思科认证考试CCNA考试模拟题集锦171题及答案.docx

思科认证考试CCNA考试模拟题集锦171题及答案.docx

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思科认证考试CCNA考试模拟题集锦171题及答案

思科认证考试（ＣＣＮＡ）考试模拟题集锦（1-71题）及答案

19及答案

1.[OxNx]DuringaTFTPtransferusingCiscoRouterswhatisthenumericvalue,indecimal,ofthedestinationportfieldoftheUserDatagramProtocol（UDP）header?

a）96

b）47

c）arandomnumberabove1024

d）69

e）noneoftheabove

2.[CxNx]WhatisthestandardencapsulationmethodusedbyCiscoroutersfortheInternetProtocol（IP）onit’sEthernetinterfaces?

a）SNAP

b）ARPA

c）NOVELL-ETHER

d）DARPA

e）Ethernet_802.3

3.[CxNx]WhatwillbethecorrectcommandonaCiscoroutertosettheIPaddressofaninterfaceassumingyouareatthe"router（config-if）#"prompt?

a）ipaddress1.1.1.1255.255.255.0

b）ipaddress1.1.1.1

c）ip1.1.1.1

d）ip1.1.1.1255.255.255.0

e）noneoftheabove

4.[CxNx]WhichcommandswilldisplaytheIPaddressesofallinterfacesonaCiscoRouter?

（Chooseallthatapply）

a）showiproute

b）showipaddress

c）showipinterface

d）showinterface

e）displayipaddresses

5.[CxNx]WhichofthefollowingcommandswilldisplaythecontentsoftheARPcacheofyourCiscorouter?

a）showiparpcache

b）showiproute

c）showiparp

d）showarp

e）thereisnowaytodisplaytheARPcache

6.[CxNx]ReverseAddressResolutionProtocol（RARP）istheprocess:

a）WhereanIPhostresolvesit’sIPaddressbybroadcastingit’sMACaddresstothenetworkandaBOOTPserverassignsitanIPaddress.

b）WhereanIPhostresolvesit’sMACaddressbybroadcastingtothelocalnetworkit’sIPaddress.

c）WhereanIPhosttriestoresolvetheMACaddressofadestinationbysendinganetworkbroadcast.Thedestinationrespondstothebroadcastwithit’sMACaddress.

d）WhereanIPhostresolvesadestinationIPaddressbysendingabroadcastonthelocalnetworkandthedestinationhostrespondswithit’sIPaddress.

e）Thereisnosuchprocess.

7.[OxNx]Whichofthefollowingapplicationsrequirestheconnection-orientedlayerfourprotocol,TCP?

（Chooseallthatapply）

a）Telnet

b）FTP

c）TFTP

d）SNMP

e）noneoftheabove

8.[RxNx]WhichofthefollowingarelinkstateRoutingProtocols.

（Chooseallthatapply.）

a）IP

b）OSPF

c）RIP

d）EIGRP

e）IS-IS

9.[CxNx]Ofthefollowingcommands,identifythecorrectoneforclearingtheIParptableinmemoryoftherouter.

a）cleariparp-cache

b）cleariparp-table

c）cleararp-cache

d）cleararp-table

e）cleararp-ram

10.[CxNx]WhichofthefollowingexplainsthecorrectdefinitionofadministrativedistanceasitpertainstoCisco’sIOS?

a）Theprocessbywhichroutersselectanadministratorforanautonomoussystem.

b）Theprocesswherearouterwillselectthebestpathtoadestinationnetwork.

c）Theprocesswherearouterwilldistanceitselffromotherroutersduetoit’slackofadministrativeexperience.

d）Theprocesswherearouterwillprioritizeroutingprotocolssothatintheeventtworoutingprotocolshaveconflictingnexthopaddresses,theroutingprotocolwiththelowestadministrativedistancewilltakepriority.

e）Theprocesswherearouterwillprioritizeroutingprotocolssothatintheeventtworoutingprotocolshaveconflictingnexthopaddresses,theroutingprotocolwiththehighestadministrativedistancewilltakepriority.

