2023年思科认证考试题库2带答案解析

2023年思科认证考试题库带答案解析预祝考试顺利！第1卷一.综合考试题库(共20题)1.[单选题]混合型协议既具有“距离矢量路由协议”的特性，又具有“链路状态路由协议”的特性，下列协议中属于混合型协议的是：()

A.RIP

B.OSPF

C.EIGRP

D.IGRP

正确答案:C

EIGRP

解析：C

2.[单选题]某网络中，拟设计10子网，每个子网中放有14台设备，用IP地址段为199.41.10.X，请问符合此种规划的子网掩码是()

A.255.255.255.0

B.255.255.240.0

C.255.255.255.240

D.255.248.0.0

正确答案:C

255.255.255.240

解析：C

3.[单选题]OSPF骨干区的区域编号为（）

A.0.0.0.1

B.255

C.0.0.0.0

D.255.255.255.255

正确答案:C

0.0.0.0

解析：C

4.[单选题]The201.145.32.0networkissubnettedusinga/26mask.HowmanynetworksandIPhostspernetworkexistsusingthissubnetmask?

A.4networksand64hosts

B.64networksand4hosts

C.4networksand62hosts

D.62networksand2hosts

E.6networkand30hosts

正确答案:C

4networksand62hosts

解析：解析：Explanation:

5.[单选题]IP地址为：192.168.50.70，掩码为：255.255.255.248，则该IP地址所在子网的子网有效IP为（）

A.192.168.50.33---192.168.50.39

B.192.168.50.41---192.168.50.50

C.192.168.50.65---192.168.50.70

D.192.168.50.66---192.168.50.75

正确答案:C

192.168.50.65---192.168.50.70

解析：C

6.[单选题]两台路由器直连到一起，应该使用的线缆为（）

A.交叉线缆

B.直通线缆

C.反转线缆

D.任意线缆

正确答案:A

交叉线缆

解析：A

7.[多选题]交换机的三大功能为（）

A.地址学习

B.转发过滤

C.消除回路

D.发送数据包(packet)

正确答案:ABC

地址学习转发过滤消除回路

解析：ABC

8.[单选题]下列关于路由器和交换机的描述中，错误的是（）

A.路由器可以用来连接internet

B.二层交换机可以用来实现“异地网络”互连

C.路由器可以用来做路径选择

D.交换机可以转发广播

正确答案:D

交换机可以转发广播

解析：D

9.[单选题]如果把路由器的某个端口的IP配置为：192.168.10.64，掩码配置为：255.255.255.248，则该端口（）

A.能和其他设备正常通信

B.会变成“administrativelydown”状态

C.端口被烧毁

D.出现错误提示，配置命令执行失败

正确答案:B

会变成“administrativelydown”状态

解析：B

10.[多选题]Whichofthefollowingstatementscorrectlydescribethedifferencesbetweenhalf-duplexandfull-duplexEthernet?(Selecttwoanswerchoices.)

A.Full-duplexEthernetusesCSMA/CDtopreventcollisions.

B.Half-duplexEthernetusesaloopbackcircuittodetectcollisions.

C.Afull-duplexEthernetcardallows20Mbpsfordatatransmission.

D.Full-duplexEthernetmakesuseoftwopairsofwiresfordata.

E.AnEthernethubcanoperatebothhalfandfullduplexsimultaneously.

正确答案:BD

Half-duplexEthernetusesaloopbackcircuittodetectcollisions.Full-duplexEthernetmakesuseoftwopairsofwiresfordata.

