高级网络技术-Upper_Layers(思科教材).ppt

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 RolesoftheTransportLayer TwoDifferentTransportServices TCPandUDP TCPConnection oriented 面向连接 Reliabledelivery 可靠传输 Flowcontrol 流控 ApplicationsthatuseTCP WebBrowsers E mailFileTransfersUDPSimpleConnectionless 无连接 Lowoverhead 低开销 Besteffort 尽力而为 ApplicationsthatuseUDP DomainNameSystem DNS VideoStreaming VoiceoverIP VoIP PortAddressing UsedforIdentifyingtheConversations PortAddressing Typesofportnumbers PortAddressing netstatCommand TheTCPProtocol CommunicatingwithReliability TCP MakingConversationsReliable TCPsegment 分割 TCPServerProcess TCPConnectionEstablishment 确定 andTermination 终止 EstablishmentofTCPsessions TCPConnectionEstablishmentandTermination TerminationofTCPsessions ApplicationLayerProtocolsandServices TCP IPapplicationlayerprotocolsfitroughlyintotheframeworkofthetopthreelayersoftheOSImodel Application PresentationandSessionlayers OSIandTCP IPModelComparison MostWidely knownTCP IPApplicationLayerProtocols TheClient SeverModel Intheclient servermodel thedevicerequestingtheinformationiscalledaclientandthedevicerespondingtotherequestiscalledaserver Domainnameswerecreatedtoconvert 转换 thenumeric 数字的 addressintoasimple recognizablename DNSServicesandProtocol DNSServicesandProtocol nslookupcommand DNSServicesandProtocol TheDNSserverstoresdifferenttypesofresourcerecordsusedtoresolvenames Theserecordscontainthename address andtypeofrecord DNSServicesandProtocol AhierarchyofDNSserverscontainstheresourcerecordsthatmatchnameswithaddresses WWWServiceandHTTP Entering intheaddressbarofawebbrowsergeneratestheHTTP GET Message WWWServiceandHTTP Inresponsetotherequest theHTTPserverreturnscodeforawebpage WWWServiceandHTTP ThebrowserinterpretstheHTMLcodeanddisplaysawebpage E mailServicesandSMTP POPProtocols Clientssende mailstoaserverusingSMTPandreceivee mailsusingPOP3 E mailServicesandSMTP POPProtocols E mailServer MTA MailTransferAgent TheMTAprocessgovernse mailhandlingbetweenserversandservers E mailServicesandSMTP POPProtocols E mailServer MDA MailDeliveryAgent TheMDAprocessgovernsdeliveryofe mailbetweenserversandclients E mailServicesandSMTP POPProtocols SMTPisusedtoforwarde mail POPisusedtodelivere mail FTP FTPwasdevelopedtoallowforfiletransfersbetweenaclientandaserver DHCP TheDynamicHostConfigrationProtocol DHCP动态主机配置协议 serviceenablesdevicesonanetworktoobtainIPaddressesandotherinformationfromaDHCPserver DHCP TheDHCPservermaintainsapoolofIPaddressesandleasesanaddresstoanyDHCP enabledclientwhentheclientispoweredon FileSharingServicesandSMBProtocol SMBisaclient server request responseprotocol Serverscanmaketheirresourcesavailabletoclientsonthenetwork FileSharingServicesandSMBProtocol AfilemaybecopiedfromPCtoPCwithWindowsExplorerusingtheSMBprotocol TelnetServicesandProtocol Telnetprovidesawaytouseacomputer connectedviathenetwork toaccessanetworkdeviceasifthekeyboardandmonitorweredirectlyconnectedtothedevice PuttingitAllTogether FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanInternetwork Asimpledatatransferbetweentwohostsacrossaninternetwork FollowDataThroughanI