11.[ExNx]Collisionsoccurwhen

a）multiplepacketsareplacedonaseriallink

b）multiplestationslistenfortrafficandtransmitatthesametime

c）whenmultipletokensareonaringsimultaneously

d）beaconingprocesstakesplace

12.[RINx]HowmanysubnetsarepossiblewithaClassCaddressandasubnetmaskof255.255.255.252?

a）32

b）30

c）60

d）62

e）4

13.[RxNx]Whatcommandswilllistallprotocolsthatarecurrentlybeingrouted?

（Chooseallthatapply.）

a）showipprotocol

b）showprotocol

c）showrun

d）showstart

e）Alloftheabove

14.[xxNx]Whichofthefollowingaretrueofaccesslists?

a）Accesslistshouldhaveatleastonepermitstatement.

b）Thelastconfiguredlineshouldalwaysbeapermitstatement.

c）Everyaccess-listwillimplicitlydenyalltraffic.

d）Access-listsareprocessedtopdown.

e）Alloftheabove.

15.[xxNx]Iftheaccess-groupcommandisconfiguredonaninterfaceandthereisnoaccess-listcreatedwhichofthefollowingismostcorrect?

a）Anerrormessagewillappear.

b）Thecommandwillbeexecutedanddenyalltrafficout.

c）Thecommandwillbeexecutedandpermitalltrafficout.

d）Thecommandwillbeexecutedandpermitalltrafficinandout.

e）Thecommandwillbeexecutedanddenyalltrafficinandout.

16.[xxNx]Whatistheresultofthecommand?

"access-list101permittcpany172.16.0.00.0.255.255established"

a）telnetsessionswillbepermittedregardlessofthesourceaddress

b）telnetsessionswillbedeniedregardlessofthesourceaddress

c）telnetsessionswillbedeniedifinitiatedfromanyaddressotherthan172.16.0.0network

d）telnetsessionswillbepermittedtothe172.16.0.0networkonly

e）telnetsessionswillbedeniedtothe172.16.0.0networkonly

17.[xxNx]Whichisgenerallytrueofthelocationofaccess-lists?

（Chooseallthatapply.）

a）Standardlistswillmostlikelybeplacedclosetothedestination.

b）Standardlistswillmostlikelybeplacedclosetothesource.

c）Extendedlistswillmostlikelybeplacedclosetothedestination.

d）Extendedlistswillmostlikelybeplacedclosetothesource.

e）Itdoesnotmatter.

18.[RxNx]Whichofthefollowingismostcorrect?

a）IPistoTCP.asIPXistoSPX.

b）RTMPistoAppletalkasIPRIPistoIP.

c）NLSPistoIPXasOSPFistoIP.

d）aistrue.

e）bistrue.

f）a&baretrue.

g）cistrue.

h）b&caretrue.

i）a,bandcaretrue.

19.[ExNx]IfHostAsendsapackettoHostBoverethernetandHostBisnotactive:

a）Thepacketwilltimeout.

b）ThepacketwillberemovedbyHostA.

c）TheNVRAMofHostBwillremovethepacket.

d）Thepacketwill"die"whenitreachestheterminator.

e）Thepacketwillberemovedbythetokenmonitor.

CodingKeyandInformation

Thefirstcharacterrepresentsthecategoryofquestion.

A-ATM

B-Bridging

C-Ciscospecific

E-Ethernet

F-Framerelay

H-HDLC

I-FDDI

N-ISDN

O-OSImodel

P-PPP

R-Routing

S-Switching

T-Tokenring

X-X.25

x-Notapplicable

Thesecondcharacterrepresentsprotocol.

A-Appletalk

B-BanyanVines

D-Decnet

I-IP

L-DialonDemand

N-NLSP

O-OSPF

X-IPX

x-NotApplicable

Thethirdcharacterrepresentsthecertificationthatthequestionwillhelpyoupreparefor.

