CCNA26english.docx
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CCNA26english.docx
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CCNA26english
Whatisthepurposeofaroutingprotocol?
ItisusedtobuildandmaintainARPtables.
Itprovidesamethodforsegmentingandreassemblingdatapackets.
Itallowsanadministratortodeviseanaddressingschemeforthenetwork.
Itallowsaroutertoshareinformationaboutknownnetworkswithotherrouters.
Itprovidesaprocedureforencodinganddecodingdataintobitsforpacketforwarding.
Whyisfastconvergence收敛desirable适合innetworksthatusedynamicroutingprotocols?
Routerswillnotallowpacketstobeforwardeduntilthenetworkhasconverged.
Hostsareunabletoaccesstheirgatewayuntilthenetworkhasconverged.
Routersmaymakeincorrectforwardingdecisionsuntilthenetworkhasconverged.在收敛之前,路由器可能做出不正确的转发。
Routerswillnotallowconfigurationchangestobemadeuntilthenetworkhasconverged.
Inwhichsituationwouldacompanyregister注册foritsownautonomous自治systemnumber(ASN)?
whenthecompany'sISPaddsconnectionpointstotheInternet
whenadditionalroutersareaddedtothecorporateinternetwork
whenmorethanoneinteriorroutingprotocolisused
whenthecompanyusestwoormoreISPs
Whattermreferstoagroupofnetworksthatusesthesameinternalroutingpoliciesandiscontrolledbyasingleadministrativeauthority?
被一个管理机构控制
Internet
intranet
virtualprivatenetwork
autonomoussystem自治系统
Whichprotocolisanexterior外部routingprotocol?
BGP
EIGRP
OSPF
RIP
WhatdeviceenablesanISPtoconnectwithotherISPstotransferdata?
bordergatewayrouter边界网关路由
DSLAM
webserver
interiorrouter
WhichpartofanIPpacketdoestherouterusetomakeroutingdecisions决定?
sourceIPaddress
sourceMACaddress
destinationIPaddress
destinationMACaddress
WhatstatementistrueregardinganASnumber自治系统号?
ASnumbersarecontrolled控制andregisteredforInternetuse.
InteriorroutingprotocolsrequireregisteredASnumbers.
ISPsrequireallcustomerstohaveregisteredASnumbers.
AllroutersatanISPmustbeassignedthesameASnumber.
Whichroutingprotocolisusedtoexchange交换databetweentwodifferentISPs?
BGP
EIGRP
OSPF
RIPv2
Considerthisroutingtableentry:
R172.16.1.0/24[120/1]via200.1.1.100:
00:
27Serial0/1
Whattypeofrouteisthis?
astaticroute
adefaultroute
aRIProute
anOSPFroute
anEIGRProute
adirectly-connectedroute
Refertotheexhibit.IfallroutersarerunningRIPandnetwork10.0.0.0goesdown断开,whenwillR3learnthatthenetworkisnolongeravailable?
in30seconds
in60seconds
in90seconds
immediately立即
WhatinformationisincludedinRIPv2routingupdatesthatisnotincludedinRIPv1updates?
metric
subnetmask
areaidentification
hopcount
autonomoussystemnumber
Whattwotypesofbusinesseswouldbenefitfromregistering注册astheirownautonomoussystems拥有自己的自治系统?
(Choosetwo.)
ahomebusinesswithoneISPconnection
aglobalbusinesswithconnectionstomultiplelocalISPs多个本地ISP
amedium-sizednationwidebusinesswithInternetconnectivitythroughdifferentISPs
alargeenterprisewithtwoconnectionstothesameISP
asmallISPwithasingleInternetconnectionthroughalargerISP
Whichtwostatementsdescribestaticroutes?
(Choosetwo.)
Theyarecreatedininterfaceconfigurationmode接口配置模式.
Theyrequiremanualreconfigurationtoaccommodatenetworkchanges.当数据改变时,重新手动配置
Theyautomaticallybecomethedefaultgatewayoftherouter.
TheyareidentifiedintheroutingtablewiththeprefixS在路由表中以S开头标示
Theyareautomaticallyupdatedwheneveraninterfaceisreconfiguredorshutdown.
Whatisthedifferencebetweeninteriorandexteriorroutingprotocols?
内部外部路由协议的的区别
ExteriorroutingprotocolsareonlyusedbylargeISPs.InteriorroutingprotocolsareusedbysmallISPs.
InteriorroutingprotocolsareusedtorouteontheInternet.Exteriorroutingprotocolsareusedinsideorganizations.
Exteriorroutingprotocolsareusedtoadministerasingleautonomoussystem.Interiorroutingprotocolsareusedtoadministerseveraldomains.
Interiorroutingprotocolsareusedtocommunicatewithinasingle单个autonomoussystem.Exteriorroutingprotocolsareusedtocommunicatebetweenmultipleautonomoussystems.
Refertotheexhibit.Whichconfigurationcommand项配置命令orcommandscontributed建立totheoutputthatisshown?
routerA(config-router)#noversion2
routerA(config)#interfacefa0/0
routerA(config-if)#ipaddress172.19.0.0255.255.0.0
routerA(config-router)#network192.168.3.0
routerA(config)#noipdefault-gateway
Refertotheexhibit.AlloftheroutersarerunningRIP.TherearetwopathsfromrouterAtothe192.168.3.0network.BasedontheoutputoftheshowiproutecommandonrouterA,whichroutewasenteredintotheroutingtableandwhy?
A,B,C,Dbecauseithasthelowestadministrativedistance
A,E,F,G,Dbecauseithasthelowestadministrativedistance
A,B,C,Dbecauseithasthelowestmetric最短距离
A,E,F,G,Dbecauseithasthelowestmetric
Whatisthepurposeofthenetworkcommand使用network命令有何作用inconfiguringRIP?
tospecifywhetherRIPv1orRIPv2willbeusedastheroutingprotocol
toallowtheroutertomonitorRIPupdatesthatoccuronotherrouters
toidentifythedirectlyconnectednetworksthatwillbeannouncedinRIPupdates宣布直连路由
toconfiguretheIPaddressonaninterfacethatwilluseRIP
toidentifyalloftheremotenetworksthatshouldbereachablefromtherouter
Refertotheexhibit.Ifconnectivitybetweenthetwohostsismaintained,whatisthemaximumnumberofRIProutersthatcanbeinthepathfromHostAtoHostB?
在两个主机之间最多主机是多少
14
15
16
17
Refertotheexhibit.RouterBreceivesapacketwithadestinationaddressof10.16.1.97WhatwillrouterBdo?
dropthepacket
forwardthepacketviatherouteto10.16.1.0
forwardthepacketviatherouteto10.16.1.64
usethedefaultroute使用默认路由
Anetworkisconvergedandtheroutingtablesarecomplete.Whenapacketneedstobeforwarded,whatisthefirstcriterionusedtodeterminethebestpathintheroutingtable?
theroutewiththesmallestAD
theroutewiththelongestaddressandmaskmatchtothedestination使用最长目的地址和子网掩码匹配原则
theroutewiththehighestbandwidth
theroutewiththebestcombinationofADandlowestcost
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