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2023年思科認證考試歷年難點與易錯點考核試題答案解析預(yù)祝考試順利!第1套一.綜合考試題庫(共25題)1.[多選題]Whyisfull-duplexEthernetsuperiortoitssingle-duplexcounterpart?(Selecttwoanswerchoices.)
A.Itusesinexpensivehubs
B.Itoperateswithoutcollisions
C.Itoperatesonswitches
D.Itprovidesfasterdatatransfer
E.Itutilizesfewerwiringpairs
正確答案:BD
ItoperateswithoutcollisionsItprovidesfasterdatatransfer
解析:解析:Explanation:
2.[單選題]OSI七層模型中,“段”是哪一層數(shù)據(jù)封裝的名稱()
A.物理層
B.數(shù)據(jù)鏈路層(datalinklayer)
C.網(wǎng)絡(luò)層
D.傳輸層
正確答案:D
傳輸層
解析:D
3.[單選題]對于使用鏈路狀態(tài)路由協(xié)議的路由器如何選擇最佳路線到達子網(wǎng),下列哪項是正確的()
A.路由器會發(fā)現(xiàn)鏈路狀態(tài)數(shù)據(jù)庫中的最佳路由
B.通過針對鏈路狀態(tài)數(shù)據(jù)庫中的信息運行SPF算法,路由器會計算出最佳路由
C.路由器將比較每個鄰居接收到的更新中為子網(wǎng)列出的標(biāo)準,并挑選最佳標(biāo)準路由
D.路由器會使用具有最低條數(shù)的路徑
正確答案:B
通過針對鏈路狀態(tài)數(shù)據(jù)庫中的信息運行SPF算法,路由器會計算出最佳路由
解析:B
4.[單選題]命令“ping”的功能是()
A.測試網(wǎng)卡是否正常
B.測試網(wǎng)關(guān)是否正常
C.測試TCP/IP協(xié)議是否正常
D.測試介質(zhì)是否正常
正確答案:C
測試TCP/IP協(xié)議是否正常
解析:C
5.[單選題]查看E0端口配置信息的命令是:()
A.showaccess-list
B.showiproute
C.showversion
D.showinterfacee0
正確答案:D
showinterfacee0
解析:D
6.[多選題]TwostationsontheEzonexamLANtransmitatthesametime,resultinginacollision.Whathappenswhenacollisionoccursonthenetwork?(Chooseallthatapply)
A.EachdeviceontheEthernetsegmentstopstransmittingforashorttime.
B.Ajamsignalinformsalldevicesthatacollisionoccurred.
C.Whendatatransmissionresumes,thedevicesthatwereinvolvedinthecollisionhaveprioritytotransmit.
D.Thedevicesthatareinvolvedinthecollisionstopstransmittingforashorttime.
E.Thecollisioninvokesarandomback-offalgorithm.
正確答案:BDE
Ajamsignalinformsalldevicesthatacollisionoccurred.Thedevicesthatareinvolvedinthecollisionstopstransmittingforashorttime.Thecollisioninvokesarandomback-offalgorithm.
解析:解析:Explanation:
7.[單選題]NAT可以被用于完成多種功能,以下不屬于其功能的是:()
A.轉(zhuǎn)換內(nèi)部局部地址
B.內(nèi)部全局地址復(fù)用
C.TCP負載均衡
D.內(nèi)部網(wǎng)絡(luò)流量控制
正確答案:D
內(nèi)部網(wǎng)絡(luò)流量控制
解析:D
8.[多選題]AsaEzonexamtraineeyouarerequiredtosetthedefaultgatewayonaCiscoswitchtotheIPaddressof15.WhichIOScommandshouldyouuse?
A.TestKSwitch(config)iproute-default15
B.TestKSwitch(config)ipdefault-gateway15
C.TestKSwitch(config)iproute15
D.TestKSwitch(config)ipdefault-network15
E.Noneoftheabove
正確答案:ABCD
TestKSwitch(config)iproute-default15TestKSwitch(config)ipdefault-gateway15TestKSwitch(config)iproute15TestKSwitch(config)ipdefault-network15
解析:解析:Explanation:
9.[單選題]常見的LSA有幾種類型()
A.4
B.5
C.6
D.7
正確答案:C
6
解析:C
10.[單選題]YouneedtodecideonwhichtrunkingmethodtoimplementintheEzonexamnetwork.WhatisacharacteristicofISLand802.1qframe.tagginginaswitchedLANenvironment?
A.Theyareusedtofindthebestpaththroughanetwork.
B.Theyallowtheexchangeoffilteringtables.
C.TheyspecifydifferentimplementationsoftheSpanning-TreeProtocol.
