资料计算机网络题库大连交通大学chapter4.docx

资料计算机网络题库大连交通大学chapter4.docx

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资料计算机网络题库大连交通大学chapter4

Chapter4TheNetworkLayer

1．Whatisthenameofanetwork-layerpacket?

（）

A.message

B.segment

C.datagram

D.frame

2．Whatarethetwomostimportantnetwork-layerfunctionsinadatagramnetwork?

（）

A.forwarding&routing

B.forwarding&filtering

C.routing&detecting

D.routing&checking

3．Whenapacketarrivesatarouter’sinputlink,theroutermustmovethepackettotheappropriateoutputlink,thisactioniscalled____?

（）

A.Forwarding

B.routing

C.cutthrough

D.filtering

4．Thenetworklayermustdeterminethepathtakenbypacketsastheyflowfromasendertoareceiver.Thisactioniscalled____?

（）

A.Forwarding

B.routing

C.cutthrough

D.examine

5．Arouterforwardsapacketbyexaminingthevalueofafieldinthearrivingpacket’sheader,andthenusingthisvaluetoindexintotherouter’sforwardingtable,thisvalueis?

（）

A.destinationIPaddress

B.sourceIPaddress

C.destinationMACaddress

D.sourceMACaddress

6．IPbelongsto____layer?

（）

A.transport

B.network

C.datalink

D.physical

7．Whichlayerprovideshost-to-hostservices?

（）

A.transport

B.network

C.datalink

D.physical

8．Whichlayerprovidesaconnectionservicecalledvirtual-circuitnetworksandaconnectionlessservicecalleddatagramnetworks?

（）

A.transport

B.network

C.datalink

D.physical

9．IPV4hasa___bitaddress?

（）

A.48

B.16

C.32

D.64

10．MACaddressis____bits?

（）

A.48

B.16

C.32

D.64

11．TheInternet’snetworklayerhasthreemajorcomponents,thefirstcomponentistheIPprotocol,thesecondcomponentistheroutingprotocol,thefinalcomponentis____?

（）

A.forwarding

B.addresstranslation

C.check

D.ICMP

12．HowmanybitsspecifytheIPprotocolversioninadatagram?

（）

A.1bit

B.2bits

C.4bits

D.8bits

13．MostIPV4datagramdonotcontainoptionfield,howmanybytesaheaderhasinatypicalIPdatagram?

（）

A.4bytes

B.8bytes

C.16bytes

D.20bytes

14．HowmanybitsusedinIPdatagramexpresstotallengthoftheIPdatagram?

（）

A.4bits

B.8bits

C.16bits

D.20bits

15．Data-gramsarerarelylargerthan____?

（）

A.1500bytes

B.65535bytes

C.500bytes

D.1024bytes

16．NewversionofIP----IPV6doesnotallowfragmentin____?

（）

A.Router

B.Host

C.Bothofabove

D.Noneofabove

17．HowdoestheTTLchangedbyoneeachtimethedatagramisprocessedbyarouter?

（）

A.decrease

B.increase

C.nochange

D.always0

18．WhichlayerprotocolisindicatedbythevalueofprotocolfieldinIPdatagram?

（）

A.application

B.transport

C.network

D.datalink

19．IPoptionisdroppedinthe____header.（）

A.IPv6

B.IPv4

C.TCP

D.UDP

20．ThedatafieldinIPdatagramcancarrymanytypesofdataexcept____.（）

A.TCP

B.UDP

C.ICMP

D.MAC

21．ICMPisusedfor____?

（）

A.Reliabledatatransfer

B.Errorreporting

C.Flowcontrol

D.Congestioncontrol

22．SupposeyoureceiveanIPdatagramfromonelinkandcheckyourforwardingtabletodeterminetheoutgoinglink,butthisoutgoinglinkhasanMTUthatissmallerthanthelengthofIPdatagram.Whichtechnologywillbeused?

