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2021思科認證考試真題6節(jié)第1節(jié)
下列哪項OSI第2層功能是由PPP協(xié)議標準規(guī)范,但使用CISCO專有的
HDLC報頭字段實現(xiàn)
A成幀
B.尋址
C.錯誤檢測
D識別幀內(nèi)的協(xié)議類型
正確答案:D
CHAP驗證時,將對方的主機名HOST作為自己的用戶名USER。
此題為判斷題(對,錯)。
正確答案:V
YouhavesetupanInternetbasedFTPserver,wherepeoplecanuploadand
downloadfiles.IntermsoftheOSImodel,whatisthehighestlayerusedduring
theFTPsessions.
A.Application
B.Presentation
C.Session
D.Transport
E.Internet
F.DataLink
G.Physical
正確答案:A
A解析:Explanation:
Theapplicationlayeristhehighestlayer(layer7)oftheOSImodel,andis
reservedforenduserapplications.SinceFTPisitselfanapplication,layer7isthe
highestlayerused.
IncorrectAnswers:
B,C,D,E,F,G.InanygivenFTPsession,alloftheselayerswillbeusedatsome
pointbuttheyareincorrectbecausethequestionaskedforthehighestlayer
usedbyFTP.
幀中繼環(huán)境中,CIR的含義是()
A.提高線路速率
B.保證線路速率
C.降低線路速率
。配置線路速率
正確答案:B
下列哪兩項用于在配置OSPF路由進程時確定路由器ID()
A.第一個快速以太網(wǎng)接口的1P地址
B.任何邏輯接口的最大IP地址
C.任何物理接口的最大IP地址
D.默認網(wǎng)關的IP地址
E.優(yōu)先級為1的任何物理接口
正確答案:BC
2021思科認證考試真題6節(jié)第2節(jié)
某網(wǎng)絡中,擬設計10子網(wǎng),每個子網(wǎng)中放有14臺設備,用IP地址段為
199.41.10.X,請問符合此種規(guī)劃的子網(wǎng)掩碼是()
A.
B.
C.40
D.
正確答案:C
OSPF在同一區(qū)域內(nèi),下列說法正確的是()
A.每臺路由器生成的LSA都是相同的
B.每臺路由器的LSDB(鏈路狀態(tài)數(shù)據(jù)庫)都是相同的
C.每臺路由器根據(jù)該LSDB計算出的最短路徑樹都是相同的
D.每臺路由器根據(jù)該最短路徑樹計算出的路由都是相同的
正確答案:B
以下哪個命令讓路由器在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
TheEzonexamnetworkTopologyisdisplayedintheexhibitbelow:
AswitchhasbeenconfiguredforthreedifferentVLANs:VLAN2,VLAN3,
andVLAN4.ForthepurposesofcommunicationbetweenVLANsarouteristobe
added.HostfromoneVLANshouldbeabletoreachthehostsintheother
VLANs.
Basedonthisrequirement,whattypeofconnectionisacceptablebetween
therouterandswitch?
(Selectallvalidanswers)
A.10MbpsEthernet
B.56kbpsserial
C.100MbpsEthernet
D.1,544Mbpsserial
E.1000MbpsEthernet
正確答案:CE
解析:Explanation:Forallhoststobeabletoreacheachother,inter-
VLANroutingwillneedtobeconfigured.Inordertoprovidelnter-
VLANroutingbetweentherouterandtheswitch,atrunkwillneedtobesetup.Thistrunkca
nbeeitherISLor802.1Q.Onarouter,theinterfacethatistobeusedasthetrunkcanbel00
MbpsEthernetGigabitEthernetorlOGigabitEthernet.Therefore^nlychoicesCorEare
correct.
WithregardtoEthernetmediaaccessmethods,whichofthefollowingare
true?
(Chooseallthatapply.)
A.Adevicewaitsforanelectronicsignalbeforetransmitting.
