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COMPUTERNETWORKSTEACHER:HUANintroductionChapterOne第一章1Usesofcomputernetworks2Networkhardware3Networksoftware4Referencemodels1UsesofcomputernetworksChaptertwo第二章1Usesofcomputernetworks2Networkhardware3Networksoftware4Referencemodels2.1Networkhardware-transmissiontechnology2.2Networkhardware-scale2.2.1Networkhardware-scalePANPersonalAreaNetworks2.2.2Networkhardware-scalelANLocalAreaNetworks2.2.3Networkhardware-scalemANMetropolitanAreaNetworks2.2.4Networkhardware-scalewANWideAreaNetworksChapterthree第三章1Usesofcomputernetworks2Networkhardware3Networksoftware4Referencemodels3Networksoftware3.1Networksoftware-layerlayerToreducetheirdesigncomplexity,mostnetworksareorganizedasastackoflayersorlevels,eachonebuiltupontheonebelowit.Thepurposeofeachlayeristooffercertainservicestothehigherlayerswhileshieldingthoselayersfromthedetailsofhowtheofferedservicesareactuallyimplemented.3.2Networksoftware-protocolprotocolAprotocolisanagreementbetweenthecommunicatingpartiesonhowcommunicationistoproceed.

Asananalogy,whenawomanisintroducedtoaman,shemaychoosetostickoutherhand.He,inturn,maydecidetoeithershakeitorkissit,depending,forexample,onwhethersheisanAmericanlawyeratabusinessmeetingoraEuropeanprincessataformalball.Violatingtheprotocolwillmakecommunicationmoredifficult,ifnotcompletelyimpossible.3.3Networksoftware-interfaceinterface

Interfaceisaconnectionpointwhichexchangeofinformation

betweentheadjacentlayers.

Theinterfacedefineswhichprimitiveoperationsandservicesthelowerlayermakesavailabletotheupperone.3.4Networksoftware-serviceserviceAserviceisasetofoperationsthatalayerprovidestothelayeraboveit.Aservicerelatestoaninterfacebetweentwolayers,withthelowerlayerbeingtheserviceproviderandtheupperlayerbeingtheserviceuser.Layerscanoffertwodifferenttypesofservicetothelayersabovethem:connection-orientedandconnectionless.

3Networksoftware3.4Networksoftware-networkarchitecturenetworkarchitectureAsetoflayersandprotocolsiscalledanetworkarchitecture.DutchChapterfour第四章1Usesofcomputernetworks2Networkhardware3Networksoftware4Referencemodels4Referencemodels4.1Referencemodels-OSI4.1Referencemodels-OSI4.2Referencemodels-TCP/IP4.3Referencemodels-Us

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