2021思科认证每日一练9辑

2021思科认证每日一练9辑第1辑

你使用命令copyrunning-configstartup-config保存路由器的配置，并重启路由

器，但路由器启动后没有任何运行配置。请问可能出现了什么问题?（）

A.启动路由器时使用的命令不对

B.NVRAM受损

G配置寄存器的设置不正确

D.新升级到的I0S与路由器硬件不兼容

E.保存的配置与硬件不兼容

答案：C

CHAP验证时，将对方的主机名HOST作为自己的用户名USER。

此题为判断题（对，错）。

正确答案：V

扩展IP访问权限表的表号范围是：（）

A.1—100

B.1-99

C.100-199

D.800-899

正确答案：C

WhichofthefollowingcanleadtothecontributionofLANtraffic

congestion?(Selectallthatapply)

A.Toomanyhostsinabroadcastdomain

B.Fullduplexoperation

C.Broadcaststorms

D.Multicasting

E.Segmentation

F.Lowbandwidth

正确答案：ACF

A,C,F解析：Explanation:

ChoiceAiscorrectbecausethemorehostsonabroadcastdomain,themore

trafficthatiscreated.ChoiceCcontributestocongestionbecausebroadcast

stormscanbecomeveryproblematic,andleadtocompletenetworksaturation.

MulticastsaresimilartobroadcastsintheiruseonaLAN.Finally,ifthereisnot

enoughbandwidth,trafficsessionscantimeout.Thisleadstonewtransmissions

andthere-sendingofdata,whichcanleadtomorecongestion.

IncorrectAnswers:

B,E.Theseareincorrectbecausefullduplexoperationandsegmentednetworks

actuallyresultinlesscongestion.

D.Multicastingcanactuallyalleviatecongestionissues,assinglestreamsof

informationcanreachmultiplehostsatthesametime,insteadofusingaseries

ofpointtopointconnections.

OSPF在同一区域内，下列说法正确的是（）

A.每台路由器生成的LSA都是相同的

B.每台路由器的LSDB（链路状态数据库）都是相同的

C.每台路由器根据该LSDB计算出的最短路径树都是相同的

D每台路由器根据该最短路径树计算出的路由都是相同的

正确答案：B

EzonexamneedstoensuretheirIPnetworkcanbereachedfromthe

Internet.Whichofthefollowinghostaddressesaremembersofnetworksthat

canberoutedacrossthepublicInternet?（Choosethree.）

A.5

B.25

C.9

D.52

E.5

F.54

正确答案：CEF

C,E,F解析：Explanation:

InInternetterminology,aprivatenetworkisanetworkthatusesRFC1918IP

addressspace.Computersmaybeallocatedaddressesfromthisaddressspace

whenit'snecessaryforthemtocommunicatewithothercomputingdeviceson

aninternal(non-Internet)networkbutnotdirectlywiththeInternet.

ThreeblocksofIPaddressesarereservedforprivateuseandarenotroutedover

theInternet.Companiescanassigntheseaddressestonodesontheirprivate

LANsatanytimewithoutconflict.

TheEzonexamcorporateLANconsistsofonelargeflatnetwork.Youdecide

tosegmentthisLANintotwoseparatenetworkswitharouter.Whatwillbethe

affectofthischange?

A.Thenumberofbroadcastdomainswillbedecreased.

B.Itwillmakethebroadcastingoftrafficbetweendomainsmoreefficient

betweensegments.

C.Itwillincreasethenumberofcollisions.

D.Itwillpreventsegment1'sbroadcastsfromgettingtosegment2.

E.Itwillconnectsegment1'sbroadcaststosegment2.

正确答案：D

解析:Explanation

Arouterdoesnotforwardbroadcasttraffic.Itthereforebreaksupabroadcast

domain,reducingunnecessarynetworktraffic.Broadcastsfromonesegmentwill

notbeseenontheothersegment

IncorrectAnswers:

A.Thiswillactuallyincreasethenumberofbroadcastdomainsfromonetotwo.

B.Alllinkleveltrafficfromsegmentonetosegmenttwowillnowneedtobe

routedbetweenthetwointerfacesoftherouter.Althoughthiswillreducethe

trafficontheLANlinks,itdoesalsoprovidealessefficienttransportbetweenthe

segments.

C.Sincethenetworksizeiseffectivelycutintohalf,thenumberofcollisions

shoulddecreasedramatically.