D.Theyallowtheexchangeofroutingtables
E.Theyprovideinter-switchVLANcommunication.
正確答案:E
Theyprovideinter-switchVLANcommunication.
解析:解析:Explanation:AtrunklinkistheothertypeofLayer2portsupportedonCiscoswitches.Whenatrunkportisconfigured,itbeginsmarkingframesastheyexittheporttoindicatewhichVLANeachframe.isassociatedwith.
11.[單選題]交換機轉(zhuǎn)發(fā)數(shù)據(jù)到目的地依靠()
A.路由表
B.MAC地址表
C.訪問權(quán)限表
D.靜態(tài)列表
正確答案:B
MAC地址表
解析:B
12.[單選題]關(guān)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(highefficiency)
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
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
解析:D
13.[多選題]WithregardtoEthernetmediaaccessmethods,whichofthefollowingaretrue?(Chooseallthatapply.)
A.Adevicewaitsforanelectronicsignalbeforetransmitting.
B.Adevicelistensandwaitsuntilthemediaisnotbusybeforetransmitting.
C.AlldevicesonanEthernetsegmentseedatathatpassesonthenetworkmedium.
D.Onlythesenderandthereceiverdevicesseedatathatpassesonthenetworkmedium.
E.Ethernetnetworksallowyoutoconfigureddeviseswithhighertransmissionpriority.
正確答案:BC
Adevicelistensandwaitsuntilthemediaisnotbusybeforetransmitting.AlldevicesonanEthernetsegmentseedatathatpassesonthenetworkmedium.
解析:解析:Explanation:
14.[多選題]HowcouldtheEzonexamcorporationbenefitfromusingVLANsontheirnetwork?(Selectthreeanswerchoices.)
A.VLANsallowaccesstonetworkservicesbasedondepartment,notphysicallocation.
B.VLANsutilizepacketfilteringtoenhancenetworksecurity.
C.VLANsprovidealow-latency,highbandwidthinternetworkingalternative.
D.VLANsprovideamethodofcommunicationbetweenIPaddressesinlargenetworks.
E.VLANsestablishsegmentedbroadcastdomainsinswitchednetworks.
F.F.VLANscangreatlysimplifyadding,moving,orchanginghostsonthenetwork.
正確答案:AE
VLANsallowaccesstonetworkservicesbasedondepartment,notphysicallocation.VLANsestablishsegmentedbroadcastdomainsinswitchednetworks.
解析:A,E,F解析:Explanation:
15.[單選題]RIP路由協(xié)議認為“網(wǎng)絡(luò)不可到達”的跳數(shù)是:()
A.8
B.16
C.24
D.100
正確答案:B
16
解析:B
16.[單選題]“ipaccess-group”命令在接口上缺省的應(yīng)用方向是什么"()。
A.in
B.具體取決于接口應(yīng)用哪個訪問控制列表
C.out
D.無缺省值
正確答案:C
out
解析:C
17.[單選題]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
EIGRP
解析:C
18.[單選題]Anadministratorissuestheshowipinterfaces0/0commandandtheoutputdisplaysthatinterfaceSerial0/0isup,lineprotocolisup.Whatdoes"lineprotocolisup"specificallyindicateabouttheinterface?
A.Thecableisattachedproperly.
B.CDPhasdiscoveredtheconnecteddevice.
C.Keepalivesarebeingreceivedontheinterface.
D.Acarrierdetectsignalhasbeenreceivedfromtheconnecteddevice.
E.IPiscorrectlyconfiguredontheinterface.
正確答案:C
Keepalivesarebeingreceivedontheinterface.
解析:解析:Explanation:
19.[單選題]AfterconnectingaPCtoanavailableportonaswitch,youfindthatthePCcannotaccessanyoftheresourcesontheLAN.NootherPC'sconnectedtotheswitchappeartobehavinganyissues.Whatisthemostlikelycauseforthisproblem?
A.Therouterlacksaroutingtableentryforthenewhost
B.ThehostswitchportisassignedtotheincorrectVLAN
C.ThehostMACaddressisincorrectlyconfigured
D.ASTPinstanceforthenewhosthasnotbeeninitialized
E.TheswitchdoesnothavetheMACaddresshardcodedintheCAMtable.
