深圳大學(xué)期末考試數(shù)據(jù)通信與計(jì)算機(jī)網(wǎng)

精選優(yōu)質(zhì)文檔-----傾情為你奉上精選優(yōu)質(zhì)文檔-----傾情為你奉上專(zhuān)心---專(zhuān)注---專(zhuān)業(yè)專(zhuān)心---專(zhuān)注---專(zhuān)業(yè)精選優(yōu)質(zhì)文檔-----傾情為你奉上專(zhuān)心---專(zhuān)注---專(zhuān)業(yè)ShenzhenUniversityfinalexamdatacommunicationandcomputernetworksAmultiple-choice(Paper1minute,20points)

1.

Thefrequencyandnetworkfailurerecoverytimeisameasureofnetwork_____.

a.Performance

b.Security

c.Reliability

d.feasibility

2.

Disconnectallcableswillinterrupttransmission_____topology.

b.Star

c.Bus

d.ring

3.

Whenthepacketistransmittedfromthelowerlevel,theheadis_______.

a.

Removed

b.

Addto

c.

Rearrange

d.

Modify

4.

Thesecondlayerislocatedbetweenthephysicallayerand_____layers.

a.Network

b.Datalink

c.Transmission

d.Noneoftheabove

5.

_____Multiplexingtechniquesfortransmissionofdigitalsignals.

a.FDM

b.TDM

c.WDM

d.Noneoftheabove

6.

TSI,adeliveryorderfromthe_____slotvaluestoredintheRAMofthecontrol.

a.crossbarswitches

b.Transceiver

c.Thecontrolunit

ersection

7.

______Schoolinspectionmethodusinganti-codealgorithms.

a.

Simpleparitycheck

b.

Checksum

c.

CRC

d.

Popovicheventwoschoolinspection

8.

Forstopping,etc.ARQconcerned,tosenddatapacketsn,need_____confirmation.

a.

n-1

b.

n

c.

n+1

d.

2n

9.

Whendataistransmittedinthesameframeandconfirmation,called_______.

a.

Backpack

b.

Incidentally

c.

Incidentallypack

d.

Goodidea

10.

In_____,thesitedoesnotdetectthemedia.

a.

ALOHA

b.

CSMA/CD

c.

CSMA/CA

d.

TokenPassing

11.

________UsedinwirelessLAN.

a.

CSMA

b.

CSMA/CD

c.

CSMA/CD

d.

TokenPassing

12.

_____SourceaddressisnotEthernet.

a.3A-7B-6C-DE-10-00

b.EE-AA-C1-23-45-32

c.46-14-32-25-FE-F4

d.3B-21-32-DC-34-56

13.

TraditionalEthernetisdividedintofourcollisiondomainsa40site,whichmeansthatatanyonetimeupto_____competitionsitesaccessiblemedium.

a.160

b.40

c.10

d.1

14.

Redundantbridgesystemmayexist______probleminthesystem.

a.

Filtration

b.

Cycle

c.

SpanningTree

d.

Alloftheaboveitems

Fifteen.

_____CanuseintermsofsitesgroupedVLAN.

a.

MACaddress

b.

IPaddresses

c.

Theportnumber

d.Alloftheaboveitems

16.

WhoseIPaddressis4,andsubnetmask,theaddressisthesubnet

_______.a.4

b.4

c.

d.

17.

TypeTheIPaddressbelongsis_______.

a.

AClass

b.

ClassB

c.

ClassC

d.

ClassD

18.

IPheadersizeis_____long.

a.20byte

b.60byte

c.20~60bytes

d.accordingtoMTUmaybe

19.

_______

Itisaninternalroutingprotocol.

a.

RIP

b.

OSPF

c.

BGP

d.

(A)and(b)

20.

Indistancevectorrouting,arouterwillbe_____messagesent.

a.

Atregularintervals

b.Onlywhenitistimetochangethetable

c.

Onlywhenweareaddinganewhost

d.

Onlywhenaddinganewnetwork

Third,short-answerandCalculation(

MeiXiaoti20points,atotalof60points)

1.Withregardtothehierarchicalmodelandthenetworkphysicallayer,trytoanswerthefollowingquestions:

1)datacommunicationsystemhasseveralcomponentswhich?

(5points)

2)PleasedescribethehierarchicalstructureoftheInternet5-layermodelandabriefdescriptionofthefunctionofeachlayer.(5points)

3)20digitalsourcetoachievesynchronousTDMmultiplexing,rateeachsourceis100kbps,every

Outputslotcarriestwofromeachofthedigitalsignalsource,butneedtoaddaframeforsynchronization,testanswer

Thefollowingissues:

a.

Lengthinbitsoftheoutputframeisthenumber?

b.

Outputframerate?

c.

Outputframedurationlong?

d.

Theoutputdatarateisthenumber?

e.

Systemefficiencyisthenumber?

(5points)

4)Whatarethetwoswitchesinthecircuit-switchedtouse?(2points)

5)Inathree-tiercrossbarswitch,determinethenumberofintersectionn,aknowninput/outputlinenumberis20,thenumberoffirstandthirdstagesoftheswitchto4,thenumberofthesecondstageoftheswitchis2.(3points)

2.Withregardtothedatalinklayer,ask:

1)Thesystemreceivesthefollowingblock,assumedtwo-dimensionalparity,mayIaskwhatpositioniserroneousbits?

(4points)

2)trytotellIEEE

FourtraditionalEthernet802.3physicallayerimplementation.(4points)

3)IntheCSMA/CDprotocol,asitewhenaccessingthemedia?Ifthemediaisbusy,howshouldwedo?

Sitehowtodeterminethesuccessorfailureofthetransmission?Ifaconflictexists,thesitewillbehandled?(7points)

4)thefollowingdatabitstuffing:

(5points)

3.Withregardtothenetworklayer,trytoanswerthefollowingquestions:

1)liststhenameofthenetworklayertestfivekindsofagreements.(5points)

2)trytotellthestartingareaclassificationaddressingclassificationandavarietyofaddressIPad