CCNA路由协议和概念第9单元.docx

CCNA路由协议和概念第9单元.docx

《CCNA路由协议和概念第9单元.docx》由会员分享，可在线阅读，更多相关《CCNA路由协议和概念第9单元.docx（22页珍藏版）》请在冰豆网上搜索。

CCNA路由协议和概念第9单元

1

窗体顶端

Convertthebinarynumber10111010intoitshexadecimalequivalent.Selectthecorrectanswerfromthelistbelow.

85

90

BA

A1

B3

1C

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption3

0pointsforanyotheroption

2

Thisitemreferencescontentfromthefollowingareas:

CCNAExploration:

NetworkFundamentals

∙9.3.3HexadecimalNumberingandAddressing

2

窗体顶端

Whichofthefollowingdescribeinterframespacing?

（Choosetwo.）

theminimuminterval,measuredinbit-times,thatanystationmustwaitbeforesendinganotherframe

themaximuminterval,measuredinbit-times,thatanystationmustwaitbeforesendinganotherframe

the96-bitpayloadpaddinginsertedintoaframetoachievealegalframesize

the96-bitframepaddingtransmittedbetweenframestoachievepropersynchronization

thetimeallowedforslowstationstoprocessaframeandprepareforthenextframe

themaximumintervalwithinwhichastationmustsendanotherframetoavoidbeingconsideredunreachable

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

Option1andOption5arecorrect.

1pointforeachcorrectoption.

0pointsifmoreoptionsareselectedthanrequired.

2

Thisitemreferencescontentfromthefollowingareas:

CCNAExploration:

NetworkFundamentals

∙9.4.4InterframeSpacingandBackoff

3

窗体顶端

WhenacollisionoccursinanetworkusingCSMA/CD,howdohostswithdatatotransmitrespondafterthebackoffperiodhasexpired?

Thehostsreturntoalisten-before-transmitmode.

Thehostscreatingthecollisionhaveprioritytosenddata.

Thehostscreatingthecollisionretransmitthelast16frames.

Thehostsextendtheirdelayperiodtoallowforrapidtransmission.

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption1

0pointsforanyotheroption

2

Thisitemreferencescontentfromthefollowingareas:

CCNAExploration:

NetworkFundamentals

∙9.4.2CSMA/CD-TheProcess

4

窗体顶端

AfteranEthernetcollision,whenthebackoffalgorithmisinvoked,whichdevicehasprioritytotransmitdata?

thedeviceinvolvedinthecollisionwiththelowestMACaddress

thedeviceinvolvedinthecollisionwiththelowestIPaddress

anydeviceinthecollisiondomainwhosebackofftimerexpiresfirst

thosethatbegantransmittingatthesametime

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption3

0pointsforanyotheroption

2

Thisitemreferencescontentfromthefollowingareas:

CCNAExploration:

NetworkFundamentals

∙9.4.4InterframeSpacingandBackoff

5

窗体顶端

WhichofthefollowingisadrawbackoftheCSMA/CDaccessmethod?

Collisionscandecreasenetworkperformance.

Itismorecomplexthannon-deterministicprotocols.

Deterministicmediaaccessprotocolsslownetworkperformance.

CSMA/CDLANtechnologiesareonlyavailableatslowerspeedsthanotherLANtechnologies.

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption1

0pointsforanyotheroption

2

Thisitemreferencescontentfromthefollowingareas:

CCNAExploration:

NetworkFundamentals

∙9.6.1LegacyEthernet-UsingHubs

6

窗体顶端

Refertotheexhibit.Theswitchandworkstationareadministrativelyconfiguredforfull-duplexoperation.Whichstatementaccuratelyreflectstheoperationofthislink?

Nocollisionswilloccuronthislink.

Onlyoneofthedevicescantransmitatatime.

Theswitchwillhavepriorityfortransmittingdata.

Thedeviceswilldefaultbacktohalfduplexifexcessivecollisionsoccur.

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption1

0pointsforanyotheroption

2

Thisitemreferencescontentfromthefollowingareas:

CCNAExploration:

NetworkFundamentals

∙9.6.2Ethernet-UsingSwitches

7

窗体顶端

WhydohostsonanEthernetsegmentthatexperienceacollisionusearandomdelaybeforeattemptingtotransmitaframe?

Arandomdelayisusedtoensureacollision-freelink.

Arandomdelayvalueforeachdeviceisassignedbythemanufacturer.

Astandarddelayvaluecouldnotbeagreeduponamongnetworkingdevicevendors.

Arandomdelayhelpspreventthestationsfromexperiencinganothercollisionduringthetransmission.