E.Broadcastsfromonesegmentwillbecompletelyhiddenfromtheother

segment.

配置LACP时,在要使用的接口上必须将哪三个参数配置得完全相同?()

A.虚拟MAC地址

B.端口速度

C.双工模式

D.PortFast

E.VLAN信息

答案：BCE

2021思科认证每日一练9辑第2辑

当配置一个CISCO的路由器时，缺省的DR和BDR优先级是（）。

A.O

B.l

C.16

D.255

正确答案：B

网络中经常使用“帧中继”服务，请选出帧中继的优点（）

A.偷占带宽

B.提供拥塞管理机制

C.可以使用任意广域网协议

D.灵活的接入方式

正确答案：ABD

TheEzonexamnetworkadministratorhasissuedthe"VTPpassword

ezonexam"commandonaCiscodevice.Whatisthepurposeofthiscommand?

A.ItallowstwoVTPserverstoexistsinthesamedomain,eachconfigured

withdifferentpasswords

B.ItisthepasswordrequiredwhenpromotingaswitchfromVTPclient

modetoVTPservermode

C.ItisusedtoaccesstheVTPservertomakechangestotheVTP

configuration

D.ItisusedtovalidatethesourcesofVTPadvertisementssentbetween

switches

E.Noneoftheabove

正确答案：D

FromwheredoesasmallnetworktypicallygetitsIPnetworkaddressesorIP

block?

A.FromtheInternetDomainNameRegistry(IDNR)

B.FromtheInternetAssignedNumbersAuthority(IANA)

C.FromtheInternetServiceProvider(ISP)

D.FromtheInternetArchitectureBoard(IAB)

E.Noneoftheabove

正确答案：C

解析:Explanation:

NormallyasmallnetworkwillbeassignedanumberofIPaddressesfromtheir

ISPZorinsomecases；suchasDSLandcablemodem,asingledynamicIPaddress

w川beassignedbytheISP.OnlyverylargenetworksrequiringalargeIPblock

(normallymorethana/20)willregisterwithIANA,RIPE,orARIN(American

RegistryofInternetNumbers)toobtaintheirIPaddresses.

Afterworkingonarouter,someproblemsariseandyouwishtoviewthe

commandsthatyourecentlyentered.WhichIOScommandopensthehistory

bufferanddisplaysthemostrecentlyenteredcommands?

A.Showhistory

B.Showbuffers

C.Showtypedcommands

D.Showterminalbuffer

E.Showcommand

F.Noneoftheabove

正确答案：A

A解析:Explanation:

Therouterwillbufferpreviouslyenteredcommands.Bydefault,the"show

history"commandwilldisplaytheprevioustencommandsthatwereentered.To

seethecontentsofthebufferyouentertheshowhistorycommand.

IncorrectAnswers:

B.Thiscommandwillshowthememorybufferinformation

C,D.Theseareinvalidcommands.

WhichofthefollowingaretrueofEthernettechnology?

A.Hostsusealogicalringtopology.

B.Hostsusealogicalbustopology

C.Hostsmustwaitforanelectronicsignaltotransferdata.

D.HostsaredirectlyconnectedtoawiringconcentratorcalledaMSAU.

E.Noneoftheabove

正确答案：B

解析：

ExplanationlANtopologiesdefinethemannerinwhichnetworkdevicesareorganized.

FourcommonLANtopologiesexist:bus,ring,star,andtree.Thesetopologiesarelogicala

rchitectures,buttheactualdevicesneednotbephysicallyorganizedintheseconfigurati

ons.Logicalbusandringtopologies,forexample,arecommonlyorganizedphysicallyas

astar.AbustopologyisalinearLANarchitectureinwhichtransmissionsfromnetworkstat

ionspropagatethelengthofthemediumandarereceivedbyallotherstations.Ofthethre

emostwidelyusedLANimplementations,Ethernet/IEEE802.3networks,includingl00B

aseT,implementabustopology,whichis川ustratedinFigure2-

3.Somenetworksimplementalocalbustopology.

下列哪项OSI第2层功能是由PPP协议标准规范，但使用CISCO专有的

HDLC报头字段实现

A.成帧

B.寻址

C.错误检测

D识别帧内的协议类型

正确答案：D

OSPF骨干区域存在（）类LSA。

A.一类

B二类

C.三类

D.四类

E五类

F.七类

正确答案：ABCDE

2021思科认证每日一练9辑第3辑

Whichoftheprotocolsbelow,operatesatLayer2oftheOSImodel,andis

usedtomaintainaloop-freenetwork?