正確答案:B
ThehostswitchportisassignedtotheincorrectVLAN
解析:解析:Explanation:VirtualLANsbreakupbroadcastdomainsinalayer-twoswitchedinternetwork.IfahostisinadifferentVLANthenthenetworkservicesitneedstouse,thepacketsmustgothrougharouter.Ifroutingdoesnottakeplace,thePCwillbeunabletocommunicatewithanyotherdevicesnotinthesameVLAN.AnswerBisthebestanswerforthisquestion.IncorrectAnswers:A.ThePCisunabletocommunicatewithotherLANusers.Norouterneedstoevenbeinstalledforthistowork.C,E.TheMACaddressofthePCdoesnotneedtobeenteredmanuallyintotheswitch.TheswitchwilldynamicallylearnoftheMACaddressofthePC.D.TheSTPalgorithmdoesnotneedtohaveanyendhostinformationaddedinorderforittowork.
20.[單選題]標(biāo)準訪問控制列表的數(shù)字標(biāo)識范圍是()。
A.1-50
B.1-99
C.1-100
D.1-199
正確答案:B
1-99
解析:B
21.[多選題]請選出交換機處理幀的三種模式:()
A.直通模式
B.存儲轉(zhuǎn)發(fā)模式
C.偵測模式
D.分段模式
E.阻塞模式
正確答案:ABE
直通模式存儲轉(zhuǎn)發(fā)模式阻塞模式
解析:ABE
22.[單選題]兩臺路由器直連到一起,應(yīng)該使用的線纜為()
A.交叉線纜
B.直通線纜
C.反轉(zhuǎn)線纜
D.任意線纜
正確答案:A
交叉線纜
解析:A
23.[單選題]為了阻止交換機環(huán)路,交換機上所采用的技術(shù)為()
A.水平分割
B.生成樹協(xié)議
C.觸發(fā)更新
D.地址學(xué)習(xí)
正確答案:B
生成樹協(xié)議
解析:B
24.[單選題]RIP協(xié)議的管理距離是()
A.100
B.110
C.120
D.150
正確答案:B
110
解析:B
25.[單選題]關(guān)于OSPF中DR的說法不正確的是()
A.通過hello報文選舉DR
B.如果某路由器優(yōu)先級比DR優(yōu)先級高,但啟動晚,它會搶占原來的DR自己成為DR
C.一個廣播類型網(wǎng)絡(luò)中只能有一個DR
D.一旦DR失效,BDR接替DR的工作,并重新選舉一個BDR
正確答案:B
如果某路由器優(yōu)先級比DR優(yōu)先級高,但啟動晚,它會搶占原來的DR自己成為DR
解析:B
第2套一.綜合考試題庫(共25題)1.[單選題]TheIPnetworkissubnettedusinga/24mask.Howmanyusablenetworksandhostaddressescanbeobtainedfromthis?
A.1networkwith254hosts
B.4networkswith128hosts
C.2networkswith24hosts
D.6networkswith64hosts
E.8networkswith36hosts
正確答案:A
1networkwith254hosts
解析:解析:Explanation:Asubnetwith24bitsonwouldbe.SincethisisaclassCnetwork,thissubnetcanhaveonly1networkand254usablehosts.
2.[單選題]哪個ACL可允許主機0訪問web服務(wù)器44()
A.access-list101permittcphost0eq80host24
B.access-list101permittcp0host24eq80
C.access-list101permithost0host24eq80
D.access-list101permittcp0host24eq80
正確答案:D
access-list101permittcp0host24eq80
解析:D
3.[單選題]TheEzonexamcorporateLANconsistsofonelargeflatnetwork.YoudecidetosegmentthisLANintotwoseparatenetworkswitharouter.Whatwillbetheaffectofthischange?
A.Thenumberofbroadcastdomainswillbedecreased.
B.Itwillmakethebroadcastingoftrafficbetweendomainsmoreefficientbetweensegments.
C.Itwillincreasethenumberofcollisions.
D.Itwillpreventsegment1'sbroadcastsfromgettingtosegment2.
E.Itwillconnectsegment1'sbroadcaststosegment2.
正確答案:D
Itwillpreventsegment1'sbroadcastsfromgettingtosegment2.
解析:解析:Explanation
4.[單選題]Thenetworkissubnettedusinga/26mask.HowmanynetworksandIPhostspernetworkexistsusingthissubnetmask?
A.4networksand64hosts
B.64networksand4hosts
C.4networksand62hosts
D.62networksand2hosts
E.6networkand30hosts
正確答案:C
4networksand62hosts
解析:解析:Explanation:
5.[單選題]基本IP訪問權(quán)限表的表號范圍是:()
A.1—100
B.1-99
C.100-199
D.800-899
正確答案:B
1-99
解析:B
6.[多選題]Youneedtodescribethevarioustypesofflowcontroltoyourco-workers.Whichofthefollowingaretypesofflowcontrolthatcanbeusedinanetwork?(Choosethree)
A.Congestionavoidance
B.Windowing
C.Cut-through
D.Buffering
E.LoadBalacing
F.F.FastForward
正確答案:ABD
CongestionavoidanceWindowingBuffering
解析:A,B,D
7.[單選題]Whatisthepurposeofthespanning-treealgorithminaswitchedLAN?