解析：解析：Explanation:

11.[多选题]CDPisbeingusedthroughouttheEzonexamnetwork.WhataretworeasonswhytheEzonexamnetworkadministratorwoulduseCDP?(Choosetwo)

A.Todeterminethestatusofnetworkservicesonaremotedevice

B.ToobtaintheIPAddressofaconnecteddeviceinordertotelnettothedevice

C.Toverifythetypeofcableinterconnectingtwodevices

D.ToverifyLayer2connectivitybetweentwodeviceswhenLayer3fails

E.ToobtainVLANinformationfromdirectlyconnectedswticehs

F.F.Todeterminethestatusoftheroutingprotocolsbetweendirectlyconnectedrouters

G.G.Tosupportautomaticnetworkfailoverduringoutages

正确答案:BD

ToobtaintheIPAddressofaconnecteddeviceinordertotelnettothedeviceToverifyLayer2connectivitybetweentwodeviceswhenLayer3fails

解析：B,D

12.[多选题]Whichthreestatementsaretrueabouttheoperationofafull-duplexEthernetnetwork,whichisbeingusedintheEzonexamLAN?(Choosethree)

A.Ethernethubportsarepreconfiguredforfull-duplexmode.

B.Thehostnetworkcardandtheswitchportmustbecapableofoperatinginfull-duplexmode.

C.Therearenocollisionsinfull-duplexmode.

D.Inafull-duplexenvironment,thehostnetworkcardmustcheckfortheavailabilityofthenetworkmediabeforetransmitting.

E.Adedicatedswitchportisrequiredforeachfull-duplexnode.

正确答案:BCE

Thehostnetworkcardandtheswitchportmustbecapableofoperatinginfull-duplexmode.Therearenocollisionsinfull-duplexmode.Adedicatedswitchportisrequiredforeachfull-duplexnode.

解析：解析：Explanation:

13.[单选题]为了查看路由器的E0端口上，是否挂接了访问权限表，应该使用的命令是（）

A.showaccess-list

B.showinterfacee0

C.showipinterfacee0

D.showe0

正确答案:B

showinterfacee0

解析：B

14.[单选题]在启用IGRP协议时，所需要的参数是：()

A.网络掩码

B.子网号

C.自治系统号

D.跳数

正确答案:C

自治系统号

解析：C

15.[单选题]下面哪个操作可以使访问控制列表真正生效（）。

A.将访问控制列表应用到接口上

B.定义扩展访问控制列表

C.定义多条访问控制列表的组合

D.用access-list命令配置访问控制列表

正确答案:A

将访问控制列表应用到接口上

解析：A

16.[单选题]Whichoneofthefollowingcharacteristicsistrueregardingtheuseofhubsandswitches?

A.HubscanhavetheirportsbeconfiguredwithVLANs

B.Usinghubsiscostlywithregardtobandwidthavailability.

C.Switchescannotforwardbroadcasts.

D.Switchesaremoreefficientthanhubsinprocessingframes.

E.Switchesincreasethenumberofcollisiondomainsinthenetwork.

正确答案:E

Switchesincreasethenumberofcollisiondomainsinthenetwork.

解析：解析：Explanation:Switchesincreasesthenumberofcollisionsdomainsinthenetwork.SwitchesthatareconfiguredwithVLANswillreducethesizeofthecollisiondomainsbyincreasingthenumberofcollisiondomainsinanetwork,butmakingthemsmallerthanthatofonebig,flatnetwork.IncorrectAnswers:A.SwitchesarecapableofVLANconfigurations,buthubsarenot.B.Hubsaregenerallytheleastcostlymethodpossibletoconnectmultipledevicestogetherinanetwork.C.Switchesforwardbroadcastsandmulticasts,bydefault,toallportswithinthesameVLAN.Onlyroutersblockallbroadcasttrafficbydefault.D.Switchesandhubscanbeequallyefficientinprocessingframes,intheory.Inpractice,switchesaregenerallymoreefficientastheyusuallyhavemoreCPUandmemoryallocatedtothem,andaregenerallymuchmoreexpensivethanasimplehub.

17.[单选题]ThenetworkadministratorhasconfiguredportsecurityonaEzonexamswitch.WhywouldanetworkadministratorconfigureportsecurityonthisEzonexamdevice?

A.TopreventunauthorizedhostsfromgettingaccesstotheLAN

B.TolimitthenumberofLayer2broadcastsonaparticularswitchport

C.TopreventunauthorizedTel