A.RIP

B.STP

C.IGRP

D.CDP

E.VTP

F.Noneoftheabove

正确答案：B

B解析：Expgnation:

STP(spanningtreeprotocol)operatesonlayer2topreventloopsinswitchesand

bridges.

IncorrectAnswers:

AzC.RIPandIGRPareroutingprotocols,whichareusedatlayer3tomaintaina

loopfreeroutedenvironment.

D.CDPdoesindeedoperateatlayer2,butitdoestnotprovideforaloopfree

topology.CDPisusedbyCiscodevicestodiscoverinformationabouttheir

neighbors.

E.VTPistheVLANTrunkingProtocol,usedtopassVLANinformationthrough

switches.ItreliesontheSTPmechanismtoprovidealoopfreenetwork.

WhataresomeofthecharacteristicsofatypicalVLANarrangement,found

throughouttheEzonexamswitchedLAN?(Selectallthatapply)

A.VLANslogicallydivideaswitchintomultiple,independentswitchesat

Layer2.

B.TrunklinkscancarrytrafficformultipleVLANs.

C.VLANimplementationsignificantlyincreasestrafficduetoaddedtrunking

information.

D.AVLANcanspanmultipleswitches.

E.VLANstypicallyincreasethenumberofswitchesneeded

F.VLANstypicallydecreasethenumberofswitchesneeded

正确答案：ABD

A,B,D解析：Explanation:

VLANsgiveyouthepowerofmakingvirtualLANnetworkstosubdividecollision

domainsintosmallerunitsoffunctionality,withoutbeinglimitedbyphysical

location.

AiscorrectbecausethatistheexactfunctionofaVLAN.Biscorrectbecause

trunklinksareusedtocarrytrafficformultipleVLANs.Discorrectbecausea

VLANcanandoftendoesspanacrossmultipleswitches.VTPmakesthispossible.

IncorrectAnswers:

C.Althoughtrunkinginformationdoesindeedaddsomelevelofoverhead,the

overalltrafficoverheadisgreatlyreducedthoughtheuseofVLANs.

E,F.Thenumberoftotalswitchesneededinanetworkistheresultofthe

numberofdevicesontheentireLANthatneedtobeconnected.WhetherVLANs

areusedornotwillhavelittle,ifany,impactonthetotalnumberofswitches

neededinaLAN.

Whichthreestatementsaretrueabouttheoperationofafull-duplex

Ethernetnetwork,whichisbeingusedintheEzonexamLAN?(Choosethree)

A.Ethernethubportsarepreconfiguredforfull-duplexmode.

B.Thehostnetworkcardandtheswitchportmustbecapableofoperating

infull-duplexmode.

C.Therearenocollisionsinfull-duplexmode.

D.Inafull-duplexenvironment,thehostnetworkcardmustcheckforthe

availabilityofthenetworkmediabeforetransmitting.

E.Adedicatedswitchportisrequiredforeachfull-duplexnode.

正确答案：BCE

解析:Explanation:

Half-duplexEthernetisdefinedintheoriginal802.3EthernetandCiscosaysyou

onlyuseonewirepairwithadigitalsignalrunninginbothdirectionsonthewire.

ItalsousestheCSMA/CDprotocoltohelppreventcollisionsandtopermit

retransmittingifacollisiondoesoccur.Ifahubisattachedtoaswitch,itmust

operateinhalf-duplexmodebecausetheendstationsmustbeabletodetect

collisions.

Half-duplexEthernet-typicallylOBaseT-isonlyabout30to40percentefficientas

Ciscoseesit,becausealargelOBaseTnetworkwillusuallyonlygiveyou3-to

4Mbps-atmost.Full-duplexEthernetusestwopairsofwires,insteadofonewire

pairlikehalfduplex.Also,fullduplexusesapoint-to-pointconnectionbetween

thetransmitterofthetransmittingdeviceandthereceiverofthereceivingdevice,

whichmeansthatwithfull-duplexdatatransfer,yougetafasterdatatransfer

comparedtohalfduplex.