B.Adevicelistensandwaitsuntilthemediaisnotbusybeforetransmitting.
C.AlldevicesonanEthernetsegmentseedatathatpassesonthenetwork
medium.
D.Onlythesenderandthereceiverdevicesseedatathatpassesonthe
networkmedium.
E.Ethernetnetworksallowyoutoconfigureddeviseswithhigher
transmissionpriority.
正確答案:BC
解析:Explanation:
EthernetusestheCSMA/CDaccessmethod.
CSMA/CDlogichelpspreventcollisionsandalsodefineshowtoactwhena
collisiondoesoccur.TheCSMA/CDalgorithmwordslikethis:
1.Adevicewithaframe,tosendlistensuntiltheEthernetisnotbusy.
2.WhentheEthernetisnotbusy,thesenderbeginssendingtheframe.
3.Thesenderlistenstomakesurethatnocollisionoccurred.
4.Oncethesendershearthecollision,theyeachsendajammingsignal,to
ensurethatallstationsrecognizethecollision.
5.Afterthejammingiscomplete,eachsenderrandomizesatimerandwaitsthat
long.
6Wheneachtimerexpires,theprocessstartsoverwithStep1.
So,alldevicesontheEthernetneedtouseCSMA/CDtoavoidcollisionsandto
recoverwheninadvertentcollisionsoccur.
2021思科認證考試真題6節(jié)第3節(jié)
osi七層模型中,數(shù)據(jù)鏈路層的數(shù)據(jù)封裝名稱為()
A.比特
B幀
C包
D.段
正確答案:B
AfterworkingallnightandsuccessfullyconfiguringaCiscorouterforthe
Ezonexamnetworkyousaveyourchangesonthestartupconfig,rebootthe
router,andgooutforacigarette.Whenyoureturn,noneofyourchangesare
activeandtherouterbootstotheinitialconfigurationmode!Whichofthe
choicesbelowindicatesthesourceofyourproblem?
A.HardwarefailureinNVRAMpreventstherouterfromloadingtheconfig
B.Startup-configinflashiscorruptandcannotbeanalyzed
C.Routerconfiguration-registersettobypassstartupconfiguration
D.Startup-configinNVRAMiscorruptandcannotbeanalyzed
E.Noneoftheabove
正確答案:C
解析:Explanation:
Thedefaultconfiguration-registersettingof0x2102loadstheIOSfromflashand
theconfigurationfromNVRAM.
However,forpasswordrecovery,youcansettheregisterto0x2142andthe
startup-configfileinNVRAMwillbebypassed.Theproblemdescribedhereis
thattheconfigregisterwasnotchangedbackto0x2102beforetherouterwas
rebooted,sotheactiveconfigurationisbypassed.Simplysettingtheconfig
registerbackto0x2102willfixthisproblem.
IncorrectAnswers:
A,B,D.Allofthesedescribehardwareorsoftwareerrors.Intheeventthatthisis
theproblem,errorswillbegeneratedandtherouterwillfailtobootproperly.In
thesecases,therouterwillnotreturntotheinitialstartupconfiguration.
混合型協(xié)議既具有〃距離矢量路由協(xié)議”的特性,又具有“鏈路狀態(tài)路由協(xié)議'’的
特性,下列協(xié)議中屬于混合型協(xié)議的是:()
A.RIP
B.OSPF
C.EIGRP
D.IGRP
正確答案:C
下列哪一設備工作時,要用到OSI的七個層(一層到七層)()
A.PC
B.網(wǎng)管機
C.WEB服務器
D.交換機
E.路由器
正確答案:ABC
配置LACP時,在要使用的接口上必須將哪三個參數(shù)配置得完全相同?()
A.虛擬MAC地址
B端口速度
C.雙工模式
D.PortFast
E.VLAN信息
答案:BCE
2021思科認證考試真題6節(jié)第4節(jié)
TheEzonexamnetworkadministratorhasjustissuedthe"switchporttrunk
nativevlan998"commandonswitchVE2.Whatisthefunctionofthiscommand?