A.Toprovideamonitoringmechanismfornetworksinswitchedenvironments.
B.TomanageVLANsacrossmultipleswitches.
C.Topreventswitchingloopsinnetworkswithredundantswitchedpaths.
D.Tosegmentanetworkintomultiplecollisiondomains.
E.Topreventroutingloopsinnetworks.
正確答案:C
Topreventswitchingloopsinnetworkswithredundantswitchedpaths.
解析:解析:Explanation:STPisusedinLANswithredundantpathsorroutestopreventloopsinalayer2switchedorbridgedLAN.IncorrectAnswers:A,B:TheprimarypurposeofSTPistopreventloops,notformonitoringormanagementofswitchesorVLANs.D.VLANsareusedtosegmentaLANintomultiplecollisiondomains,buttheSTPprocessalonedoesnotdothis.E.Routersareusedtopreventroutingloopsatlayer3oftheOSImodel.STPoperatesatlayer2.
8.[單選題]把訪問權(quán)限表應(yīng)用到路由器端口的命令是:()
A.permitaccess-list101out
B.ipaccess-group101out
C.applyaccess-list101out
D.access-class101out
正確答案:B
ipaccess-group101out
解析:B
9.[單選題]下面有關(guān)交換機的描述中,正確的是()
A.所有交換機都支持VLAN功能
B.交換機端口數(shù)量最多為48口
C.交換機獨占帶寬
D.交換機端口的最大速率為100Mbit/s
正確答案:C
交換機獨占帶寬
解析:C
10.[單選題]路由器上的命令“showversion”的功能是()
A.顯示版本信息
B.顯示端口配置信息
C.顯示路由表
D.顯示路由協(xié)議信息
正確答案:A
顯示版本信息
解析:A
11.[單選題]SMTP工作在OSI哪一層()
A.會話層
B.表示層
C.傳輸層
D.應(yīng)用層
正確答案:D
應(yīng)用層
解析:D
12.[單選題]Whiletroubleshootingaconnectivityproblemonthenetwork,youissuethepingcommandfromyourPCcommandprompt,buttheoutputshows"requesttimesout."AtwhichOSIlayeristhisproblemassociatedwith?
A.Thedatalinklayer
B.Theapplicationlayer
C.Theaccesslayer
D.Thesessionlayer
E.Thenetworklayer
正確答案:E
Thenetworklayer
解析:解析:Explanation:
13.[單選題]Duringthebootsequence,aEzonexam2800seriesrouterneedstolocateandloadanoperatingsystem.Whatisthedefaultordertherouterusestofindanoperatingsystem?
A.ROM,TFTPserver,Flash
B.Flash,TFTPserver,ROM
C.Flash,NVRAM,TFTPserver
D.Flash,ROM,TFTPserver
E.Flash,TFTPserver,RAM
正確答案:B
Flash,TFTPserver,ROM
解析:解析:Explanation:BootinguptheRouter:CiscorouterscanbootCiscoIOSsoftwarefromtheselocations:1.Flashmemory2.TFTPserver3.ROM(notfullCiscoIOS)Multiplesourceoptionsprovideflexibilityandfallbackalternatives.
14.[多選題]WhichofthefollowingstepsarenecessaryinordertoaddanewVLANtotheEzonexamswitchednetwork?(Selectallthatapply)
A.CreatetheVLAN.
B.NametheVLAN.
C.ConfigureanIPaddressfortheVLAN.
D.AddthedesiredportstothenewVLAN.
E.AddtheVLANtotheVTPdomain.
正確答案:ABD
CreatetheVLAN.NametheVLAN.AddthedesiredportstothenewVLAN.
解析:解析:Explanation:
15.[單選題]幀中繼(framerelay)環(huán)境下,為了區(qū)分虛電路,應(yīng)該使用的地址是()
A.IP地址
B.MAC地址
C.DLCI
D.IPX地址
正確答案:C
DLCI
解析:C
16.[單選題]在啟用IGRP協(xié)議時,所需要的參數(shù)是:()
A.網(wǎng)絡(luò)掩碼
B.子網(wǎng)號
C.自治系統(tǒng)號
D.跳數(shù)
正確答案:C
自治系統(tǒng)號
解析:C
17.[單選題]AnewEzonexamswitchisinstalledintoanexistingLANandanewVTPtrunkissetupwithanexistingswitch.WhichVLANswillbeallowedonthisnewtrunk?
A.AlldefinedVLANsareallowedonthetrunkbydefault.
