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
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