Andbecausethetransmitteddataissentonadifferentsetofwiresthanthe

receiveddata,nocollisionsoccur.Thereasonyoudon'tneedtoworryabout

collisionsisbecausenowFull-duplexEthernetislikeafreewaywithmultiplelanes

insteadofthesingle-laneroadprovidedbyhalfduplex.Full-duplexEthernetis

supposedtooffer100percentefficiencyinbothdirections;thismeansyoucan

get20Mbpswitha10MbpsEthernetrunningfullduplex,or200Mbpsfor

FastEthernet.

在地址转换中，()用来规定哪些数据包需要进行地址转换

A.在线用户表

B.访问控制列表

C.MAC典表

D.路由表

正确答案：B

以下哪个命令让路由器在show之后显示有效的参数列表

A.sh?

B.show?

C.show?

D.showhelp

正确答案：C

请参见图示图中的所有网络都带有/24前缀假设网络中的所有路由器均已获知

所有路由，哪个地址最适合总结图中的网络()

A./21

B./24

C./24

D./21

正确答案：D

SplithorizonhasbeenenabledwithintheEzonexamroutednetwork.Which

oneofthefollowingstatementsbestexplainsthesplithorizonrule?

A.Onlyrouterscansplitboundaries(horizons)betweennetworksin

separateASnumbers.

B.EachASmustkeeproutingtablesconvergedtopreventdeadroutes

frombeingadvertisedacrossboundaries.

C.Oncearouteisreceivedonaninterface,advertisethatrouteas

unreachablebackoutthesameinterface.

D.Informationaboutarouteshouldneverbesentbackinthedirection

fromwhichtheoriginalupdatecame.

E.Noneoftheabove

正确答案：D

解析：Explanation:

Thesplithorizonrulestates:

*Neveradvertisearouteoutoftheinterfacethroughwhichyoulearnedit.

Forinstance,inFigure4abelow,ifRouterOneisconnectedtoRoutersTwoand

Threethroughasinglemultipointinterface(suchasFrame.Relay),andRouter

OnelearnedaboutNetworkAfromRouterTwo,itwillnotadvertisetherouteto

NetworkAbackoutthesameinterfacetoRouterThree.Routeroneassumesthat

RouterThreewouldlearnaboutNetworkAdirectlyfromRouterTwo.

IncorrectAnswers:

A:Thereisnosuchrequirement

B:Distancevectorprotocolsupdatesroutingtableatregularintervalsinsteadof

Topologychanges

C:Thisisthedefinitionofthepoisonreverserule,notthesplithorizonrule.

以下情况可以使用访问控制列表，描述准确的是（）.

A.禁止有CIH病毒的文件到我的主机

B.禁止黑客访问我的主机

C.可以禁止所有使用Telnet的用户访问我的主机

D.禁止使用UNIX系统的用户访问我的主机

正确答案：ABD

2021思科认证每日一练9辑第4辑

EzonexamisusingIPaddressingaccordingtoRFC1918.Whichthreeaddress

rangesareusedforinternalprivateaddressblocksasdefinedbyRFC1918?

(Chooseallthatapply)

A.to255.255.255

B.to55

C.to55

D.to55

E..to55

F.to55

G.to55

正确答案：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.

已知某台路由器的路由表中有如下两个表项假如该路由器要转发目的地址为

的报文，则下列说法中正确的是()

A.选择第一项,因为OSPF协议的优先级高

B.选择第二项，因为RIP协议的花费值(Metric)小

C.选择第二项，因为出口是EthternetO,比SerialO速度快

D.选择第二项，因为该路由项对于目的地址9.L4.5来说，是更精确的匹配

正确答案：D

对于IP为,子网掩码为40,则该IP地址和子网掩

码相作用会得到一系列IP,从下列选项中选出属于“有效IP”的选项：（）

A.3

B.12

C.19

D.26

E.75

F.08

正确答案：ABCD

FTP工作在OSI哪一层（）

A.会话层

B.表示层

C.传输层

D.应用层

正确答案：D

IGP包括如下哪些协议()

A.RIP

B.BGP

C.IS-IS

D.OSPF

正确答案：ACD

YoudownloadafilefromanFTPsiteontheInternet.Whatisthehighest

layerintheOSImodelusedinthisFTPoperation?