B.EachVLAN,orVLANrange,thatisspecifiedwiththeswitchportmodecommand.
C.EachVLAN,orVLANrange,thatisspecifiedwiththevtpdomaincommand.
D.EachVLAN,orVLANrange,thatisspecifiedwiththevlandatabasecommand.
E.Noneoftheabove
正確答案:A
AlldefinedVLANsareallowedonthetrunkbydefault.
解析:解析:Explanation:
18.[單選題]當(dāng)在一個接口上使用ipaccess-group99in命令時,以下哪條關(guān)于所引用訪問控制列表的描述是正確的()
A.這個列表是編號型擴展ACL,檢查離開接口的數(shù)據(jù)包
B.這個列表是命名的擴展ACL,檢查進入接口的數(shù)據(jù)包
C.這個列表是編號型標(biāo)準ACL,檢查進入接口的數(shù)據(jù)包
D.這個列表是命名的標(biāo)準ACL,檢查離開接口的數(shù)據(jù)包
正確答案:C
這個列表是編號型標(biāo)準ACL,檢查進入接口的數(shù)據(jù)包
解析:C
19.[單選題]下列關(guān)于路由器和交換機的描述中,錯誤的是()
A.路由器可以用來連接internet
B.二層交換機可以用來實現(xiàn)“異地網(wǎng)絡(luò)”互連
C.路由器可以用來做路徑選擇
D.交換機可以轉(zhuǎn)發(fā)廣播
正確答案:D
交換機可以轉(zhuǎn)發(fā)廣播
解析:D
20.[多選題]網(wǎng)絡(luò)中經(jīng)常使用“幀中繼”服務(wù),請選出幀中繼的優(yōu)點()
A.偷占帶寬
B.提供擁塞管理機制
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:ABD
偷占帶寬提供擁塞管理機制靈活的接入方式
解析:ABD
21.[單選題]路由器“路由模式”的提示符號是()
B.(config)
C.(config-if)
D.(config-router)
正確答案:D
(config-router)
解析:D
22.[單選題]Assumingyoubuildnetworkstoexactspecifications,whatistherecommendedmaximumlengtha10BaseTcablecanbebeforeithastobesegmentedorrepeated?
A.100meters
B.100feet
C.100yards
D.200meters
E.Noneoftheabove
正確答案:A
100meters
解析:解析:Explanation:
23.[多選題]AstheEzonexamnetworkadministrator,youarerequiredtohaveafirmunderstandingoftheOSImodel.WhydoesthedatacommunicationindustryusethelayeredOSIreferencemodel?(Choosetwo)
A.Itenablesequipmentfromdifferentvendorstousethesameelectroniccomponents,thussavingresearchanddevelopmentfunds
B.Itencouragesindustrystandardizationbydefiningwhatfunctionsoccurateachlayerofthemodel
C.Itdividesthenetworkcommunicationprocessintosmallerandsimplercomponents;thusaidingcomponentdevelopment,designandtroubleshooting
D.Itprovidesameansbywhichchangesinfunctionalityinonelayerrequirechangesinotherlayers
E.Itsupportstheevolutionofmultiplecompetingstandardsandthusprovidesbusinessopportunitiesforequipmentmanufacturers
正確答案:BC
ItencouragesindustrystandardizationbydefiningwhatfunctionsoccurateachlayerofthemodelItdividesthenetworkcommunicationprocessintosmallerandsimplercomponents;thusaidingcomponentdevelopment,designandtroubleshooting
解析:解析:Explanation:
24.[單選題]配置路由器時,封裝PPP協(xié)議的命令是:()
A.encapppp
B.ppp
C.groupppp
D.intppp
正確答案:A
encapppp
解析:A
25.[單選題]關(guān)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
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
解析:C
第3套一.綜合考試題庫(共25題)1.[單選題]OSI七層模型中,網(wǎng)絡(luò)層的數(shù)據(jù)封裝名稱為()
A.比特
B.幀
C.包
D.段
正確答案:C
包
解析:C
2.[單選題]路由表中,某條路由的“路由代碼為D”,則表明該路由為()
A.直連路由
B.靜態(tài)路由
C.IGRP路由
D.EIGRP路由
正確答案:D
EIGRP路由
解析:D
3.[單選題]在路由表中到達同一網(wǎng)絡(luò)的路由有:靜態(tài)路由、RIP路由、IGRP路由,OSPF路由,則路由器會選用哪條路由傳輸數(shù)據(jù):()
A.靜態(tài)路由
B.RIP路由
C.IGRP路由
D.OSPF路由
正確答案:A
靜態(tài)路由
解析:A
4.[單選題]YouhaveaclassCnetwork,andyouneedtodesignitfor5usablesubnetswitheachsubnethandlingaminimumof18hostseach.Whichofthefollowingnetworkmasksshouldyouuse?
