CCNA考试自测题2新

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25)WhichstatementistrueofWinSock(下面对WinSock的哪一句陈述是正确的)？

A.ItisaMACapplication

B.Itrepresentsagraphicaluserinterface

C.Itrepresentsanetworklayer

D.ItprovidesthemeansforsharinganInternetconnectionbetweenmultipleIPprotocolsuiteutilities

26)WhichstatementistrueofTLI(下面关于TLI的哪一句陈述是正确的)？

A.ItisalayerintheOSImodel

B.ItisalayerintheTCP/IPmodel

C.ItisaSystemVAPI

D.ItispartoftheUNIXKernel

27)WhichstatementistrueofWindowsNameServer(WINS)(下面对于Windows命名服务器(WINS)的陈述中，哪一句是正确的)？

A.Itisaprotocol

B.Itprovidescapabilityfornameresolution

C.Itisanetworklayer

D.Itisaproprietarynameserver

E.A,B,andDonly

F.BandDonly

28)ICMP、IP、ARPandRARPoftheIPprotocolsuitemapto(IP协议套件的ICMP、IP、ARP和RARP映射到)：

A.OSIlayers1and2

B.OSIlayer5

C.OSIlayer3

D.OSIlayer2

29)Whichlayerismostimportantinprovidingreliabledataexchangebetweentwosystems(在两个系统之间供应牢靠的数据交换中，哪一层是最重要的)？

A.Physicallayer

B.Datalinklayer

C.Sessionlayer

D.Transportlayer

30)WhichofthefollowingdoesTCPprovide(TCP供应了下面的哪一个功能)？

A.Unreliabledatastream

B.Connectionlessvirtualcircuit

C.Flowcontrol

D.Structuredbytestreammovement

31)Ofthefollowing,whichfieldisnotapartoftheTCPheader(在下面各项中，哪一个字段不是TCP报头的一部分)？

A.Subnetmask

B.Sequencenumber

C.Dataoffset

D.Destinationport

32)WhatisthesequencenumberinaTCPheaderusedfor(在TCP报头中的挨次号的作用是什么)？

A.Acknowledgments

B.Reorderingoftheoctetsreceived

C.Rejectingduplicateoctets

33)VariableslidingwindowsprovideanexplicitmechanismfornotifyingTCPifanintermediatenode(forexample,arouter)becomescongested(在中间节点，例如一个路由器拥塞的状况下，可变滑动窗口供应了通知TCP的显式机制)。

A.True

B.False

34)WhichofthefollowingparametersisnotapartofUDPheader(下面的哪一个参数不是UDP报头的一部分)？

A.Sourceport

B.Urgentpointer

C.Checksum

D.Length

E.Destinationport

35)WhenarouterhasbeenconfiguredforUDPflooding,thesourceaddressmightchange,butthedestinationaddresswillnotchangeasthedatagrampropagatesthroughthenetwork(当一个路由器已经配置为UDP泛洪时，当数据报在网络上传播的过程中，源地址可能转变，但是目的地址不会转变)？

A.True

B.False

36)Thespanning-treealgorithmallows(生成树算法允许)：

A.Forwardingofpacketswithnocontrol

B.Forwardingofbroadcaststoaninterfacewhichalreadyhasreceivedthebroadcast

C.Preventionofduplicationofforwardingofpackets

D.AandBonly

37)IPhelperaddressesareaformof______________addressingandrequirethecommandspecificationof_________oneveryinterfacereceivingbroadcaststhatneedtobeforwarded(IP帮助地址是一种什么类型的寻址方法，在每一个接收到需要转发的广播接口上需要什么命令说明)？

A.Static/IPheaderaddress

B.Dynamic/IPforward-protocolUDP

C.Dynamic/IPforward-protocolTCP

38)Whichofthefollowingprotocolsprovideaddressresolution(下面的哪一个协议供应了地址解析)？

A.ICMP

B.RARP

C.IP

D.UDP

E.TCP

39)IPisdescribedasanunreliablemechanismbecauseitdoesnotguaranteedelivery(IP被认为是不行靠的机制，由于它不保证发送)。

A.True

B.False

40)WhatdoesfragmentationinTCP/IPrepresent(在TCP/IP中的分段代表什么)？

A.Segmentingofdatagramsinto53-bytepacketsforATMapplications

B.Divisionoflargerdatagramsintoconvenientsizepackets

C.Aprocessthatoccursonarouter

D.A,B,andC

E.AandConly

F.BandConly

41)WhichofthefollowingstatementsistrueofARP(下面对ARP的陈述中，哪一个是正确的)？

A.ItmakesaMACaddresslogicallyindependentofthephysicalhardware

B.ItmakesitnecessaryfortheadministratortophysicallymanagetheMACaddressofeachNIC

C.Itintegratesroutingfunctionwiththephysicalanddatalinklayers

D.Itroutespacketsbasedondestinationhost,notondestinationnetwork

42)Ahost’sARPcacheisgoodforeveronceithasbeencreated(一个主机的ARP高速缓存一旦创建，则它永久工作良好)。

A.True

B.False

43)ARPisabroadcastprotocol,andARPcachingisusedbecausebroadcastsareexpensive(ARP是一个广播协议，并且使用了ARP高速缓存，缘由是广播太昂贵了)。

A.True

B.False

44)ReverseAddressResolutionProtocol(RARP)istermed“reverse”because(反向地址解析协议(RARP)中的“反向”的含义是)：

A.ItisusedbythesystemthatknowsitsIPaddressbutdoesnotknowitsMACaddress

B.ItisusedbythesystemthatknowsitsMACaddressbutdoesnotknowitsIPaddress

C.Itisusedbythesystemthatknowsthedestination’sIPaddressbutdoesnotknowthedestination’sMACaddress

D.Itisusedbythesystemthatknowsthedestination’sMACaddressbutdoesnotknowthedestination’sIPaddress

45)InverseAddressResolutionProtocol(InARP)isgenerallyusedby(逆向地址解析协议(InARP)通常由什么使用)？

A.Broadcastnetworks

B.Nonbroadcastnetworks

C.Bothbroadcastandnonbroadcastnetworks

46)ThePINGcommandmakesuseofwhatICMPparameter(PING命令使用了什么ICMP参数)？