機(jī)和主機(jī)A之間的telnet會(huì)話。然后，主機(jī)A不可用。這個(gè)管理員嘗試從主機(jī)B也失敗。但是ping其他兩臺(tái)主機(jī)成功，這是什么問(wèn)題？HostBandtheswitchneedtobeinthesamesubnet.主機(jī)Ｂ和交換機(jī)需要在同一個(gè)子網(wǎng)下。Theswitchneedsandappropriatedefaultgatewayassigned.交換機(jī)需要分配適當(dāng)?shù)哪J(rèn)網(wǎng)關(guān)。Theswitchinterfaceconnectedtotherouterisdown.交換機(jī)和路由器之間的端口關(guān)閉了。HostBneedtobeassignedanIPaddressinvlan1.主機(jī)Ｂ需要分配一個(gè)在vlan1中的IP地址。TheswitchinterfacesneedtheappropriateIPaddressesassigned.這個(gè)交換機(jī)接口需要分配一個(gè)IP地址。QUESTION054Refertotheexhibit.Whatswitchprovesthespanning-treedesignatedportroleforthenetworksegmentthatservicestheprinters?如圖所示，哪一個(gè)交換機(jī)為這個(gè)網(wǎng)絡(luò)段中的打印機(jī)提供了生成樹(shù)中的指定端口？A.Switch1B.Switch2C.Switch3D.Switch4QUESTION055WhatisonebenefitofPVST+?下列哪一項(xiàng)是PVST+的好處？PVST+reducestheCPUcyclesforalltheswitchesinthenetwork在交換網(wǎng)絡(luò)中PVST+降低了CPU周期。PVST+automaticallyselectstherootbridgelocation,toprovideoptimizedbandwidthusage.PVST+自動(dòng)選擇根橋，以便提高帶寬利用率。PVST+allowtherootswitchlocationtobeoptimizedpervlan.PSVT+允許每個(gè)vlan創(chuàng)建一個(gè)根橋。PVST+supportsLayer3loadbalancingwithoutloops.PVST+支持三層的負(fù)載均衡。QUESTION056WhicharevalidmodesforaswitchportusedasaVLANtrunk?(Choosethree.)當(dāng)交換機(jī)端口處于以下哪些模式下，能被用作trunk鏈路中？A.transparentB.autoC.onD.desirableE.blockingF.forwardingauto：取決于對(duì)端的狀態(tài)，對(duì)方可以是on或者desirable，對(duì)方不能是autoon：設(shè)定為trunk，switchportmodetrunkdesirable：盡量成為trunk，QUESTION057Howmanybroadcastdomainsareshowninthegraphicassumingonlythedefaultvlanisconfiguredontheswitches?如圖所示，假設(shè)所有交換機(jī)上只配置了默認(rèn)vlan，請(qǐng)問(wèn)圖示中有多少個(gè)廣播域？A.oneB.sixC.twelveD.twoQUESTION058Whichthreeofthesestatementsregarding802.1Qtrunkingarecorrect?(Choosethree.)那三個(gè)關(guān)于802.1Q的描述是正確的？802.1QnativeVLANframesareuntaggedbydefault.802.1Q本征vlan幀是默認(rèn)的未打標(biāo)記的。B.802.1Qtrunkingportscanalsobesecureports.802.1Q是trunk鏈路端口可以配置安全的端口。C.802.1Qtrunkscanuse10Mb/sEthernetinterfaces.802.1Q鏈路可以使用10M以太網(wǎng)接口。D.802.1Qtrunksrequirefull-duplex,point-to-pointconnectivity.802.1Q鏈路需要全雙工，點(diǎn)到點(diǎn)的連接。E.802.1QtrunksshouldhavenativeVLANsthatarethesameatbothends.802.1Q鏈路兩段應(yīng)該擁有相同的本征VLAN。QUESTION059Refertotheexhibit.Theoutputthatisshownisgeneratedataswitch.Whichthreeofthesestatementsaretrue?(Choosethree.)如圖所示，一個(gè)交換機(jī)的輸出結(jié)果如下，那三項(xiàng)描述是正確的？Allportswillbeinastateofdiscarding,learning,orforwarding.所有端口都處于discarding,learning,orforwarding三種狀態(tài)。ThirtyVLANshavebeenconfiguredonthisswitch.三個(gè)vlan配置在這個(gè)交換機(jī)上。C.