CCNA题库.docx

CCNA题库.docx

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CCNA题库

CCNA题库

QUESTION1

WhichtwofeaturesdidWPAv1addtoaddresstheinherentweaknessesfoundinWEP?

（Choosetwo.）

A.

astrongerencryptionalgorithm

B.

keymixingusingtemporalkeys

C.

sharedkeyauthentication

D.

ashorterinitializationvector

E.

perframesequencecounters

Answer:

BE

Section:

（none）

Explanation/Reference:

QUESTION2

WhichtwoEthernetfiber-opticmodessupportdistancesofgreaterthan550meters?

A.

1000BASE-CX

B.

100BASE-FX

C.

1000BASE-ZX

D.

1000BASE-SX

E.

1000BASE-LX

Answer:

CE

Section:

（none）

Explanation/Reference:

QUESTION3

Whatcouldbepossiblecausesforthe“Serial0/0isdown”interfacestatus?

（Choosetwo.）

A.

alayer1problemexists

B.

thebandwidthissettoolow

C.

aprotocolmismatchexists

D.

anincorrectcableisbeingused

E.

thereisanincorrectIPaddressontheSerial0/0interface

Answer:

AD

Section:

（none）

Explanation/Reference:

QUESTION4

Bothswitchesareusingadefaultconfiguration.WhichtwodestinationaddresseswillHost4usetosenddatatoHost1?

（Choosetwo.）

A.

theIPaddressofHost1

B.

theIPaddressofHost4

C.

theMACaddressofHost1

D.

theMACaddressofHost4

E.

theMACaddressoftheFa0/0interfaceoftheR1router

F.

theMACaddressoftheFa0/1interfaceoftheR1router

Answer:

AF

Section:

（none）

Explanation/Reference:

QUESTION5

Whattwothingswillarouterdowhenrunningadistancevectorroutingprotocol?

（Choosetwo.）

A.

sendperiodicupdatesregardlessoftopologychanges.

B.

sendentireroutingtabletoallroutersintheroutingdomain.

C.

usetheshortest-pathalgorithmtothedeterminebestpath.

D.

updatetheroutingtablebasedonupdatesfromtheirneighbors.

E.

maintainthetopologyoftheentirenetworkinitsdatabase.

Answer:

AD

Section:

（none）

Explanation/Reference:

QUESTION6

WhataretwocharacteristicsofRIPv2?

（Choosetwo.）

A.

classfulroutingprotocol.

B.

variable-lengthsubnetmasks.

C.

manualroutesummarization.

D.

broadcastaddressing.

E.

usesSPFalgorithmtocomputepath.

Answer:

BC

Section:

（none）

Explanation/Reference:

QUESTION7

WhataretwocharacteristicsofFrameRelaypoint-to-pointsubinterfaces?

（Choosetwo.）

A.

theyrequireauniquesubnetwithinaroutingdomain.

B.

theycreatesplit-horizonissues.

C.

theyemulateleasedlines.

D.

theyrequiretheuseofNBMAoptionswhenusingOSPF.

E.

theyareidealforfull-meshtopologies.

Answer:

AC

Section:

（none）

Explanation/Reference:

QUESTION8

Awirelessclientcannotconnecttoan802.11b/gBSSwithab/gwirelesscard.TheclientsectionoftheaccesspointdoesnotlistanyactiveWLANclients.Whatisapossiblereasonforthis?

A.

theclient’sIPaddressisonthewrongsubnet.

B.

theincorrectchannelisconfiguredontheclient.

C.

theSSIDisconfiguredincorrectlyontheclient.

D.

theclienthasanincorrectpre-sharedkey.

Answer:

C

Section:

（none）

Explanation/Reference:

QUESTION9

WhatoccursonaFrameRelaynetworkwhentheCIRisexceeded?

A.

allUDPtrafficismarkeddiscardeligibleandaBECNissent.