A..
B..
C..
D.24
E.40
正確答案:D
24
解析:解析:Explanation:ThedefaultsubnetmaskforclassCnetworkis.Ifonehastocreate5subnets,then3bitsarerequired.With3bitswecancreate8subnets.Theremaining5bitsareusedforHosts.Onecancreate30hostsusing5bitsinhostfield.Thismatcheswiththerequirement.IncorrectAnswers:A,B:ThisisanillegalsubnetmaskforaclassCnetwork,asthethirdoctetcannotbedividedwhenusingaclassCnetwork.C:ThisisthedefaultsubnetmaskforaclassCnetwork.Itprovidesforonenetwork,with254usablehostIPaddresses.E:Thissubnetmaskwillprovidefor14separatenetworkswith14hostseach.Thisdoesnotmeettherequirementofaminimumof18hosts.
5.[單選題]介質(zhì)100BaseT的最大傳輸距離是:()
A.10m
B.100m
C.1000m
D.500m
正確答案:B
100m
解析:B
6.[單選題]下列命令中,無法正確執(zhí)行的是()
A.Router(config)showrun
B.Routerping
C.Router(config)hostnamecisco
D.Routerreload
正確答案:A
Router(config)showrun
解析:A
7.[多選題]Regardingtheextendedpingcommand;whichofthestatementsbelowaretrue?(Selectallvalidanswerchoices)
A.TheextendedpingcommandissupportedfromuserEXECmode.
B.TheextendedpingcommandisavailablefromprivilegedEXECmode.
C.WiththeextendedpingcommandyoucanspecifytheTCPandUDPporttobepinged.
D.Withtheextendedpingcommandyoucanspecifythetimeoutvalue.
E.Withtheextendedpingcommandyoucanspecifythedatagramsize.
正確答案:BDE
TheextendedpingcommandisavailablefromprivilegedEXECmode.Withtheextendedpingcommandyoucanspecifythetimeoutvalue.Withtheextendedpingcommandyoucanspecifythedatagramsize.
解析:解析:Explanation:
8.[單選題]IP地址為:0,掩碼為:48,則該IP地址所在子網(wǎng)的子網(wǎng)號為()
A.2
B.4
C.6
D.1
正確答案:B
4
解析:B
9.[單選題]哪個命令可以成功測試網(wǎng)絡(luò):()
A.Router>ping
B.Routerping0
C.Router>ping56
D.Routerping55
正確答案:B
Routerping0
解析:B
10.[單選題]FTP工作在OSI哪一層()
A.會話層(sessionlayer)
B.表示層
C.傳輸層
D.應(yīng)用層
正確答案:D
應(yīng)用層
解析:D
11.[單選題]為了連接“幀中繼”線路,網(wǎng)絡(luò)中的路由器需要提供的端口類型為()
A.FastEthernet
B.Serial
C.BRI
D.Ethernet
正確答案:B
Serial
解析:B
12.[單選題]在地址轉(zhuǎn)換中,()用來規(guī)定哪些數(shù)據(jù)包需要進行地址轉(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
訪問控制列表
解析:B
13.[單選題]下面哪個操作可以使訪問控制列表真正生效()。
A.將訪問控制列表應(yīng)用到接口上
B.定義擴展訪問控制列表
C.定義多條訪問控制列表的組合
D.用access-list命令配置訪問控制列表
正確答案:A
將訪問控制列表應(yīng)用到接口上
解析:A
14.[多選題]網(wǎng)絡(luò)中經(jīng)常使用DDN服務(wù),請選出DDN的優(yōu)點()
A.傳輸質(zhì)量高
B.接入方式靈活
C.偷占帶寬
D.使用虛電路
E.專用線路
正確答案:ADE
傳輸質(zhì)量高使用虛電路專用線路
解析:ADE
15.[多選題]屬于私有IP段的是()
A.-55
B.-55
C.-55
D.-55
E.-55
正確答案:ABD
-55-55-55
解析:ABD
16.[單選題]路由器下“特權(quán)用戶模式”的標(biāo)識符是:()
A.>
B.!
C.
