internet 安全协议

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1、InternetSecurityProtocolsInternet安全协议HTTPProtocolHttp协议HyperTextTransferProtocol超文本传输协议UsedontheInternetInternet上使用BasedonRequest-ResponseModel基于请求-响应模式StaticWebPage静态Web页面Fig6.1WebBrowserWebServerStep1:HTTPRequestStep2:HTTPResponseExampleSampleHTTPInteractionHTTP交互例子Fig6.2WebBrowserWebServe

2、rGET/files/new/image1HTTP/1.1Accept:image/gifAccept:image/jpegHTTP/1.1200OKDate:Tue,19-06-0215:58:10GMTServer:MyServerContent-length:3010…(Actualdatafortheimage)HTTPRequestHTTPResponseDynamicWebPage动态Web页ClientsendsHTTPRequest客户端发送HTTP请求Serverexecutesaprogram服务器执行程序ServersendsbackanHTTPRespo

3、nse服务器返回一个HTTP响应DynamicWebPage动态Web页Fig6.3WebBrowserWebServerStep1:HTTPRequestStep4:HTTPResponseStep2:InvokesanapplicationprograminresponsetotheHTTPrequestStep3:TheprogramexecutesandproducesHTMLoutputActiveWebPage活动Web页ClientsendsHTTPRequest客户端发送HTTP请求ServersendsbackHTMLPageandaClient-sidePr

4、ogram服务器端返回HTML页和客户端程序Examples:Applet,ActiveXControl例如：Applet,ActiveXControlActiveWebPage活动Web页Fig6.4WebBrowserWebServerStep1:HTTPRequestStep2:HTTPResponseContainsHTMLPage…..…..SmallProgram…..…..Step3:BrowserinterpretsHTMLpageandalsoexecutestheprogramTCP/IPTCP/IP协议TransmissionControlProtocol

5、/InternetProtocol传输层控制协议/Internet协议ConventionforcommunicationontheInternetInternet上通信的协定Consistsoffivelayersofsoftware包含5层软件TCP/IPLayersTCP/IP层Fig6.5LayerNumberLayerName5(Highest)Application4Transport3Internet2Datalink1(Lowest)PhysicalTCP/IPLayersFig6.6ApplicationLayerTransportLayerInternetL

6、ayerDataLinkLayerPhysicalLayerTCP/IPConceptTCP/IP概念Alllayersexceptphysicallayercommunicatewithadjacentlayersonthesamecomputer除了物理层的所有层都和同一计算机上的相邻层进行通信Physicallayeristheonlylayerwhereactualtransmissionbetweentwocomputershappens物理层是唯一在两个计算机间进行实际数据传输的层TCP/IPCommunicationTCP/IP通信Fig6.7XYIntermed

7、iatenodesApplicationTransportNetworkDataLinkPhysicalNetworkDataLinkPhysicalApplicationTransportNetworkDataLinkPhysicalCommunicationlinkNetworkDataLinkPhysicalNetworkDataLinkPhysicalDataExchangeusingTCP/IPLayers使用TCP/IP层交换数据XL5dataH40101010101000101