计算机网络教程自顶向下方法选择题 Chapt 4 Network L.docx
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计算机网络教程自顶向下方法选择题 Chapt 4 Network L.docx
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计算机网络教程自顶向下方法选择题Chapt4NetworkL
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)beapowero
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