D.(config-if)
正確答案:C
解析:C
17.[單選題]工作在OSI第三層(layer3)的設(shè)備是:()
A.網(wǎng)卡
B.路由器
C.交換機
D.集線器
正確答案:B
路由器
解析:B
18.[單選題]IP地址為:0,掩碼為:48,則該IP地址所在子網(wǎng)的子網(wǎng)有效IP為()
A.3---9
B.1---0
C.5---0
D.6---5
正確答案:C
5---0
解析:C
19.[單選題]網(wǎng)關(guān)的功能()
A.過濾數(shù)據(jù)包
B.不同網(wǎng)段通信
C.校驗數(shù)據(jù)幀
D.把數(shù)據(jù)封裝成“段”
正確答案:B
不同網(wǎng)段通信
解析:B
20.[單選題]Afterloggingintoarouterandtypinginafewshowcommands,youpresstheuparrowkey.Whatwillthisdo?
A.Itwillrecallthepreviouscommandline
B.Itwillmovethecursoronelineup
C.Itwillredisplaythecurrentcommandline
D.Itwillcapitalizethecommandline
E.Noneoftheabove
正確答案:A
Itwillrecallthepreviouscommandline
解析:解析:Explanation:
21.[單選題]YouwanttoupgradetheEzonexamLANsothatallportsoperateinfullduplexmode.Whichstatementistrueaboutfull-duplexEthernetwhencomparingtohalf-duplexEthernet?
A.Full-duplexEthernetconsistsofasharedcablesegment.Half-duplexprovidesapoint-to-pointlink
B.Full-duplexEthernetusestwowirestosendandreceive.Half-duplexEthernetusesonewiretosendandreceive
C.Full-duplexEthernetcanprovidehigherthroughputthancanhalf-duplexEthernetofthesamebandwidth
D.Full-duplexEthernetusesaloopbackcircuittodetectcollisions.Half-duplexEthernetusesajamsignal
E.Noneoftheabove
正確答案:C
Full-duplexEthernetcanprovidehigherthroughputthancanhalf-duplexEthernetofthesamebandwidth
解析:C
22.[單選題]Onahalf-duplexEthernetLAN,twohostsattempttosenddatasimultaneously,resultinginacollision.Followingthiscollision,whatwillthehostsdo?(Selectallvalidanswers)
A.Thedestinationhostsendsarequesttothesourceforretransmission.
B.Thejamsignalindicatesthatthecollisionhasbeencleared.
C.Thehostswillattempttoresumetransmissionafteratimedelayhasexpired.
D.Anelectricalpulseindicatesthatthecollisionhascleared.
E.Therouteronthesegmentwillsignalthatthecollisionhascleared.
F.F.Thehostswilldonothing,asthehigherlayersareresponsiblefordataerrorcorrectionandre-transmission.
正確答案:C
Thehostswillattempttoresumetransmissionafteratimedelayhasexpired.
解析:C解析:Explanation:
23.[單選題]路由器“全局模式”的提示符為()
A.>
C.(config)
D.(config-router)
正確答案:C
(config)
解析:C
24.[單選題]對于路由表,下列說法中正確的是:()
A.在缺省的情況下,如果一臺路由器同時運行了RIP和OSPF兩種動態(tài)路由協(xié)議,則在路由表中只會顯示RIP發(fā)現(xiàn)的路由,因為RIP協(xié)議的優(yōu)先級更高
B.在缺省的情況下,如果一臺路由器同時運行了RIP和OSPF兩種動態(tài)路由協(xié)議,則在路由表中只會顯示OSPF發(fā)現(xiàn)的路由,因為OSPF協(xié)議的優(yōu)先級更高
C.在缺省的情況下,如果一臺路由器同時運行了RIP和OSPF兩種動態(tài)路由協(xié)議,則在路由表中只會顯示RIP發(fā)現(xiàn)的路由,因為RIP協(xié)議的花費值(metric)更小
D.在缺省的情況下,如果一臺路由器同時運行了RIP和OSPF兩種動態(tài)路由協(xié)議,則在路由表中只會顯示OSPF發(fā)現(xiàn)的路由,因為OSPF協(xié)議的花費值(metric)更小
正確答案:B
在缺省的情況下,如果一臺路由器同時運行了RIP和OSPF兩種動態(tài)路由協(xié)議,則在路由表中只會顯示OSPF發(fā)現(xiàn)的路由,因為OSPF協(xié)議的優(yōu)先級更高
解析:B
25.[單選題]兩個VLAN之間要想通信,應(yīng)該使用的設(shè)備是()
A.集線器
B.二層交換機
C.路由器
D.PC機
正確答案:C
路由器
解析:C
第4套一.綜合考試題庫(共25題)1.[單選題]在路由器上,命令showaccess-list的功能是()
A.顯示訪問控制列表內(nèi)容
B.顯示路由表內(nèi)容
C.顯示端口配置信息
D.顯示活動配置文件
正確答案:A
顯示訪問控制列表內(nèi)容
解析:A
2.[單選題]WhichtypeofcableshouldbeusedtomakeaconnectionbetweentheFa0/0portonarouterandtheFa0/0portswitch?
