思科认证考试试题题库7章

思科认证考试试题题库7章第1章

缺省路由是最后一条被使用的特殊的静态路由。

此题为判断题（对，错）。

正确答案：7

R1上执行showipinterfacebrief命令的输出中显示接口S0/0/0状态码为

“down"和"down”,那么以下哪种情况可能属实

A.接口当前配置了shutdown命令

B.R1的串行接口两端协议不同

C.R1的串行接口没有安装串行电缆

D.两台路由器的串行链路,只有一端配置了IP地址

正确答案：C

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?

Cshcw?

D.showhelp

正确答案：C

路由器上，命令"showintsO"的显示结果为:SerialOisupjineprotocolis

down出现该结果的可能原因是()

A.端口处于关闭状态

B.物理端口被烧毁

C.两端设备协议不一致

D.路由表中无路由

正确答案：C

要安装RTU许可证以使用评估版功能，可使用哪个命令?()

A.installRight-To-Uselicensefeaturefeature

B.installtemporaryfeaturefeature

C.licenseinstallfeature

D.licensebootmodule

答案：D

思科认证考试试题题库7章第2章

WhichofthefollowingaretrueofEthernettechnology?

A.Hostsusealogicalringtopology.

B.Hostsusealogicalbustopology

C.Hostsmustwaitforanelectronicsignaltotransferdata.

D.HostsaredirectlyconnectedtoawiringconcentratorcalledaMSAL).

E.Noneoftheabove

正确答案：B

解析：

Explanation:LANtopologiesdefinethemannerinwhichnetworkdevicesareorganized.

FourcommonLANtopologiesexist:bus,ring,star,andtree.Thesetopologiesarelogicala

rchitectures,buttheactualdevicesneednotbephysicallyorganizedintheseconfigurati

ons.Logicalbusandringtopologies,forexample,arecommonlyorganizedphysicallyas

astar.AbustopologyisalinearLANarchitectureinwhichtransmissionsfromnetworkstat

ionspropagatethelengthofthemediumandarereceivedbyallotherstations.Ofthethre

emostwidelyusedLANimplementations,Ethernet/IEEE8023networks,includingl00B

aseTJmplementabustopolcgy,whichisillustrateclinFigure2-

3.Somenetworksimplementalocalbustopology.

基本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：B

WhichOSIlayerisassociatedwiththefollowing:Theacknowledgementof

transmissions,sequencing,andflowcontrolacrossanetwork?

A.Layer2

B.Layer3

C.Layer4

D.Layer5

E.Layer6

F.Layer7

正确答案：C

C解析:Explanation:

TheTransportlayer(Layer4)definesseveralfunctions,includingthechoiceof

protocols.ThemostimportantLayer4functionsareerrorrecoveryandflow

control.Thetransportlayermayprovideforretransmission,i.e.,errorrecovery,

andmayuseflowcontroltopreventunnecessarycongestionbyattemptingto

senddataataratethatthenetworkcanaccommodate,oritmightnot,

dependingonthechoiceofprotocols.Multiplexingofincomingdatafordifferent

flowstoapplicationsonthesamehostisalsoperformed.Reorderingofthe

incomingdatastreamwhenpacketsarriveoutoforderisincluded.Examples

include:TCP,UDP,andSPX.

TCP23是（）协议端口号；UDP69是（）端口号；TCP80是（）端口号。

A.TELNETFTPHTTP

B.FTPTFTPHTTP

C.TELNETTFTPHTTP

D.TELNETDNSHTTP

正确答案：C

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

思科认证考试试题题库7章第3章

哪个ACL可允许主机0访问web服务器44()

A.access-list101permittcphost0eq80host24

B.access-list101permittcp0host24

eq80

C.access-list101permithost0host24

eq80

D.access-list101permittcp0host24eq80

正确答案：D

YouhavesetupanInternetbasedFTPserver,wherepeoplecanuploadand

downloadfiles.IntermsoftheOSImodel,whatisthehighestlayerusedduring

theFTPsessions.

A.Application

B.Presentation

C.Session

D.Transport

E.Internet

F.DataLink

G.Physical

正确答案：A

A解析：Explanation:

Theapplicationlayeristhehighestlayer(layer7)oftheOSImodel,andis

reservedforenduserapplications.SinceFTPisitselfanapplication,layer7isthe

highestlayerused.

IncorrectAnswers:

B,C,D,E,F,G.InanygivenFTPsession,alloftheselayerswillbeusedatsome

pointbuttheyareincorrectbecausethequestionaskedforthehighestlayer

usedbyFTP.