N-CCNAExam#640-407

P-CCNP

AdvancedCiscoRouterConfiguration（ACRC）Exam640-403

CiscoLANSwitchConfiguration（CLSC）Exam#640-404

CiscoMonitoringandTroubleshootingDial-upServicesExam#640-405

CiscoInternetworkingTroubleshooting（CIT）Exam#640-406

D-CCDA&CCDP

CiscoDesignSpecialistExam#9E0-004

CiscoInternetworkDesign#640-025

Wewillreservethefourthcharacterforfutureuse.

Asanexample,whenyoucomeacrossaquestioncoded"BXDx",itsignifiesaquestionthatwillhelpyougaintheCCDAorCCDPcertification.

CCNA试题1-19答案

1.[OxNx]DuringaTFTPtransferusingCiscoRouterswhatisthenumericvalue,indecimal,ofthedestinationportfieldoftheUserDatagramProtocol（UDP）header?

a）96

b）47

c）arandomnumberabove1024

d）69

e）noneoftheabove

Answer

d）69

Hereisasamplingofotherportnumbersandtheapplicationtheyareassociatedwith.Thefirst8oftheseprotocolsareautomaticallyforwardedthroughtherouterbyusingthehelper-addresscommand

TrivialFileTransfer（TFTP）（port69）

DomainNameSystem（port53）

IEN-116NameServer（port42）

Timeservice（port37）

NetBIOSNameServer（port137）

NetBIOSDatagramServer（port138）

BootProtocol（BootP）clientandserverdatagrams（port67）

TACACSservice（port49）

SimpleMailTransferProtocol（25）

FileTransferProtocol（21）

SimpleNetworkManagementProtocol（161）

2.[CxNx]WhatisthestandardencapsulationmethodusedbyCiscoroutersfortheInternetProtocol（IP）onit’sEthernetinterfaces?

a）SNAP

b）ARPA

c）NOVELL-ETHER

d）DARPA

e）Ethernet_802.3

Answer

b）ARPA

SNAPisthedefaultencapsulationforatokenringinterfaceNOVELL-ETHERisthedefaultencapsulationforaipxinterface.

3.[CxNx]WhatwillbethecorrectcommandonaCiscoroutertosettheIPaddressofaninterfaceassumingyouareatthe"router（config-if）#"prompt?

a）ipaddress1.1.1.1255.255.255.0

b）ipaddress1.1.1.1

c）ip1.1.1.1

d）ip1.1.1.1255.255.255.0

e）noneoftheabove

Answer

a）ipaddress1.1.1.1255.255.255.0

Ifyouarenotintheconfigurationmode,theipaddresscanbesetbyusingthesetupmode.

ConfiguringinterfaceEthernet0/0:

Isthisinterfaceinuse?

[yes]:

ConfigureIPonthisinterface?

[yes]:

IPaddressforthisinterface[10.10.10.1]:

10.10.10.1

Numberofbitsinsubnetfield[16]:

16

ClassAnetworkis10.0.0.0,16subnetbits;maskis/24

Takenotewhenusingthesetupmodethemaskisconfiguredusingthenumberofsubnetbits.

4.[CxNx]WhichcommandswilldisplaytheIPaddressesofallinterfacesonaCiscoRouter?

（Chooseallthatapply）

a）showiproute

b）showipaddress

c）showipinterface

d）showinterface

e）displayipaddresses

Answer

c）showipinterface

d）showinterface

Examplesofeachofthesecommandsareshownbelow:

Router_A#shinte0/0

Ethernet0/0isup,lineprotocolisup

HardwareisAmdP2,addressis

0010.7b15.bd41

（bia0010.7b15.bd41）

Internetaddressis10.10.10.1/24

MTU1500bytes,BW10000Kbit,

DLY1000usec,

rely255/255,load1/255

EncapsulationARPA,loopbacknotset,