计算机专业英语ppt

计算机专业英语Chapter6ComputerNetworksReadingChapter6WhatcanIdo?Theproblemissolved!计算机专业英语Chapter6WhatCanIDo??Background:RichardandJohnsonarecousins.Nowtheyareinthesameuniversity,bothmajorincomputerscience.Johnsonisafreshman,juniortoRichard.Oneday,RichardmeetsJohnson.Nowlet’shearwhattheyaretalkingabout.计算机专业英语Chapter6RICHARD:Hi,Johnson,howiseverythinggoing?JOHNSON:Hi,Richard,I’vejustadjustedtothecollegelife.RICHARD:Butyoulookalittleworried.What’sup?JOHNSON:Ihavesomeproblemswithmypaperthattheteacherassignedlastweek.IhavetohanditinnextFriday.There’reonlyafewdaystogobutIdon’tknowhowtostartityet.Canyoulendmeahand?RICHARD:Sure.Whatpaper?JOHNSON:ApaperabouttheinfluenceandthefunctionsoftheInternet.Youknow,inhighschool,IwasjustbusywithstudyandhavenotimetoaccesstheInternet.Ievenknownothingaboutit.RICHARD:Igotit.Takeiteasy.It’sveryeasytowritethepaper.It’sabsolutelynecessaryforyoufreshmenmajoringincomputersciencetoknowtheinfluenceandthefunctionsoftheInternet.Nowadays,manypeopletakeadvantageoftheInternettogettheinformationtheywant.Inmyopinion,Iwouldrecommendthatinthefirstplace,youlearntosurftheInternet.JOHNSON:Buthow?RICHARD:Infact,youjustkeyinawebsitecontainingasearchenginewhereyoukeyinthekeywordsrelatedtotheinformationyouwant.Then,thewebpageswillshowyoutheresultofbrowsing.JOHNSON:Itsoundssowonderful.Isee.Youaresohelpful.Thankyou!Ireallycan’twaittotry.WhatCanIDoback计算机专业英语Chapter6Contents6.4NetworkSecurity6.3Internet6.2LAN6.1IntroductiontoNetwork计算机专业英语Chapter66.1IntroductiontoNetworkTypesofnetwork1BasicHardwareComponents2BasedonscaleBasedonconnectionmethodProtocols3Basedonnetworktopology计算机专业英语Chapter6QuestionsTypesofnetworkWhatisnetwork?Pleasebrieflylistthemaintypesofnetworksbasedonthescale.WhatisInternet?123Whatisnetwork?Pleasebrieflylistthemaintypesofnetworksbasedonthescale.WhatisInternet?12计算机专业英语Chapter6Acomputernetworkconnectscomputerstogether.Throughthenetwork,userscansharehardware,software,anddata,aswellaselectronicallycommunicationwitheachother.Typesofnetwork共享，分享硬件软件数据交流，通讯并且，也，还网络计算机专业英语Chapter6Basedonthescaleorgeographicalrange,networkcanbemainlyclassifiedasthreetypes:LocalAreaNetworks(LAN),MetropolitanAreaNetworks(MAN)andWideAreaNetworks(WAN).Typesofnetwork规模，大小地域的分类局域网城域网广域网计算机专业英语Chapter6Computernetworkscanalsobeclassifiedaccordingtothehardwaretechnologythatisusedtoconnecttheindividualdevicesinthenetworksuchasopticalfiber,Ethernet,WirelessLAN,Powerlinecommunication.Typesofnetwork技术无线的以太网光纤设备单个的计算机专业英语Chapter6Computernetworkscanbeclassifiedaccordingtothenetworktopologyuponwhichthenetworkisbased,suchasBusnetwork,Starnetwork,Ringnetwork,Treenetwork.Typesofnetwork拓扑结构树型网络环型网络总线型网络星型网络计算机专业英语Chapter6Internetconsistsofaworldwideinterconnectionofgovernmental,academic,public,andprivatenetworksbasedupontheAdvancedResearchProjectsAgencyNetwork(ARPANET)developedbyDARPAoftheUSDepartmentofDefenseandreferstoasthe“Internet”withacapital“I”todistinguishitfromothertypesofinternetworks.Typesofnetwork此句看似复杂，但却是一个简单句。句子的主语是Internet，有两个并列谓语consistsof和refersto，其中consistsof的宾语是一个很长的短语，aworldwideinterconnectionofgovernmental,academic,public,andprivatenetworksbasedupontheAdvancedResearchProjectsAgencyNetwork(ARPANET)developedbyDARPAoftheUSDepartmentofDefense，该宾语含两个过去分词短语：basedupontheAdvancedResearchProjectsAgencyNetwork(ARPANET)和developedbyDARPAoftheUSDepartmentofDefense，均作定语。句子译为：互联网由全球联网的政府，学术，公共和私人网络构成，建立在美国国防部高级调查署开发的网络基础上，常用带有大写“I”的“Internet”来区别于其它种类的互联网络。计算机专业英语Chapter6QuestionHardwarecomponentsDoyouknowwhatthebasichardwarecomponentsthatinterconnectnetworknodesare?计算机专业英语Chapter6Allnetworksaremadeupofbasichardwarebuildingblockstointerconnectnetworknodes,suchasnetworkinterfacecards,bridges,hubs,switches,androuters.Hardwarecomponents互相连接节点路由器交换机集线器网络接口卡网桥由…组成计算机专业英语Chapter6Anetworkcard,alsocallednetworkadapterornetworkinterfacecard,isapieceofcomputerhardwaredesignedtoallowcomputerstocommunicateoveracomputernetwork.Hardwarecomponents网络适配器接口计算机专业英语Chapter6Arepeaterisadevicethatamplifiessignalsalonganetwork.Itcanreceiveasignalandretransmititatahigherlevel,orontotheothersideofanobstruction,sothatthesignalcancoverlongerdistanceswithoutdegradation.Hardwarecomponents放大信号重新发射阻碍，阻塞衰减，退降计算机专业英语Chapter6Ahubcontainsmultipleports.Whenapacketarrivesatoneport,itiscopiedtoalltheportsofthehubfortransmission.Hardwarecomponents多个包含端口数据包复制传输计算机专业英语Chapter6Anetworkbridgeconnectsmultiplenetworksegmentsatthedatalinklayer(layer2)oftheOSImodel.Hardwarecomponents数据链路层网段开放系统互连参考模型计算机专业英语Chapter6Aswitchisadevicethatperformsswitching.Hardwarecomponents执行交换计算机专业英语Chapter6Routersforwarddatapacketsbetweennetworks.Itcandeterminethebestpathtoforwardthepackets.Hardwarecomponents数据包转发决定路径计算机专业英语Chapter6QuestionsProtocolsWhatarethecommonInternetprotocols?21Whatisprotocol?计算机专业英语Chapter6Anetworkprotocoldefinesrulesandconventionsforcommunicationbetweennetworkdevices.Protocols惯例规则计算机专业英语Chapter6ProtocolsInternetprotocolscommonlyinclude:TransmissionControlProtocol(TCP),InternetProtocol(IP),HypertextTransferProtocol(HTTP).互联网协议超文本传送协议传输控制协议计算机专业英语C