计算机网络专业英语 课件 L2-4 Text 4 Metropolitan Area Network (MAN) and Wide Area Network (WAN).pptx
L2-4
Lesson2NetworkClassification
Text4MetropolitanAreaNetwork(MAN)andWideAreaNetwork(WAN)
要点KeyPoints:超过和限制最初、原来建立基础、根据分配、指定难句分析和翻译
Theincreasedcablingdistancesenabledbytheuseoffiber-opticcableinEthernet-basednetworkshasresultedinablurringofthedistinctionbetweenLANsandWANs.EthernetwasinitiallylimitedtoLANcablesystemswithinsinglebuildings,andthenextendedtobetweenbuildings.ItcannowbeappliedacrossacityinwhatisknownasaMetropolitanAreaNetwork.Initial最初的、字首的(顺序)Original原来的、首创的(起源)Theoriginalthickcoaxialand。。。Primitive原始的、最早的、初期的(顺序+起源)Primary主要的、初级的Extend向外延展Expand扩充内容Exceed超过边界
TheWideAreaNetworktechnologyisamethodofcreatinganintelligentdatasharingnetworkofcomputers,whosecomplexityandscaleissohugethatitmayextendoveracity,aregion,oracountry.Itmayevenbeaninternationalnetwork.TheInternetisthewidestWANconstructedyet.Nowadays,privateorganizationslikebigsoftwarecompanieshavetheirownWANsconstructed.Itmakestheirinternalcommunicationsimplerandmoresecure.InternetserviceprovidersprovideconnectivityandinfrastructuretoprivateLANsandintegratethemintotheInternet.WideareanetworkscanbeconstructedinavarietyofwaysdependingonwhatkindoflinkingorInternetconnectionisused.WANscouldalsobeclassifiedonthebasisofwhatkindofInternetprotocolordatasharingtechniquetheyuse.Build建立(建筑及其他)Establish建立、确立、确定Construct建造、创立Create创造、创建Form形成、够成Base及物和不及物动词Depend不及物动词。complexity复杂性connectivity连接性-ity的后缀经常表示“抽象的性质”basic形容词,名词basis名词base动词,名词基础:base较具体,basis、basic较抽象事情的根据,原理原理和要素东西的基础
Wideareanetworktechnologyhasthreemajorcomponents.ThemaincomponentisthedatalinethatconnectsthenetworktotheInternetsuperhighway.Thismayvaryinthedatatransferspeeditoffers.Thencometotherouters,thatis,theroutingmechanismandthesoftwarecomponentorprotocolmechanism.Routersar