A.ItdesignatesVLAN998asthedefaultforallunknowntaggedtraffic
B.ItdesignatesVLAN998foruntaggedtraffic
C.ItblocksVLAN998trafficfrompassingonthetrunk
D.ItcreatesaVLAN998interface
E.Noneoftheabove
正確答案:B
下列哪項OSI第2層功能是由PPP協(xié)議標準規(guī)范,但使用CISCO專有的
HDLC報頭字段實現(xiàn)
A成幀
B.尋址
C.錯誤檢測
D識別幀內(nèi)的協(xié)議類型
正確答案:D
下列路由協(xié)議中,屬于鏈路狀態(tài)路由協(xié)議的是()
A.RIP
B.EIGRP
C.IGRP
D.OSPF
正確答案:D
EzonexamisusingIPaddressingaccordingtoRFC1918.Whichthreeaddress
rangesareusedforinternalprivateaddressblocksasdefinedbyRFC1918?
(Chooseallthatapply)
A.to255.255.255
B.to55
C.to55
D.to55
E..to55
F.to55
G.to55
正確答案:BDF
B,D,F解析:Explanation:
RFC1918definesthreedifferentIPaddressrangesasprivate,meaningthatthey
canbeusedbyanyprivatenetworkforinternaluse,andtheserangesarenotto
beusedintheInternet.TheclassAprivaterangeisto55.
TheclassBaddressrangeisto55.TheclassCprivateIP
addressrangeisto55.
IncorrectAnswers:
A.Thenetworkaddressisinvalidandcannotbeused.
C.Thecorrectaddressrangeis172.16.X.Xthrough172.31.X.X
E.TheaddressisreservedfortheinternalloopbackIPaddress,butthe
entire127.X.X.XrangeisnotdefinedinRFC1918asaprivateaddressrangefor
networks.
G.ThisaddressrangedescribestheclassDmulticastaddressrange.
為將當前運行的配置復制到TFTP服務器上,需要哪個命令?()
A.copyrunning-configtftp
B.copystartup-configtftp
C.copytftprunning-config
D.copytftpstartup-config
正確答案:A
2021思科認證考試真題6節(jié)第5節(jié)
InaswitchedLANnetwork,whatistheSpanning-Treealgorithmusedfor?
A.Itisusedtoprovideamechanismforroutingupdatesinswitched
environments.
B.Itisusedtopreventroutingloopsinnetworkswithredundantroutes.
C.Itisusedtopreventswitchingloopsinnetworkswithredundantswitched
routes.
D.Itisusedtomanage,theaddition,deletion,andnamingofVLANsacross
multipleswitches.
E.Itisusedtosegmentanetworkintomultiplecollisiondomains.
F.Noneoftheabove.
G.AlloftheabovearefunctionsofSTP.
正確答案:C
C解析:Explanation:
Toavoidloops,allbridgingdevices,includingswitches,useSTP.STPcauseseach
interfaceonabridgingdevicetosettleintoablockingstateoraforwardingstate.
Blockingmeansthattheinterfacecannotforwardorreceivedataframes.
Forwardingmeansthattheinterfacecansendandreceivedataframes.Byhaving
acorrectsubsetoftheinterfacesblocked,asinglecurrentlyactivelogicalpath
willexistbetweeneachpairofLANs.STPresidesatthedatalinklayer,soitis
usedtopreventloopswithinaswitchednetwork.Itisnotusedtopreventrouting
loops;thatisthefunctionofthemechanismswithnaroutingprotocol.
