计算机网络教程自顶向下方法选择题及答案chapt4networklayerquizz.docx
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计算机网络教程自顶向下方法选择题及答案chapt4networklayerquizz.docx
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计算机网络教程自顶向下方法选择题及答案chapt4networklayerquizz
Chapter4NetworkLayer
1.
Packetizingatthenetworklayerinvolves
A)Encapsulatingthepayloadatthesource
B)Addsaheaderthatcontainsthesourceanddestinationinformation
C)Decapsulatingthepayloadatthedestination
D)Allofthechoicesarecorrect
2.
Routersinthepatharenotallowedto___________________________.
A)fragmentthepackettheyreceive
B)decapsulatethepacket
C)changesourceordestinationaddress
D)Allofthechoicesarecorrect
3.
ThenetworklayerintheInternetprovides_________________.
A)comprehensiveerrorandflowcontrol.
B)limitederrorcontrol,butnoflowcontrol.
C)comprehensiveerrorcontrolbutlimitedflowcontrol.
D)Allofthechoicesarecorrect
4.
Inavirtual-circuitapproach,theforwardingdecisionisbasedonthevalueofthe_____________fieldinthepacketheader.
A)sourceaddress
B)destinationaddress
C)label
D)Noneofthechoicesarecorrect
5.
Inadatagramapproach,theforwardingdecisionisbasedonthevalueofthe_____________fieldinthepacketheader.
A)sourceaddress
B)destinationaddress
C)label
D)Noneofthechoicesarecorrect
6.
Theperformanceofanetworkcanbemeasuredintermsof________.
A)delay
B)throughput
C)packetloss
D)allofthechoicesarecorrect
7.
Transmissiondelay(time)istheratioof______________________.
A)transmissionratetopacketlength
B)transmissionratetodistance
C)packetlengthtotransmissionrate
D)processingtimetotransmissionrate
8.
Propagationdelay(time)istheratioof______________________.
A)transmissionratetopropagationspeed
B)propagationspeedtodistance
C)packetlengthtopropagationspeed
D)distancetopropagationspeed
9.
Whentheloadinthenetworkreachesthenetworkcapacity,thepacketdelay___________andthenetworkthroughputreaches______________.
A)increasessharply;itsminimum
B)increasessharply;itsmaximum
C)decreasessharply;itsminimum
D)decreasessharply;itsmaximum
10.
Inopen-loopcongestioncontrol,policiesareapplied____________________.
A)topreventcongestionbeforeithappens
B)toalleviatecongestionafterithappens
C)toeitherpreventcongestionbeforeithappensortoalleviatecongestionafterithappens
D)Noneofthechoicesarecorrect
11.
The__________________techniqueisoneoftheopen-loopcongestionpolicy
A)backpressure
B)chokepacket
C)implicitsignaling
D)Noneofthechoicesarecorrect
12.
The__________________techniqueisoneoftheclose-loopcongestionpolicy
A)acknowledgmentpolicy
B)chokepacket
C)discardingpolicy
D)Noneofthechoicesarecorrect
13.
IPisa_________protocol.
A)connection-orientedunreliable
B)connection-orientedreliable
C)connectionlessunreliable
D)connectionlessreliable
14.
AnHLENvalueofdecimal10means_______.
A)thereare10bytesofoptions
B)thereare10bytesintheheader
C)thereare40bytesofoptions
D)thereare40bytesintheheader
15.
Ifthefragmentoffsethasavalueof100,itmeansthat_______.
A)thedatagramhasnotbeenfragmented
B)thedatagramis100bytesinsize
C)thefirstbyteofthedatagramisbyte800
D)Noneofthechoicesarecorrect
16.
Whatisneededtodeterminethenumberofthelastbyteofafragment
A)offsetnumber
B)totallength
C)bothoffsetnumberandthetotallength
D)Noneofthechoicesarecorrect
17.
TheIPheadersizeis_______byteslong.
A)20to60
B)20
C)60
D)Noneofthechoicesarecorrect
18.
PacketsintheIPlayerarecalled_________.
A)segments
B)datagrams
C)frames
D)Noneofthechoicesarecorrect
19.
Thetotallengthfielddefinesthetotallengthofthedatagram_________.
A)includingtheheader
B)excludingtheheader
C)excludingtheoptionlength
D)Noneofthechoicesarecorrect
20.
Whenadatagramisencapsulatedinaframe,thetotalsizeofthedatagrammustbelessthanthe_______.
A)MUT
B)MAT
C)MTU
D)Noneofthechoicesarecorrect
21.
AnIPv4addressisnormallyrepresentedinbase____indotted-decimalnotation.
A)16
B)256
C)10
D)Noneofthechoicesarecorrect
22.
Inclassfuladdressing,theIPv4addressspaceisdividedinto_______classes.
A)3
B)4
C)5
D)Noneofthechoicesarecorrect
23.
Thenumberofaddressesassignedtoanorganizationinclasslessaddressing_______.
A)canbeanynumber
B)mustbeamultipleof256
C)mustbeapowerof2
D)Noneofthechoicesarecorrect
24.
Thefirstaddressassignedtoanorganizationinclasslessaddressing_______.
A)mustbeevenlydivisiblebythenumberofaddressesintheorganization
B)mustbedivisibleby128
C)mustbelongtooneoftheA,B,orCclasses
D)Noneofthechoicesarecorrect
25.
Insubnetting,thenumberofaddressesineachsubnetmust_______.