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption4

0pointsforanyotheroption

2

Thisitemreferencescontentfromthefollowingareas:

CCNAExploration:

NetworkFundamentals

∙9.4.2CSMA/CD-TheProcess

8

窗体顶端

Inthegraphic,HostAhasreached50%completioninsendinga1KBEthernetframetoHostDwhenHostBwishestotransmititsownframetoHostC.WhatmustHostBdo?

HostBcantransmitimmediatelysinceitisconnectedonitsowncablesegment.

HostBmustwaittoreceiveaCSMAtransmissionfromthehub,tosignalitsturn.

HostBmustsendarequestsignaltoHostAbytransmittinganinterframegap.

HostBmustwaituntilitiscertainthatHostAhascompletedsendingitsframe.

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption4

0pointsforanyotheroption

2

Thisitemreferencescontentfromthefollowingareas:

CCNAExploration:

NetworkFundamentals

∙9.4.2CSMA/CD-TheProcess

9

窗体顶端

EthernetoperatesatwhichlayersoftheOSImodel?

（Choosetwo.）

Networklayer

Transportlayer

Physicallayer

Applicationlayer

Sessionlayer

Data-linklayer

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

Option3andOption6arecorrect.

1pointforeachcorrectoption.

0pointsifmoreoptionsareselectedthanrequired.

2

Thisitemreferencescontentfromthefollowingareas:

CCNAExploration:

NetworkFundamentals

∙9.1.3LogicalLinkControl-ConnectingtotheUpperLayers

10

窗体顶端

WhatdoestheIEEE802.2standardrepresentinEthernettechnologies?

MACsublayer

Physicallayer

LogicalLinkControlsublayer

Networklayer

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

2pointsforOption3

0pointsforanyotheroption

2

Thisitemreferencescontentfromthefollowingareas:

CCNAExploration:

NetworkFundamentals

∙9.1.3LogicalLinkControl-ConnectingtotheUpperLayers

11

窗体顶端

WhichstatementscorrectlydescribeMACaddresses?

（Choosethree.）

dynamicallyassigned

copiedintoRAMduringsystemstartup

layer3address

containsa3byteOUI

6byteslong

32bitslong

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

Option2,Option4,andOption5arecorrect.

1pointforeachcorrectoption.

0pointsifmoreoptionsareselectedthanrequired.

3

Thisitemreferencescontentfromthefollowingareas:

CCNAExploration:

NetworkFundamentals

∙9.3.2TheEthernetMACAddress

12

窗体顶端

Refertotheexhibit.Host_AisattemptingtocontactServer_B.WhichstatementscorrectlydescribetheaddressingHost_Awillgenerateintheprocess?

（Choosetwo.）

ApacketwiththedestinationIPofRouter_B.

AframewiththedestinationMACaddressofSwitch_A.

ApacketwiththedestinationIPofRouter_A.

AframewiththedestinationMACaddressofRouter_A.

ApacketwiththedestinationIPofServer_B.

AframewiththedestinationMACaddressofServer_B.

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

Option4andOption5arecorrect.

1pointforeachcorrectoption.

0pointsifmoreoptionsareselectedthanrequired.

2

Thisitemreferencescontentfromthefollowingareas:

CCNAExploration:

NetworkFundamentals

∙9.3.4AnotherLayerofAddressing

13

窗体顶端

HostAhasanIPaddressof172.16.225.93,amaskof255.255.248.0,andadefaultgatewayof172.16.224.1.HostAneedstosendapackettoanewhostwhoseIPis172.16.231.78.HostAperformstheANDingoperationonitsaddressandsubnetmask.Whattwothingswilloccur?

（Choosetwo.）

HostAwillgetaresultof172.16.224.0fromtheANDprocess.

HostAwillsendontothemediaabroadcastframethatcontainsthepacket.

HostAwillbroadcastanARPrequestfortheMACofthehost172.16.231.78.

HostAwillchangethedestinationIPofthepacketto172.16.224.1andforwardthepacket.

HostAwillencapsulatethepacketinaframewithadestinationMACthatistheMACaddressassociatedwith172.16.224.1.

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

Option1andOption3arecorrect.

1pointforeachcorrectoption.

0pointsifmoreoptionsareselectedthanrequired.

2

Thisitemreferencescontentfromthefollowingareas:

CCNAExploration:

NetworkFundamentals

∙9.7.1TheARPProcess-MappingIPtoMACAddresses

14

窗体顶端

WhichtwofeaturesmakeswitchespreferabletohubsinEthernet-basednetworks?

（Choosetwo.）

reductionincross-talk

minimizingofcollisions

supportforUTPcabling

divisionintobroadcastdomains

increaseinthethroughputofcommunications

窗体底端

Observable

Description

MaxValue

1

correctnessofresponse

Option2andOption5arecorrect.

1pointforeachcorrectoption.

0pointsifmoreoptionsareselectedthanrequired.

2