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ID:19534951
大小:4.11 MB
页数:58页
时间:2018-10-03
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1、UpperLayers(上层)Objectives(目标)RolesoftheTransportLayer(传输层的角色)TheTCPProtocol–CommunicatingwithReliability(TCP协议-可靠传输)MostusedApplicationLayerProtocols(常用应用层协议)ARealCase(实例)RolesoftheTransportLayerTwoDifferentTransportServicesTCPandUDPTCPConnection-oriented(面向连接)Reliabledelivery(可靠传输)Flow
2、control(流控)ApplicationsthatuseTCP:WebBrowsers;E-mailFileTransfersUDPSimpleConnectionless(无连接)Lowoverhead(低开销)Besteffort(尽力而为)ApplicationsthatuseUDP:DomainNameSystem(DNS);VideoStreaming;VoiceoverIP(VoIP)PortAddressingUsedforIdentifyingtheConversationsPortAddressingTypesofportnumbersPortA
3、ddressingnetstatCommandTheTCPProtocol–CommunicatingwithReliabilityTCP–MakingConversationsReliableTCPsegment(分割)TCPServerProcessTCPConnectionEstablishment(确定)andTermination(终止)EstablishmentofTCPsessionsTCPConnectionEstablishmentandTerminationTerminationofTCPsessionsApplicationLayerProtoc
4、olsandServicesTCP/IPapplicationlayerprotocolsfitroughlyintotheframeworkofthetopthreelayersoftheOSImodel:Application,PresentationandSessionlayers.OSIandTCP/IPModelComparisonMostWidely-knownTCP/IPApplicationLayerProtocolsTheClient-SeverModelIntheclient/servermodel,thedevicerequestingthein
5、formationiscalledaclientandthedevicerespondingtotherequestiscalledaserver.Domainnameswerecreatedtoconvert(转换)thenumeric(数字的)addressintoasimple,recognizablename.DNSServicesandProtocolDNSServicesandProtocolnslookupcommandDNSServicesandProtocolTheDNSserverstoresdifferenttypesofresourcereco
6、rdsusedtoresolvenames.Theserecordscontainthename,address,andtypeofrecord.DNSServicesandProtocolAhierarchyofDNSserverscontainstheresourcerecordsthatmatchnameswithaddresses.WWWServiceandHTTPEntering‘http://www.cisco.com’intheaddressbarofawebbrowsergeneratestheHTTP‘GET’Message.WWWServicean
7、dHTTPInresponsetotherequest,theHTTPserverreturnscodeforawebpage.WWWServiceandHTTPThebrowserinterpretstheHTMLcodeanddisplaysawebpage.E-mailServicesandSMTP/POPProtocolsClientssende-mailstoaserverusingSMTPandreceivee-mailsusingPOP3.E-mailServicesandSMTP/POPProtocolsE-mailServer–MT
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