《计算机网络与因特网》douglarsecorner著第六版英文答案Word文件下载.doc
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《计算机网络与因特网》douglarsecorner著第六版英文答案Word文件下载.doc
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Answer:
TheTCP/IPconsistsof5layers.Thelayersandtheirshortexplanationisasfollows:
• Layer1:
Physical:
ProtocolsinthePhysicallayerspecifydetailsabouttheunderlyingtransmissionmediumandtheassociatedhardware.
• Layer2:
NetworkInterfaceProtocolsintheNetworkInterfacelayerspecifydetailsaboutcommunicationbetweenhigherlayersofprotocolsandtheunderlyingnetwork.
• Layer3:
Internet:
ProtocolsintheInternetlayerformthefundamentalbasisforthe
Internet.Layer3protocolsspecifycommunicationbetweentwocomputersacrosstheInternet
•Layer4:
Transport:
ProtocolsintheTransportlayerprovideforcommunicationfromanapplicationprogramononecomputertoanapplicationprogramonanother.
• Layer5:
Application:
ProtocolsinthetoplayeroftheTCP/IPstackspecifyhowa
pairoapplicationsinteractwhentheycommunicate.
1.4Whatisaprotocolsuite,andwhatistheadvantageofasuite?
protocolsaredesignedincomplete,cooperativesetscalledsuitesorfamilies,insteadofcreatingeachprotocolinisolation.Eachprotocolinasuitehandlesoneaspectofcommunication;
together,theprotocolsinasuitecoverallaspectsofcommunication.Theentiresuiteisdesignedtoallowtheprotocolstoworktogetherefficiently.
1.5DescribetheTCP/IPlayeringmodel,andexplainhowitwasderived.
1.6ProvidereasonsforInternetgrowthinrecentyears.
1.7Whatisinteroperability,andwhyisitespeciallyimportantintheInternet?
1.8Accordingtothetext,isitpossibletodevelopInternetapplicationswithoutunderstandingthearchitectureoftheInternetandthetechnologies?
Supportyouranswer.
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Yes,possibletowritecodethatcommunicatesoveranetwork,withoutunderstandingthehardwareandsoftwaretechnologiesthatareusedtotransferdatafromoneapplicationtoanother.However,knowledgeoftheunderlyingnetworksystemallowsaprogrammertowritebettercode.
1.9Towhataspectsofnetworkingdoesdatacommunicationsrefer?
Datacommunicationsreferstothestudyoflow-levelmechanismsandtechnologiesusedtosendinformationacrossaphysicalcommunicationmedium,suchasawire,radiowave,orlightbeam.
1.10Whatisacommunicationprotocol?
Conceptually,whattwoaspectsofcommunicationdoesaprotocolspecify?
Acommunicationprotocolrefertoaspecificationfornetworkcommunication.Majoraspectsofaprotocolaresyntax(format)andsemantics(meaning)oftheprotocol.
1.11Listmajorstandardizationorganizationsthatcreatestandardsfordatacommunicationsandcomputernetworking.
Variousnationalandinternationalorganizationsareinvolvedinstandardizationofcommunicationsandnetworkingservices.Tolistfew:
• InternationalOrganizationforStandardization(ISO)
• InternationalTelecommunicationsUnion,TelecommunicationStandardization
Sector(ITU-T)
• InstituteofElectricalandElectronicsEngineers(IEEE)
• InternetEngineeringTaskForce(IETF)
1.12GiveabriefexplainofthelayersintheISOOpenSystemInterconnectionmodel.
ISOOSImodelconsistsof7layers,namely:
• Layer7:
Application
• Layer6:
Presentation
Session
• Layer4:
Transport
Network
DataLink
Physical
Readerisexpectedtofindoutshortexplanationofeachlayer.
1.13Whatispacket-switching,andwhyispacketswitchingrelevanttotheInternet?
Packetswitchingdividesdataintosmallblocks,calledpackets,andincludesanidentificationoftheintendedrecipientineachpacket.Packetswitchingchangednetworkinginafundamentalway,andprovidedthebasisforthemodernInternet.Packetswitchingallowsmultiplesenderstotransmitdataoverasharednetwork.
1.14Explainhowheadersareaddedandremovedasdatapassesthroughalayeredmodel.
eachlayeronthesendingcomputerprependsextrainformationontothepacket;
thecorrespondingprotocollayeronthereceivingcomputerremovesandusestheextrainfor
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