A)beapowerof2
B)beamultipleof128
C)bedivisibleby128
D)Noneofthechoicesarecorrect
26.
WhatisthedefaultprefixlengthforclassAinCIDRnotation
A)9
B)8
C)16
D)Noneofthechoicesarecorrect
27.
WhatisthedefaultprefixlengthforclassBinCIDRnotation
A)9
B)8
C)16
D)Noneofthechoicesarecorrect
28.
WhatisthedefaultprefixlengthforclassCinCIDRnotation
A)24
B)8
C)16
D)Noneofthechoicesarecorrect
29.
DHCPisa(an)___________layerprotocol.
A)application
B)transport
C)network
D)data-link
30.
InDHCP,theclientuses________portandtheserveruses_________port.
A)anephemeral;awell-known
B)awell-known;awell-known
C)awell-known;anephemeral
D)Noneofthechoicesarecorrect
31.
DHCPusestheservicesof_______.
A)UDP
B)TCP
C)IP
D)Noneofthechoicesarecorrect
32.
_________allowsasitetouseasetofprivateaddressesforinternalcommunicationandasetofglobalInternetaddressesforcommunicationwiththerestoftheworld.
A)DHCP
B)NAT
C)IMCP
D)Noneofthechoicesarecorrect
33.
Theideaofaddressaggregationwasdesignedtoalleviatetheincreaseinroutingtableentrieswhenusing________addressing.
A)classful
B)classless
C)classfulorclassless
D)Noneofthechoicesarecorrect
34.
Theuseofhierarchyinroutingtablescan________thesizeoftheroutingtables.
A)reduce
B)increase
C)neitherreducenorincrease
D)Noneofthechoicesarecorrect
35.
ICMPisa(an)_________layerprotocol.
A)application-layerprotocolthathelpsTCP/IPatthenetworklayer
B)transport-layerprotocolthathelpsTCP/IPatthenetworklayer
C)network-layerprotocol.
D)data-linklayerprotocolthathelpsTCP/IPatthenetworklayer
36.
WhichofthefollowingistrueaboutICMPmessages
A)AnICMPerrormessagemaybegeneratedforanICMPerrormessage.
B)AnICMPerrormessagemaybegeneratedforafragmenteddatagram.
C)AnICMPerrormessagemaybegeneratedforamulticastdatagram.
D)Noneofthechoicesarecorrect
37.
Routinginsideanautonomoussystemisreferredtoas________routing.
A)interdomain
B)intradomain
C)out-of-domain
D)Noneofthechoicesarecorrect
38.
Routingbetweenautonomoussystemsisreferredtoas______routing.
A)interdomainrouting
B)intradomainrouting
C)out-of-domain
D)Noneofthechoicesarecorrect
39.
In_______routing,theleastcostroutebetweenanytwonodesistheroutewiththeminimumdistance.
A)pathvector
B)distancevector
C)linkstate
D)Noneofthechoicesarecorrect
40.
In________,eachnodemaintainsavector(table)ofminimumdistancestoeverynode.
A)pathvector
B)distancevector
C)linkstate
D)Noneofthechoicesarecorrect
41.
Indistancevectorrouting,eachnodeperiodicallysharesitsroutingtablewith_________andwheneverthereisachange.
A)everyothernode
B)itsimmediateneighbors
C)oneneighbor
D)Noneofthechoicesarecorrect
42.
TheRoutingInformationProtocol(RIP)isanintradomainroutingbasedon_________routing.
A)distancevector
B)linkstate
C)pathvector
D)Noneofthechoicesarecorrect
43.
Themetricusedby_______isthehopcount.
A)OSPF
B)RIP
C)BGP
D)Noneofthechoicesarecorrect
44.
InRIP,the________timercontrolstheadvertisingofregularupdatemessages.
A)garbagecollection
B)expiration
C)periodic
D)Noneofthechoicesarecorrect
45.
InRIP,the________timerisusedtopurgeinvalidroutesfromthetable.
A)garbagecollection
B)expiration
C)periodic
D)Noneofthechoicesarecorrect
46.
InRIP,the________timercontrolsthevalidityoftheroute.
A)garbagecollection
B)expiration
C)periodic
D)Noneofthechoicesarecorrect
47.
RIPusestheservicesof_______.
A)TCP
B)UDP
C)IP
D)Noneofthechoicesarecorrect
48.
The_________routingusestheDijkstraalgorithmtobuildaroutingtable.
A)distancevector
B)linkstate
C)pathvector
D)Noneofthechoicesarecorrect
49.
TheOpenShortestPathFirst(OSPF)protocolisanintradomainroutingprotocolbasedon_______routing.
A)distancevector
B)linkstate
C)pathvector
D)Noneofthechoicesarecorrect
50.
The_______protocolallowstheadministratortoassignacost,calledthemetric,toeachroute.
A)OSPF
B)RIP
C)BGP
D)Noneofthechoicesarecorrect
51.
InOSPF,a________linkconnectstworouterswithoutanyotherhostorrouterinbetween.
A)point-to-point
B)transient
C)stub
D)Noneofthechoicesarecorrect
52.
InOSPF,a_______linkisanetworkwithseveralroutersattachedtoit.
A)point-to-point
B)transient
C)stub
D)Noneofthechoicesarecorrect
53.
InOSPF,a________linkisanetworkconnectedtoonlyonerouter.
A)point-to-point
B)transient
C)stub
D)Noneofthechoicesarecorrect
54.
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