大三上计网计算机网络tcpip.pptx

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Internetstructure:networkofnetworksTier-1ISPTier1ISPTier-1ISPNAPTier-2ISPTier-2ISPTier-2ISPTier-2ISPTier-2ISPlocalISPlocalISPlocalISPlocalISPlocalISPTier3ISPlocalISPlocalISPlocalISPExtractedfromslidesofComputerNetworkingcourseofProf.J.Kurose

TCP/IPProtocolSuite–LayeringphysicaldevicedriverandhardwarenetworktransportsessionpresentationapplicationOSImodel1234567datalinkInternetprotocolsuiteIPv4,IPv6TCPUDPapplicationSocketsXTIuserprocesskernelcommunicationsdetailsapplicationdetailsFigure1.14LayersinOSImodelandInternetprotocolsuiteExtractedfromUnixNetworkProgramming,Vol.1,3rd.Ed.,W.Stevens,

TCP/IPProtocolSuite-LayeringlinknetworkapplicationARPRARPHardwareInterfaceICMPIGMPIPmediatransportTCPUDPUserprocessUserprocessUserprocessUserprocessFigure1.4VariousprotocolsatthedifferentlayersintheTCP/IPprotocolsuiteICMP:InternetControlMessageProtocolIGMP:InternetGroupManagementProtocolIP:InternetProtocolARP:AddressResolutionProtocolRARP:ReverseAddressResolutionProtocolTCP:TransmissionControlProtocolUDP:UserDatagramProtocol

Figure2.1IEEE802.2/802.3encapsulation(RFC1042)andEthernetencapsulation(RFC894)6destinationaddr.6sourceaddr.2lengthDSAPAA1SSAPAA1cntl1orgcode003type2data38-1492CRC4type08002IPdatagram38-1492type08062ARPrequest/reply28PAD10type80352RARPrequest/reply28PAD106destinationaddr.6sourceaddr.2typedata46-1500CRC4type08002IPdatagram46-1500type08062ARPrequest/reply28PAD18type80352RARPrequest/reply28PAD1846-1500IEEE802.2/802.3encapsulation(RFC1042):Ethernetencapsulation(RFC894):802.3MAC802.2LLC802.2SNAP

ARPCachemaintainstherecentmappingsfromInternetaddressestohardwareaddressesThenormalexpirationtimeofanentryinthecacheis20minutesfromthetimetheentrywascreatedresolverFTP(1)hostnameIPaddr.TCPIPARPEthernetdriverEthernetdriverEthernetdriverARPARPIPTCP(2)establishconnectionwithIPaddress(3)sendIPdatagramtoIPaddress(4)(5)

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