A.Application

B.Presentation

C.Session

D.Transport

E.Internet

F.DataLink

G.Physical

正确答案：A

A解析：Explanation:

Layer7istheapplicationlayer,whichisthehighestlayerintheOSImodel.This

layerdescribestheuseofenduserapplications,suchasopeningmoviefiles(avi,

mpeg,etc)usedMicrosoftOfficeapplications,usingWWWbrowsers,using

Telnet,andusingFTP.

Thenetworkwassubnettedusinga/28subnetmask.How

manyusablesubnetsandhostaddressespersubnetwerecreatedasaresultof

this?

A.2networkswith62hosts

B.6networkswith30hosts

C.16networksand16hosts

D.62networksand2hosts

E.14networksand14hosts

F.Noneoftheabove

正确答案：F

F解析:Explanation:

AclassCsubnetwitha28bitmaskrequires4bitsforthenetworkaddress,

leaving4bitsforhostaddresses.Usingthe2n-2formula(24-2inthiscase)we

have14hostaddressesand16networkaddresses.

IncorrectAnswers:

A.Thiswouldbetheresultofa/26networkmask

B.Thiswouldbetheresultofa/27networkmask

C.Rememberweneedtoalwayssubtracttwoforthenetworkandbroadcast

addresses,sothisanswerisincorrect.

D.Thiswouldbetheresultofa/30networkmask.

网络管理员输入routerospf100命令，命令中数字100的作用是（）

A.自治系统编号

B.度量值

C进程ID

D.管理距离

正确答案：C

2021思科认证每日一练9辑第5辑

OSPF协议中，ABR的不同端口可能运行在不同的area中，其中一定有接口

运行在（）当中.

A.areaO

B.areal

C.arealO

D.arealOO

正确答案：A

以下哪一项不是有关虚电路交换方式的正确描述。（）

A.分组需要包含虚电路标识符

B.某条虚电路对应的转发项只给出该虚电路经过的两个端口之间的关联

C.虚电路标识符用于建立终端间传输路径与终端间传输的数据之间的绑定

D.虚电路是指终端间传输路径

参考答案：A

OSPF在建立邻接关系的过程中使用了哪几类报文（）

A.HELLO报文

B.DBD（数据库描述）报文

C.LSR（链路状态请求）报文

D.LSU（链路状态更新）报文

正确答案：ABCD

在广域网结构中使用什么连接DTE和DCE设备()。

A.本地环路

B.接口线缆

C.路由器

D.交换机

正确答案：B

下面有关交换机的描述中，正确的是()

A.所有交换机都支持VLAN功能

B.交换机端口数量最多为48口

C.交换机独占带宽

D.交换机端口的最大速率为100Mbit/s

正确答案：C

对于以下ACL语句描述正确的是()

RI(config)#ipaccess-liststandardTELNET

RI(config_std-nacl)#permit

R1(config)#1ineyty04

RI(config-1ine)#access-classTELNETin

A.只允许的数据流穿过R1

B.只允许192.16842对R1进行TELNET

C.只允许对R1进行TELNET并拒绝其它流量

D.只允许192.16840/24网段的数据流穿过R1

正确答案：B

ThenetworkadministratorhasconfiguredportsecurityonaEzonexam

switch.Whywouldanetworkadministratorconfigureportsecurityonthis

Ezonexamdevice?

A.TopreventunauthorizedhostsfromgettingaccesstotheLAN

B.TolimitthenumberofLayer2broadcastsonaparticularswitchport

C.TopreventunauthorizedTelnetorSSHaccesstoaswitchport

D.TopreventtheIPandMACaddressoftheswitchandassociatedports

E.Noneoftheabove

正确答案：A

解析:Explanation:

Youcanusetheportsecurityfeaturetorestrictinputtoaninterfacebylimiting

andidentifyingMACaddressesofthestationsallowedtoaccesstheport.When

youassignsecureMACaddressestoasecureport,theportdoesnotforward

packetswithsourceaddressesoutsidethegroupofdefinedaddresses.Ifyou

limitthenumberofsecureMACaddressestooneandassignasinglesecure

MACaddress,theworkstationattachedtothatportisassuredthefullbandwidth

oftheport.

IfaportisconfiguredasasecureportandthemaximumnumberofsecureMAC

addressesisreached,whentheMACaddressofastationattemptingtoaccess

theportisdifferentfromanyoftheidentifiedsecureMACaddresses,asecurity

violationoccurs.Also,ifastationwithasecureMACaddressconfiguredor

learnedononesecureportattemptstoaccessanothersecureport,aviolationis

flagged.