A.Rollovercable
B.Consolecable
C.Crossovercable
D.Straight-throughcable
E.Serialcable
正確答案:D
Straight-throughcable
解析:解析:Explanation:Straight-throughcablesareusedtoconnecthosttoswitch(orhub)androutertoswitch(orhub).
3.[多選題]Usingasubnetmaskof24,whichoftheIPaddressesbelowcanyouassigntothehostsonthissubnet?(Selectallthatapply)
A.3
B.59
C.3
D.6
E.7
F.F.92
正確答案:CDE
367
解析:C,D,E解析:Explanation:
4.[單選題]TELNET工作在OSI哪一層()
A.會話層(sessionlayer)
B.表示層
C.傳輸層
D.應(yīng)用層
正確答案:D
應(yīng)用層
解析:D
5.[多選題]TheLANneedsareexpandingattheEzonexamcorporateoffice,whichisquicklygrowing.YouareinstructedtoenlargetheareacoveredbyasingleLANsegmentontheEzonexamnetwork.Whichofthefollowingarelayer1devicesthatyoucanuse?(Chooseallthatapply.)
A.Aswitch
B.Arouter
C.Anetworkadaptercard
D.Ahub
E.Arepeater
正確答案:DE
AhubArepeater
解析:解析:Explanation:
6.[單選題]為了禁止網(wǎng)絡(luò)ftp到網(wǎng)絡(luò),允許其他信息傳輸,則能實現(xiàn)該功能的選項是:()
A.access-list1deny..0
B.access-list100denytcp5555eqftp
C.access-list100permitipanyany
D.access-list100denytcp5555eqftpaccesslist100permitipanyany
正確答案:D
access-list100denytcp5555eqftpaccesslist100permitipanyany
解析:D
7.[單選題]下面對Cisco2621路由器和Cisco2501路由器描述中,錯誤的是()
A.Cisco2621路由器的可擴展性優(yōu)于Cisco2501路由器
B.Cisco2621是模塊化路由器(modulerouter)
C.Cisco2501上提供一個100Mbit/s的快速以太網(wǎng)(ethernet)端口
D.Cisco2501是固定端口的路由器
正確答案:C
Cisco2501上提供一個100Mbit/s的快速以太網(wǎng)端口
解析:C
8.[單選題]YouareanadministratoroftheEzonexamswitchednetworkandyourgoalistoreducesomeoftheadministrativeoverheadonyournetwork.YouplanonachievingthisbyconfiguringanewVLANforeachdepartmentintheEzonexamnetwork.However,youneedtosharetheVLANinformationacrossnumerousswitches.Whichofthefollowingwouldallowyouaccomplishthis?
A.STP
B.GVRP
C.SNMP
D.VTP
E.DHCP
F.F.Noneoftheabove
正確答案:D
VTP
解析:D解析:Explanation:
9.[單選題]幀中繼環(huán)境中,在物理端口上,建立子接口的命令是()
A.create
B.interface
C.encapsulation
D.ipaddress
正確答案:B
interface
解析:B
10.[多選題]YouneedtoconfigureadefaultrouteonaEzonexamrouter.Whichcommandwillconfigureadefaultrouteonarouter?
A.VE1(config)iproute
B.VE1(config)ipdefault-route
C.VE1(config)ipdefault-gateway
D.VE1(config)iproute
正確答案:ABCD
VE1(config)iprouteVE1(config)ipdefault-routeVE1(config)ipdefault-gatewayVE1(config)iproute
解析:解析:Explanation:Thecommand"IProutequot;$commandisusedtoconfigureadefaultrouteonarouter.Inthiscase,adefaultroutewithanexthopIPaddressofwasconfigured.IncorrectAnswers:A.Thiswillbeaninvalidroute,sincethe""valuewillspecifythenetworkmask,whichinthiscaseisinvalid.B,C.Thesecommandsareinvalid.Thecommand"ipdefault-network"couldbeused,butnot"ipdefault-route"or"ipdefault-gateway".IPdefault-gatewayisusedonswitches,notrouters.
11.[單選題]通過路由器的“配置端口console”對路由器進行配置,應(yīng)該使用的線纜為()
A.交叉線纜
B.直通線纜
C.反轉(zhuǎn)線纜
D.任意線纜
正確答案:C
反轉(zhuǎn)線纜
解析:C
12.[單選題]Areceivinghosthasfailedtoreceiveallofthesegmentsthatitshouldacknowledge.Whatcanthehostdotoimprovethereliabilityofthiscommunicationsession?
A.StartanewsessionusingUDP
B.ObtainanewIP
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