（）

A.resend

B.discard

C.fragment

D.none

23．ThedesignerofIPv4decidedtoputthejobofdatagramreassemblyin____.（）

A.router

B.switch

C.hub

D.endsystem

24．IPaddressingassignsanaddressto223.10.198.250/29,thenetworkaddressforthisnetworkis____.（）

A.223.10.198.248

B.223.10.198.250

C.223.10.198.0

D.223.10.0.0

25．Ifalldata-gramsarrivingattherouterfromWANhavethesamedestinationIPaddress,thenhowdoestherouterknowtheinternalhosttowhichitshouldforwardagivendatagram?

Thetrickistouse____tableatrouter,andincludeportnumbersaswellasIPaddressinthetableentries.（）

A.routing

B.forwarding

C.ARP

D.NATtranslation

26．WhenrunningaTelnet,FTP,orHTTPsession,youmayhaveencounteredanerrormessagesuchas“Destinationnetworkun-reachable”,Thismessagehaditsoriginin____.（）

A.IGMP

B.EGP

C.ICMP

D.BGP

27．Thewell-knownpingprogramsendsan（a）____type8code0messagetothespecifiedhost.Thedestinationhostsseeingtheechorequest,sendbackatype0code0ICMPechoreply.（）

A.ICMP

B.IGMP

C.TCP

D.UDP

28．Tracer-outisimplementedwith____messages.（）

A.IGMP

B.TCP

C.UDP

D.ICMP

29．ThestandardTracer-outprogramactuallysendssetsof____packetswiththesameTTL.（）

A.one

B.two

C.three

D.four

30．IPv6increasesthesizeoftheIPaddressfrom32bitto____bit.（）

A.64

B.128

C.256

D.512

31．HowmanybytesarethereinheaderofIPv6?

（）

A.8

B.20

C.40

D.32

32．IPv6doesnotallowforfragmentationandreassemblyatinter-media____.（）

A.routers

B.switches

C.endsystem

D.hubs

33．Fromsendertoreceivers,allpacketswilltakethesamepath,thisisweusea____service.（）

A.datagram

B.VC

C.circuit

D.Ethernet

34．____meansmovingpacketsfromrouter’sinputporttoappropriaterouteroutputport?

（）

A.forwarding

B.filtering

C.routing

D.switching

35．____meansdeterminingroutetakenbypacketsfromsourcetodestination?

（）

A.forwarding

B.filtering

C.routing

D.switching

36．Arouterworksin____layer?

（）

A.Networking

B.Datalink

C.Application

D.Physical

37．Aswitchworksin____layer?

（）

A.Networking

B.Datalink

C.Application

D.Physical

38．Networkinglayerprovidesservicesbetweentwo____.（）

A.Hosts

B.Processes

C.Applications

D.Machines

39．Linklayerprovidesservicesbetweentwo____.（）

A.Hosts

B.Processes

C.Applications

D.Machines

40．Theinternet’snetworklayerprovidesasingleservice----thatis____.（）

A.Reliabledatatransfer

B.Flowcontrol

C.Congestioncontrol

D.Best-effort-service

41．Datagramnetworkprovidesnetwork-layer____.（）

A.connectionlessservice

B.connectionservice

C.bothofabove

D.neitherofAandB

42．VCnetworkprovidesnetwork-layer____.（）

A.connectionlessservice

B.connectionservice

C.bothofabove

D.neitherofAandB

43．InVCnetwork,eachpacketcarries____.（）

A.VCidentifier

B.destinationhostaddress

C.IPaddress

D.Macaddress

44．AVCconsistsofthreepart,thisthreepartsdonotinclude____.（）

A.Pathfromsourcetodestination

B.VCnumbers,onenumberforeachlinkalongpath

C.Entriesinforwardingtablesinroutersalongpath

D.Destinationaddress

45.In____networking,aseriesofpacketmayfollowdifferentpathsandmayarriveoutoforder?

（）

A.Datagram

B.VC

C.TCP

D.Noneofabove

46．Theinternetisa（an）____network?

（）

A.Datagram

B.VC

C.Bothofabove

D.Noneofabove

47．Thefourcomponentsofarouterdonotinclude____?