當拓撲信息完成交換,相鄰路由器具有相同的LSDB時,下列哪項OSPF鄰居
狀態(tài)是希望得到的()
A.2-WAY
B.FULL
C.Exchange
0.Loading
正確答案:B
關于PPP和HDLC的說法中,錯誤的是()
A.PPP是通用協(xié)議,HDLC是CISCO私有協(xié)議
B.PPP有驗證功能,HDLC無驗證功能
C.PPP效率低,HDLC效率高
D.在配置ISDN時,廣域網(wǎng)協(xié)議不能封裝成PPP,但可以封裝成HDLC
正確答案:D
關于靜態(tài)NAT,下面()說法是正確的。
A.靜態(tài)NAT轉(zhuǎn)換在缺省情況下24小時后超時
B.靜態(tài)NAT轉(zhuǎn)換從地址池中分配
C.靜態(tài)NAT將內(nèi)部地址一對一靜態(tài)映射到內(nèi)部全局地址
D.CISCO路由器缺省使用了靜態(tài)NAT
正確答案:C
CDPisbeingusedthroughouttheEzonexamnetwork.Whataretworeasons
whytheEzonexamnetworkadministratorwoulduseCDP?(Choosetwo)
A.Todeterminethestatusofnetworkservicesonaremotedevice
B.ToobtaintheIPAddressofaconnecteddeviceinordertotelnettothe
device
C.Toverifythetypeofcableinterconnectingtwodevices
D.ToverifyLayer2connectivitybetweentwodeviceswhenLayer3fails
E.ToobtainVLANinformationfromdirectlyconnectedswticehs
F.Todeterminethestatusoftheroutingprotocolsbetweendirectly
connectedrouters
G.Tosupportautomaticnetworkfailoverduringoutages
正確答案:BD
B,D
2021思科認證考試真題6節(jié)第6節(jié)
Ezonexamusershavenoticedextremelyslownetworkperformance,
intermittentconnectivity,andconnectionlosses.Afterenteringthe"show
interfaces"command,younoticethattheEthernetinterfaceisconfiguredas100
Mbpsfull-duplexandthatthereisevidenceoflatecollisions.Whatcouldbethe
causeofthisproblem?
A.Duplexmismatch
B.Aroutingloop
C.Trunkingmodemismatch
D.Improperlyconfiguredrootbridge
E.ImproperlyconfiguredstaticVLAN
F.Noneoftheabove
正確答案:A
A解析:Explanation:
Aduplexmismatchmayresultinperformanceissues,intermittentconnectivity,
andlossofcommunication.WhentroubleshootingNICissues,verifythattheNIC
andswitchareusingavalidconfiguration.Somethird-partyNICcardsmayfall
backtohalf-duplexoperationmode,eventhoughboththeswitchportandNIC
configurationhavebeenmanuallyconfiguredfor100Mbps,full-duplex.
Thisbehavior,isduetothefactthatNICautonegotiationlinkdetectionisstil
operatingwhentheNIChasbeenmanuallyconfigured.Thiscausesduplex
inconsistencybetweentheswitchportandtheNIC.Symptomsincludepoorport
performanceandframe,checksequence(FCS)errorsthatincrementonthe
switchport.
Totroubleshootthisissue,trymanuallyconfiguringtheswitchportto100Mbps,
half-duplex.Ifthisactionresolvestheconnectivityproblems,youmayberunning
intothisNICissue.TryupdatingtothelatestdriversforyourNIC,orcontactyour
NICcardvendorforadditionalsupport.
擴展ACL和標準ACL的區(qū)別(),
A.標準的ACL在禁止和允許方面比擴展的ACL更高的精度
B.擴展的ACL核查數(shù)據(jù)包的源地址和目標地址和端口號
C他們都可以查端口號
D.他們都可以查特殊協(xié)議和其他參數(shù)
正確答案:B
StudytheExhibitbelowcarefully:
London#showvtp
VTPVersion:2
ConfigurationRevision:0
MaximumVLANssupportedlocally:64
NumberofexistingVLANs:5
VTPOperatingMode:Client
VTPDomainName:London
VTPPruningMode:Disabled
VTPV2Mode:Disabled
VTPTrapsGeneration
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