CCNA路由协议和概念第5单元Word格式文档下载.docx

CCNA路由协议和概念第5单元Word格式文档下载.docx

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2pointsforOption1

0pointsforanyotheroption

2

Thisitemreferencescontentfromthefollowingareas:

CCNAExploration:

NetworkFundamentals

∙5.3.4ARoute-ThePathtoaNetwork

WhatinformationisaddedduringencapsulationatOSILayer3?

sourceanddestinationMAC

sourceanddestinationapplicationprotocol

sourceanddestinationportnumber

sourceanddestinationIPaddress

2pointsforOption4

∙5.1.1NetworkLayer-CommunicationfromHosttoHost

3

Inaconnectionlesssystem,whichofthefollowingiscorrect?

Thedestinationiscontactedbeforeapacketissent.

Thedestinationisnotcontactedbeforeapacketissent.

Thedestinationsendsanacknowledgementtothesourcethatindicatesthepacketwasreceived.

Thedestinationsendsanacknowledgementtothesourcethatrequeststhenextpackettobesent.

2pointsforOption2

∙5.1.3TheIPv4Protocol-Connectionless

4

WhichIPpacketfieldwillpreventendlessloops?

type-of-service

identification

flags

time-to-live

headerchecksum

∙5.1.7IPv4PacketHeader

5

Whichportionofthenetworklayeraddressdoesarouterusetoforwardpackets?

hostportion

broadcastaddress

networkportion

gatewayaddress

2pointsforOption3

∙5.2.5HowDoWeSeparateHostsIntoNetworks?

-HierarchicalAddressing

6

Refertotheexhibit.Usingthenetworkintheexhibit,whatwouldbethedefaultgatewayaddressforhostAinthe192.133.219.0network?

192.135.250.1

192.31.7.1

192.133.219.0

192.133.219.1

∙5.3.1DeviceParameters-SupportingCommunicationOutsideOurNetwork

7

Ifthedefaultgatewayisconfiguredincorrectlyonthehost,whatistheimpactoncommunications?

Thehostisunabletocommunicateonthelocalnetwork.

Thehostcancommunicatewithotherhostsonthelocalnetwork,butisunabletocommunicatewithhostsonremotenetworks.

Thehostcancommunicatewithotherhostsonremotenetworks,butisunabletocommunicatewithhostsonthelocalnetwork.

Thereisnoimpactoncommunications.

8

Whatisthepurposeofadefaultgateway?

physicallyconnectsacomputertoanetwork

providesapermanentaddresstoacomputer

identifiesthenetworktowhichacomputerisconnected

identifiesthelogicaladdressofanetworkedcomputeranduniquelyidentifiesittotherestofthenetwork

identifiesthedevicethatallowslocalnetworkcomputerstocommunicatewithdevicesonothernetworks

2pointsforOption5

9

Whattypeofroutingusesinformationthatismanuallyenteredintotheroutingtable?

dynamic

interior

static

standard

∙5.4.2StaticRouting

10

WhenthedestinationnetworkisnotlistedintheroutingtableofaCiscorouter,whataretwopossibleactionsthattheroutermighttake?

（Choosetwo.）

TheroutersendsanARPrequesttodeterminetherequirednexthopaddress.

Therouterdiscardsthepacket.

TherouterforwardsthepackettowardthenexthopindicatedintheARPtable.

Therouterforwardsthepackettotheinterfaceindicatedbythesourceaddress.

Therouterforwardsthepacketouttheinterfaceindicatedbythedefaultrouteentry.

Option2andOption5arecorrect.

1pointforeachcorrectoption.

0pointsifmoreoptionsareselectedthanrequired.

∙5.3.7PacketForwarding-MovingthePacketTowarditsDestination

11

Whatarethekeyfactorstoconsiderwhengroupinghostsintoacommonnetwork?

（Choosethree.）

gateways

purpose

physicaladdressing

softwareversion

geographiclocation

ownership

Option2,Option5,andOption6arecorrect.

∙5.2.1Networks-SeparatingHostsintoCommonGroups

12

Whatisacomponentofaroutingtableentry?

theMACaddressoftheinterfaceoftherouter

thedestinationLayer4portnumber

thedestinationhostaddress

thenext-hopaddress

∙5.3.5TheDestinationNetwork

13

Whichintermediarydevicescouldbeusedtoimplementsecuritybetweennetworks?

router

hub

switch

firewall

accesspoint

bridge

Option1andOption4arecorrect.

∙5.2.3WhySeparateHostsIntoNetworks?

-Security

14

Whatarethreecommonproblemswithalargenetwork?

toofewbroadcasts

performancedegradation

securityissues

limitedmanagementresponsibility

hostidentification

protocolcompatibility

Option2,Option3,andOption5arecorrect.

∙5.2.2WhySeparateHostsIntoNetworks?

-Performance

15

Refertotheexhibit.Alldevicesshownintheexhibithavefactorydefaultsettings.Howmanybroadcastdomainsarerepresentedinthetopologythatisshown?

3

4

5

7

8

11

16

Whichthreestatementsaretrueaboutroutesandtheiruse?

Ifnoroutetothedestinationnetworkisfound,thepacketisreturnedtothepreviousrouter.

Ifthedestinationnetworkisdirectlyconnected,therouterforwardsthepackettothedestinationhost.

Ifmultiplenetworkentriesexistforthedestinationnetwork,themostgeneralrouteisusedtoforwardthepacket.

Ifnorouteexistsforthedestinationnetworkandadefaultrouteispresent,thepacketisforwardedtothenext-hoprouter.

Iftheoriginatinghosthasadefaultgatewayconfigured,thepacketforaremotenetworkcanbeforwardedusingthatroute.

Ifahostdoesnothavearoutemanuallyconfiguredforthedestinationnetwork,thehostwilldropthepacket.

Option2,Option4,andO