Computer Networks Problem Solutions (4th Ed 2.pdf

Computer Networks Problem Solutions (4th Ed 2.pdf

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1、COMPUTERNETWORKSFOURTHEDITIONPROBLEMSOLUTIONSANDREWS.TANENBAUMVrijeUniversiteitAmsterdam,TheNetherlandsPRENTICEHALLPTRUPPERSADDLERIVER,NJ07458©2003PearsonEducation,Inc.PublishingasPrenticeHallPTRUpperSaddleRiver,NewJersey07458Allrightsreserved.Nopartofthisbookmay

2、bereproduced,inanyformorbyanymeans,withoutpermissioninwritingfromthepublisher.PrintedintheUnitedStatesofAmerica10987654321ISBN0-13-046002-8PearsonEducationLTD.PearsonEducationAustraliaPTY,LimitedPearsonEducationSingapore,Pte.Ltd.PearsonEducationNorthAsiaLtd.Pears

3、onEducationCanada,Ltd.PearsonEducacióndeMexico,S.A.deC.V.PearsonEducation—JapanPearsonEducationMalaysia,Pte.Ltd.PROBLEMSOLUTIONS1SOLUTIONSTOCHAPTER1PROBLEMS1.Thedogcancarry21gigabytes,or168gigabits.Aspeedof18km/hourequals0.005km/sec.Thetimetotraveldistancexkmisx/

4、0.005=200xsec,yieldingadatarateof168/200xGbpsor840/xMbps.Forx<5.6km,thedoghasahigherratethanthecommunicationline.2.TheLANmodelcanbegrownincrementally.IftheLANisjustalongcable.itcannotbebroughtdownbyasinglefailure(iftheserversarereplicated)Itisprobablycheaper.Itpr

5、ovidesmorecomputingpowerandbetterinteractiveinterfaces.3.Atranscontinentalfiberlinkmighthavemanygigabits/secofbandwidth,butthelatencywillalsobehighduetothespeedoflightpropagationoverthousandsofkilometers.Incontrast,a56-kbpsmodemcallingacomputerinthesamebuildinghas

6、lowbandwidthandlowlatency.4.Auniformdeliverytimeisneededforvoice,sotheamountofjitterinthenet-workisimportant.Thiscouldbeexpressedasthestandarddeviationofthedeliverytime.Havingshortdelaybutlargevariabilityisactuallyworsethanasomewhatlongerdelayandlowvariability.5.

7、No.Thespeedofpropagationis200,000km/secor200meters/µsec.In10µsecthesignaltravels2km.Thus,eachswitchaddstheequivalentof2kmofextracable.Iftheclientandserverareseparatedby5000km,traversingeven50switchesaddsonly100kmtothetotalpath,whichisonly2%.Thus,switchingdelayisn

8、otamajorfactorunderthesecircumstances.6.Therequesthastogoupanddown,andtheresponsehastogoupanddown.Thetotalpathlengthtraversedisthus160,000km.Thespeedoflightina

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