以下关于RIPV1和RIPV2的描述正确的有()

A.RIPV1不带度量值，RIPV2带有度量值

B.都使用广播进行路由更新

C.RIPV1使用广播更新，RIPV2使用组播更新

D.RIPV1是有类路由协议，RIPV2是无类路由协议

正确答案：CD

下图中如果允许/24和10Q0.0/8的网络之间通信，必须要配置的

两条命令是什么()

A.A(config)iproute

B.A(config)iprouteS0/0/0

C.A(config)iproute

D.B(config)iproute

E.B(config)iproute192168.1.0

F.Biproute

正确答案：AD

TheEzonexamnetwor<administratorneedstoaswitchnamedVE1to

becometherootbridgeforaredundantpathswitchednetwork.Whatcanbe

donetoensurethatVE1willalwaysassumetheroleastnerootbridge?

A.AssigntheswitchahigherMACaddressthantheotherswitchesinthe

networkhave

B.Establishadirectlinkfromtheswitchtoallotherswitchesinthenetwork

C.Configuretheswitchfull-duplexoperationandconfiguretheother

switchesforhalf-duplexoperation

D.Configuretheswitchsothatithaslowerprioritythanotherswitchesin

thenetwork

E.Noneoftheabove

正确答案：D

思科认证考试试题题库7章第4章

哪个命令显示配置寄存器的设置?()

A.showiproute

B.showbootversion

C.showversion

D.showflash

答案：C

下面哪些不是RIP-V1版本所携带的信息()。

A版本

B.IP地址

C.子网掩码

D度量值

正确答案：C

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地址表

D.路由表

正确答案：B

将/24-/24这8个网络进行精确汇总，结果是()

A./16

B./21

C./21

D./16

正确答案：C

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

思科认证考试试题题库7章第5章

AEzonexamEthernetswitchreceivesaunicastframe,withadestinationMAC

thatislistedintheswitchtable.Whatwillthisswitchdowiththeframe?

A.Theswitchwillforwardtheframe,toaspecificport

B.Theswitchwillforwardtheframe,toallportsexcepttheportonwhichit

wasreceived

C.Theswitchwillreturnaropyofthpframe,outthesourcpport

D.Theswitchwillnotforwardunicastframes

E.TheswitchwillremovethedestinationMACfromtheswitchtable

F.Noneoftheabove.

正确答案：A

A解析：Explanation:

HowDoestheSwitchFindHostMACs?

Let'susethediagrambelowtohelpusunderstandhowaddresslearningprocess

takesplace.

DataLinkAddressLearning

Mactable

FEO/O:0000.74a3.0023

/FE0/11:0000.43C5.334C

2、

FeOZO/FeO/5FeO/8\FeO/ll

Let'sassumethatwehavejustpoweredontheswitch.IthasnothinginitsMAC

table.Weconnectthecablesfromthehostsontheswitchinterfacesasshownin

thediagram.HostAinitiatesaconnectiontowardsHostD,andthefollowing

takesplace:

1.HostA(interfacefeO/O)sendsaframe,toHostD(MAC

address:0000.43c5.334c).

2.TheswitchinspectstheSourceAddressintheframe.andnotesinitstablethe

MACaddressofHostAalongwiththeInterfacenumberfromwhichtheframe,

originated.

3.TheswitchinspectstheDestinationAddressintheframe.Sinceitdoesnot

haveHostsDMACaddressinitstable,itconstructsabroadcastframe,and

forwardsoutallinterfacesexcepttheinterfacefromwheretheoriginalframe,

arrived.

4.HostDidentifiesitselfastheexpectedrecipientandrespondsbacktoHostA.

Theswitchreceivestheresoondframe.oninterfacefeO/11andplacestheSAin

itstablealongwiththeinterfacenumberwheretheframe,camefrom.

5.Fromnowon,furthercommunicationbetweenthetwohostswillbeswitched

totheappropriateinterfacesbasedontheMACtablesentries.

Thisprocesstakesplaceeverytimeanewhostisattachedontheswitchand

initiatestraffic.TheswitchtriestokeepitsMACtableup-to-date,thereforeif

somehostsdonotinitiatetrafficforacertainamountoftime,theswitchremoves

themfromitstableandreinsertsthemwhentheybeginsendingtraffic.

89.56.178和下列PC()属于同一子网。

A.73/28

B.90/28

C.65/28

D.30/28

正确答案：B

下列选项中不属于数据链路层的广域网通信协议的是()。

A.HDLC

B.PPP

C.ICMP

D.Frame-Relay

正确答案：C

Youhavejustpurchasedabrandnewrouterandwishtohavetherouter

promptyouthroughtheinitialconfigurationcommands.Whichroutermode

doesthisdescribe?