B.

alltrafficexceedingtheCIRismarkeddiscardeligible.

C.

allTCPtrafficismarkeddiscardeligibleandaBECNissent.

D.

allTCPtrafficismarkeddiscardeligible.

Answer:

B

Section:

（none）

Explanation/Reference:

QUESTION10

Anetworkadministratormustconfigure200switchportstoaccepttrafficfromonlythecurrentlyattachedhostdevices.WhatwouldbethemostefficientwaytoconfigureMAC-levelsecurityonalltheseports?

A.

Haveenduserse-mailtheirMACaddresses.Telnettotheswitchtoentertheswitchport-port

securitymac-addresscommand.

B.

Usetheswitchportport-securityMACaddressstickycommandonalltheswitchports

thathaveenddevicesconnectedtothem.

C.

VisuallyverifytheMACaddressesandthentelnettotheswitchestoentertheswitchport-port

securitymac-addresscommand.

D.

Useshowmac-address-tabletodeterminetheaddressesthatareassociatedwitheachport

andthenenterthecommandsoneachswitchforMACaddressport-security.

Answer:

B

Section:

（none）

Explanation/Reference:

QUESTION11

WhatisthedifferencebetweenaCSU/DSUandamodem?

A.

ACSU/DSUconvertsdigitalsignalsfromaroutertoaphoneline;amodemconvertsanalogsignals

fromaroutertoaphoneline.

B.

ACSU/DSUconvertsdigitalsignalsfromaroutertoaleasedline;amodemconvertsdigitalsignals

fromaroutertoaphoneline.

C.

ACSU/DSUconvertsanalogsignalsfromaroutertoaphoneline;amodemconvertsdigitalsignals

fromaroutertoaleasedline.

D.

ACSU/DSUconvertsanalogsignalsfromaroutertoaleasedline;amodemconvertsanalogsignals

fromaroutertoaleasedline.

Answer:

B

Section:

（none）

Explanation/Reference:

QUESTION12

WhichthreeoptionsarevalidWANconnectivitymethods?

（Choosethree.）

A.

L2TPv3

B.

ATM

C.

WAP

D.

PPP

E.

HDLC

Answer:

BDE

Section:

（none）

Explanation/Reference:

QUESTION13

WhichprotocolsarefoundinthenetworklayeroftheOSIreferencemodelandareresponsibleforpathdeterminationandtrafficswitching?

A.

WAN

B.

network

C.

routing

D.

LAN

Answer:

C

Section:

（none）

Explanation/Reference:

QUESTION14

Datatransferisslowbetweenthesourceanddestination.ThequalityofservicerequestedbythetransportlayerintheOSIreferencemodelisnotbeingmaintained.Tofixthisissue,atwhichlayershouldthetroubleshootingprocessbegin?

A.

network

B.

presentation

C.

session

D.

physical

E.

transport

Answer:

A

Section:

（none）

Explanation/Reference:

QUESTION15

WhichlayerintheOSIreferencemodelisresponsiblefordeterminingtheavailabilityofthereceivingprogramandcheckingtoseeifenoughresourcesexistforthatcommunication?

A.

transport

B.

presentation

C.

network

D.

session

E.

application

Answer:

E

Section:

（none）

Explanation/Reference:

QUESTION16

AcompanyimplementsvideoconferencingoverIPontheirEthernetLAN.Theusersnoticethatthenetworkslowsdown,andthevideoeitherstuttersorfailscompletely.Whatisthemostlikelyreasonforthis?

A.

modulation

B.

packetswitchingexchange（PSE）

C.

reliabletransportprotocol（RTP）

D.

qualityofservice（QoS）

E.

minimumcellrate（MCR）

Answer:

D

Section:

（none）

Explanation/Reference:

QUESTION17

Whatmustbesetcorrectlywhenconfiguringaserialinterfacesothathigher-levelprotocolscalculatethebestroute?