Aftermakingsomenetworkchangesyoupoweroffandthenpoweronyour

CiscorouternamedVE1.WhatsequenceofeventsoccurswhenVE1ispowered

up?

A.Perform.POST,locateconfigurationstatements,applyconfiguration

statements,locateCiscoIOSsoftware,andloadCiscoIOSsoftware.

B.LocateCiscoIOSsoftware,loadCiscoIOSsoftware,locateconfiguration

statements,applyconfigurationstatements,andperform.POST.

C.Testsoftwareroutines,POST,loadconfigurationfiles,loadCiscoIOS

software,testCiscoIOSsoftware.

D.Perrform.POST,locateCiscoIOSsoftware,loadtheCiscoIOSsoftware,

locateconfigurationstatements,andapplyconfigurationstatements.

E.LoadandtestIOS,loadconfigurationfiles,testsoftwareroutines,POST.

F.Noneoftheabove

正确答案：D

D解析:Explanation:

Uponinitialstartup,Ciscoroutersperform,thefollowingstepsinorder:

1.Therouterperformsapower-onself-test(POST)todiscoverandverifythe

hardware.

2.TherouterloadsandrunsbootstrapcodefromROM.

3.TherouterfindstheIOSorothersoftwareandloadsit.

4.Therouterfindstheconfigurationfileandloadsitintorunningconfig.

2021思科认证每日一练9辑第6辑

WhichofthefollowingareVLANframe,encapsulationtypesthatmaybe

configuredonaCatalystswitch?(Choosetwo.)

A.VTP

B.ISL

C.CDP

D.802.1Q

E.802.1p

F.LLC

正确答案：BD

B,D解析：Explanation:

ThetwoVLANtrunkingencapsulationtypesare:

Inter-SwitchLink(ISL):ThisisproprietarytoCiscoswitches,andit'susedforFast

EthernetandGigabitEthernetlinksonly.ISLroutingcanbeusedonaswitchport,

routerinterfaces,andserverinterfacecardstotrunkaserver.ISLletsyou

explicitlytagVLANinformationontoanEthernetframe.Thistagginginformation

allowsVLANstobemultiplexedoveratrunklinkthroughanexternal

encapsulationmethod,whichallowstheswitchtoidentifytheVLANmembership

ofaframe,overthetrunkedlink.

IEEE802.1Q:CreatedbytheIEEEasastandardmethodofframe,tagging,this

actuallyinsertsafieldintotheframe,toidentifytheVLAN.Ifyou'retrunking

betweenaCiscoswitchedlinkandadifferentbrandofswitch,youhavetouse

802.1Qforthetrunktowork.

下面哪条命令是正确的，如果要将/24的业务网段发到OSPF的

areaO()

A.Router(config-router)network550

B.Router(config-router)network55areaO

C.Router(config-router)network55areaO

D.Router(config-router)networkareaO

正确答案：B

要在连接到服务器的端口上禁用STP,可使用下面哪个命令?()

A.disablespanning-tree

B.spanning-treeoff

C.spanning-treesecurity

D.spanning-treeportfast

答案：D

OSPF的度量值是什么0

A.跳数

B.接口开销

C.矢量距离

D专连路状态

正确答案：D

关于RIP协议，下列说法正确的有()

A.RIP协议是一种IGP

B.RIP协议是一种EGP

C.RIP协议是一种距离矢量路由协议

D.RIP协议是一种链路状态路由协议

正确答案：AC

请参见下图。哪个地址是内部全局地址()

A.

B.

C.5

D.

正确答案：C

TheEzonexamnetworkadministratorneedstoaswitchnamedVE1to

becometherootbridgeforaredundantpathswitchednetwork.Whatcanbe

donetoensurethatVE1willalwaysassumetheroleastherootbridge?

A.AssigntheswitchahigherMACaddressthantheotherswitchesinthe

networkhave

B.Establishadirectlinkfromtheswitchtoallotherswitchesinthenetwork

C・Configuretheswitchfull-duplexoperationandconfiguretheother

switchesforhalf-duplexoperation

D.Configuretheswitchsothatithaslowerprioritythanotherswitchesin

thenetwork

E.Noneoftheabove

正确答案：D

路由器下"特权用户模式”的标识符是：（）

A.>

B.!

C.