A.ROMMonitormode

B.SETUPmode

C.Autoflashmode

D.RXBOOTmode

E.Noneoftheabove

正确答案：B

解析:Explanation:

Setupmodeisaconvenientmodethatwalksyouthroughthesetupprocedure

bypromptingyouwithspecificquestionsandoptionsonebyone.

要启用LACP,可将EtherChannel模式设置为下面哪两种之一?()

A.On

B.Prevent

C.Passive

D.Auto

E.Active

F.Desirable

答案：CE

思科认证考试试题题库7章第6章

配置寄存器设置0x2102给路由器提供了哪种功能?()

A.让路由器进入ROM监视器模式

B.提供了密码恢复功能

C.让路由器在NVRAM中查找boot命令

D.从TFTP服务器加载IOS

E加载存储在ROM中的IOS映像

答案：C

Whichprotocolautomatesallofthefollowingfunctionsforhostsona

network:IPconfiguration,IPaddresses,subnetmasks,defaultgateways,andDNS

serverinformation?

A.CDP

B.SNMP

C.DHCP

D.ARP

E.DNS

F.Noneoftheabove

正确答案：C

C解析：Explanation:

DHCPusestheconceptoftheclientmakingarequestandtheserversupplying

theIPaddresstotheclientplusotherinformationsuchasthedefaultgateway,

subnetmask,DNSIPaddress,andotherinformation.

IncorrectAnswers:

A.CDPistheCiscoDiscoveryProtocol.ItisusedbyCiscodevicesatthedatalink

layertoobtaininformationabouttheirdirectlyconnectedneighbors.

B.SNMPistheSimpleNetworkManagementProtocol.Thisisusedforthe

maintenance,management,andmonitoringofnetworkdevices.

D.ARPistheAddressResolutionProtocol,whichisusedtoresolvelayer2MAC

addressestolayer3IPaddresses.

E.DNSistheDomainNamsService.Itisusedtoresolvedomainnames(for

example,)toIPaddresses.TheIPaddresslocationofprimary

andsecondaryDNSresolverserverscanbeobtainedforhostsusingDHCP.

在配置OSPF时，网络管理员使用环回接口的原因是()

A.只有环回地址可以用作OSPF的路由器ID

B.环回接口用于设置OSPF度量

C.环回地址高于配置的路由器优先级值

D.环回接口是逻辑接口，不会失效

正确答案：D

YouwanttoupgradetheEzonexamLANsothatallportsoperateinfull

duplexmode.Whichstatementistrueaboutfull-duplexEthernetwhen

comparingtohalf-duplexEthernet?

A.Full-duplexEthernetconsistsofasharedcablesegment.Half-duplex

providesapoint-to-pointInk

B.Full-duplexEthernetusestwowirestosendandreceive.Half-duplex

Ethernetusesonewiretosendandreceive

C.Full-duplexEthernetcanprovidehigherthroughputthancanhalf-duplex

Ethernetofthesamebandwidth

D.Full-duplexEthernetusesaloopbackcircuittodetectcollisions.Half­

duplexEthernetusesajamsignal

E.Noneoftheabove

正确答案：C

对于以下ACL语句描述正确的是()

RI(config)#access-list101denyi^cn^any192.168.10.00.0.0.255echo

RIcess-list101permitXfianyany

RI(config)#intf0/l

RI(config-if)#.ip.access-group101in

A.在F0/1口入方向拒绝PING的请求

B.在F0/1口入方向拒绝所有数据包

C.在F0/1口出方向拒绝PING的回包

D.在F0/1口出方向拒经所有PING包

正确答案：A

思科认证考试试题题库7章第7章

通过路由器的"配置端口console”对路由器进行配巴，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：C

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

Youareloggedintoarouterandwishtoviewthelayer3informationabout

yourneighboringCiscorouters.WhatIOScommandgiveslayer3informationfor

ofthedirectlyconnectedrouterinterfaces?

A.showiplinks

B.showcdpneighbor

C.showcdpneighbordetail

D.showipclients

E.showiproute

F.Noneoftheabove

正确答案：C

C解析：Explanation:

Todisplaydetailedinformationaboutneighboringdevicesdiscoveredusing

CiscoDiscoveryProtocol(CDP),usetheshowcdpneighborsprivilegedEXEC

command.

Detail-(Optional)Displaysdetail