A.

delay

B.

bandwidth

C.

load

D.

reliability

Answer:

B

Section:

（none）

Explanation/Reference:

QUESTION18

Whenconfiguringaserialinterfaceonarouter,whatisthedefaultencapsulation?

A.

Frame-relay

B.

HDLC

C.

Atm-Dxi

D.

LAPB

E.

PPP

Answer:

B

Section:

（none）

Explanation/Reference:

QUESTION19

WhichcommanddisplaysCPUutilization?

A.

showprotocols

B.

showprocess

C.

showversion

D.

showsystem

Answer:

B

Section:

（none）

Explanation/Reference:

QUESTION20

Whichcommandisusedtodebugapingcommand?

A.

debugtcp

B.

debugicmp

C.

debugipicmp

D.

debugpacket

Answer:

C

Section:

（none）

Explanation/Reference:

QUESTION21

WhichcommandisusedtoseethepathtakenbypacketsacrossanIPnetwork?

A.

showiproute

B.

traceroute

C.

showroute

D.

traceiproute

Answer:

B

Section:

（none）

Explanation/Reference:

QUESTION22

WhichcommandwouldyouconfiguregloballyonaCiscorouterthatwouldallowyoutoviewdirectlyconnectedCiscodevices?

A.

cdpenable

B.

cdprun

C.

enablecdp

D.

runcdp

Answer:

B

Section:

（none）

Explanation/Reference:

QUESTION23

IfIProutingisenabled,whichtwocommandssetthegatewayoflastresorttothedefaultgateway?

（Choosetwo.）

A.

iproute0.0.0.00.0.0.0172.16.2.1

B.

ipdefault-route0.0.0.00.0.0.0172.16.2.1

C.

ipdefault-network0.0.0.0

D.

iproute172.16.2.10.0.0.00.0.0.0

E.

ipdefault-gateway0.0.0.0

Answer:

AC

Section:

（none）

Explanation/Reference:

QUESTION24

Whichcommandisusedtoconfigureadefaultroute?

A.

iproute172.16.1.0255.255.255.00.0.0.0

B.

iproute0.0.0.00.0.0.0172.16.2.1

C.

iproute0.0.0.0255.255.255.0172.16.2.1

D.

iproute172.16.1.0255.255.255.0172.16.2.1

Answer:

B

Section:

（none）

Explanation/Reference:

QUESTION25

Asystemadministratortypesthecommandtochangethehostnameofarouter.WhereontheCiscoIFSisthatchangestored?

A.

NVRAM

B.

FLASH

C.

RAM

D.

ROM

E.

PCMCIA

Answer:

C

Section:

（none）

Explanation/Reference:

QUESTION26

WhichcommandisusedtoloadaconfigurationfromaTFTPserverandmergetheconfigurationintoRAM?

A.

copyTFTP:

running-config

B.

copyrunning-config:

TFTP:

C.

copyTFTP:

startup-config

D.

copystartup-config:

TFTP:

Answer:

A

Section:

（none）

Explanation/Reference:

QUESTION27

WhichcommandisusedtocopytheconfigurationfromRAMintoNVRAM?

A.

copystartup-config:

running-config:

B.

copyrunning-configstartup-config

C.

copystartupconfigrunningconfig

D.

copyrunningconfigstartupconfig

E.

writeterminal

Answer:

B

Section:

（none）

Explanation/Reference:

QUESTION28

YourISPhasgivenyoutheaddress223.5.14.6/29toassigntoyourrouter’sinterface.Theyhavealsogivenyouthedefaultgatewayaddressof223.5.14.7.Afteryouhaveconfiguredtheaddress,therouterisunabletopinganyremotedevices.Whatispreventingtherouterfrompingingremotedevices?

A.

thedefaultgatewayisnotanaddressonthissubnet.

B.

theIPaddressisthebroadcastaddressforthissubnet.

C.

thedefaultgatewayisthebroadcastaddressforthissubnet.

D.

theIPaddressisan