D.（config-if）

正确答案：C

2021思科认证每日一练9辑第7辑

在路由器中，如果去往同一目的地有多条路由，则决定最佳路由的因素有（）

A.优先级

B.发布者

C.metirc值

D.生存时间

正确答案：AC

OSPF的度量值是什么()

A.跳数

B.接口开销

C.矢量5巨离

D专连路状态

正确答案：D

HowcanaEzonexamadministratordetermineifarouterhasbeen

configuredwhenitisfirstpoweredup?

A.Aconfiguredrouterpromptsforapassword

B.Aconfiguredroutergoestotheprivilegedmodeprompt

C.Anunconfiguredroutergoesintothesetupdialog

D.Anunconfiguredroutergoestotheenablemodeprompt

正确答案：C

解析:Explanation:

Ifanon-configuredrouterisstarted,thenitgoesintosetupmodeandaskforthe

minimumconfigurationparameters(hostname,IPaddresstointerfaces,enable

password,etc).Iftherouterisalreadyconfigureditbootsbyimplementingthe

savedstartup-config.

为查看配置注册表设置，你需要输入哪个命令()

A.showrunning-config

B.showstartup-config

C.showversion

D.showcontrollers

正确答案：C

TheEzonexamnetworkadministratorwantstoensurethatonlyasingleweb

servercanconnecttopotFaO/1onacatalystswitch.Theserverispluggedinto

theswitch'sFastEth.0/1portandthenetworkadministratorisabouttobringthe

serveronline.WhatcantheadministratordotoensurethatonlytheMAC

addressofthisserverisallowedbyswitchportFaO/1?(Choosetwo)

A.ConfigureportFaO/1toacceptconnectionsonlyfromthestaticIP

addressoftheserver

B.ConfiguretheMACaddressoftheserverasastaticentryassociatedwith

portFaO/1

C.EmployaproprietaryconnectortypeonFaO/1thatisincomputablewith

otherhostconnectors

D.ConfigureportsecurityonFaO/1torejecttrafficwithasourceMAC

addressotherthanthatoftheserver

E.BindtheIPaddressoftheservertoitsMACaddressontheswitchto

preventotherhostsfromspoofingtheserverIPaddress

正确答案：BD

解析:Explanation:

YoucanuseportsecuritytoblockinputtoanEthernet,FastEthernet,orGigabit

EthernetportwhentheMACaddressofthestationattemptingtoaccesstheport

isdifferentfromanyoftheMACaddressesspecifiedforthatport.

Whenasecureportreceivesapacket,thesourceMACaddressofthepacketis

comparedtothelistofsecuresourceaddressesthatweremanuallyconfiguredor

autoconfigured(learned)ontheport.IfaMACaddressofadeviceattachedto

theportdiffersfromthelistofsecureaddresses,theporteithershutsdown

permanently(defaultmode),shutsdownforthetimeyouhavespecified,or

dropsincomingpacketsfromtheinsecurehost.

Theport'sbehavior,dependsonhowyouconfigureittorespondtoasecurity

violation.Whenasecurityviolationoccurs,theLinkLEDforthatportturns

orange,andalink-downtrapissenttotheSimpleNetworkManagement

Protocol(SNMP)manager.AnSNMPtrapisnotsentifyouconfiguretheportfor

restrictiveviolationmode.Atrapissentonlyifyouconfiguretheporttoshut

downduringasecurityviolation.

Whichoneofthefollowingprotocolsallowstheinformationaboutthe

configurationofanewVLANtobedistributedacrossentireswitchednetwork?

A.STP

B.VTP

C.EIGRP

D.SNMP

E.CDP

F.Noneoftheabove

正确答案：B

B解析：Explanation:

SybexCCNAStudyGuide4thEditionstatesonpage359:

"ThebasicgoalsofVLANTrunkingProtocol(VTP)aretomanageallconfigured

VLANsacrossaswitchedinternetworkandtomaintainconsistencythroughout

thatnetwork.VTPallowsanadministratortoadd,delete,andrenameVLANs-

informationthatisthenpropagatedtoallotherswitchesintheVTPdomain."

IncorrectAnswers:

A.STPistheSpanningTreeProtocol,usedtopreventbridgingloopsinaLAN.

C.EIGRPisaroutingprotocolusedtoexchangeroutinginformation,notVLAN

information.

D.SNMPistheSimpleNetworkManagementProtocol,usedtoprovide

informationtoremotenetworkmana