（）

A.Inputandoutputports

B.Switchfabric

C.Routingprocessor

D.Switchingprocessor

48．Therearethreekindsofswitchfabricforarouternormally,thosethreeswitchfabricdonotincludes____?

（）

A.Switchingviamemory

B.Switchingviaabus

C.SwitchingviaanInterconnection-Network

D.Packetswitching

49．Whichofthefollowingprotocolisusedforerrorreporting?

（）

A.ICMP

B.TCP

C.IP

D.UDP

50．Whichofthefollowingisnotaroutingprotocol?

（）

A.TCP

B.RIP

C.OSPF

D.BGP

51．IPV4hasa___bitsaddress?

（）

A.32

B.64

C.16

D.128

52．IPaddressisidentifierfor____.（）

A.Host

B.Routerinterface

C.Bothofabove

D.Noneofabove

53．“233.1.1.0/24”,wherethe/24notation,sometimesknownasa____.（）

A.Subnetmask

B.Networkingaddress

C.Hostaddress

D.Noneofabove

54．Subnetswithan8-,____-,and24-bitsubnetaddresseswereknowasclassA,B,andCnetworksrespectively.（）

A.9

B.10

C.12

D.16

55．IPV6hasa___bitsaddress?

（）

A.32

B.64

C.16

D.128

56．____meansthatIPv6nodesalsohaveacompleteIPv4implementationaswell?

（）

A.Dualstack

B.Tunneling

C.Bridgeconnection

D.Forwarding

57．____meansthatIPv6carriedaspayloadinIPv4data-gramamongIPv4routers?

（）

A.Dualstack

B.Tunneling

C.Bridgeconnection

D.Forwarding

58．Typicallyahostisattacheddirectlytoonerouter,the____forthehost.（）

A.Defaultrouter

B.Sourcerouter

C.Destinationrouter

D.Corerouter

59．Thedefaultrouterofthesourcehostisknownas____.（）

A.Defaultrouter

B.Sourcerouter

C.Destinationrouter

D.Corerouter

60．Thedefaultrouterofthedestinationhostisknownas____.（）

A.Defaultrouter

B.Sourcerouter

C.Destinationrouter

D.Corerouter

61．Apathbetweenthesourceanddestinationthathasbeastcostisknownas____.（）

A.Leastcostpath

B.Shortestpath

C.Largestcostpath

D.Noneofabove

62．Thepathwiththesmallestnumberoflinksbetweenthesourceandthedestinationisknownas____.（）

A.Leastcostpath

B.Shortestpath

C.Largestcostpath

D.Noneofabove

63．WhichoffollowingaboutDVisnotcorrect?

（）

A.Iterative

B.Synchronous

C.Distributed

D.Self-terminating

64．Whichofthefollowingisnotintra-ASroutingprotocol?

（）

A.RIP

B.OSPF

C.IGRP

D.BGP

65．RIPisakindof____algorithm.（）

A.DV

B.LS

C.Bothofabove

D.NeitherofAandB

66．OSPFisakindof____algorithm.（）

A.DV

B.LS

C.Bothofabove

D.NeitherofAandB

67．Therouterinnon-backboneareasandperformonlyintra-ASroutingisknownas____.（）

A.Internalrouters

B.Areaborderrouters

C.Backbonerouters

D.Boundaryrouters

68．____“summarize”distancestonetsinownarea,advertisetootherAreaBorderrouters.（）

A.Internalrouters

B.Areaborderrouters

C.Backbonerouters

D.Boundaryrouters

69．____runsOSPFroutinglimitedtobackbone.（）

A.Internalrouters

B.Areaborderrouters

C.Backbonerouters

D.Boundaryrouters

70．____connecttootherAS’s.（）

A.Internalrouters

B.Areaborderrouters

C.Backbonerouters

D.Boundaryrouters

71．Whichofthefollowingisaninter-autonomoussystemroutingprotocol?

（）

A.RIP

B.OSPF

C.IGRP

D.BGP

72．____meanssen