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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

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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