LocalAreaNetwork局域网基础知识双语版.ppt

资料仅可参考，如有不妥，请联系本人改正或者删除。 * 资料仅可参考，如有不妥，请联系本人改正或者删除。 * 资料仅可参考，如有不妥，请联系本人改正或者删除。 * 资料仅可参考，如有不妥，请联系本人改正或者删除。 * 资料仅可参考，如有不妥，请联系本人改正或者删除。 * 资料仅可参考，如有不妥，请联系本人改正或者删除。 * Local Area Network What is a local area network? How does the lan works? The imporantance of lan. 制作 第二组成员员 1.What is a local area network? 局域网（Local Area Network，LAN）是指在某一区域内由多台计算机互联成的计算机组。一般是方圆几千米以内。局域网可以实现文件管理、应用软件共享、打印机共享、工作组内的日程安排、电子邮件和传真通信服务等功能。局域网是封闭型的，可以由办公室内的两台计算机组成，也可以由一个公司内的上千台计算机组成。 Lan is made up of computer groups which are connected to each other ,generally,within several kilometers.Lan can carry out files management,internet applications ,printer sharing, scheduling program.email,fax, communication service. It can be made up of two pc,and also can be made up of thousands. What is a local area network? 局域网在现在十分重要，学校，政府机构，公司都有局域网的影子，使用局域网有很多好处，所以使用的比较多。它的优势有很多。这个要和广域网相比较才能得出。 Lan technology is quite important now .The school ,govement organization,inc,almost all begain to apply pared with WAN,it has lots advantages. WAN(广域网) 广域网使用的范围比较大，但是它的缺点就是用户众多，速度慢，网路经常拥堵，而且建设成本高。每个用户只有一个IP地，每个ip地址都收费的，主要是采用有线的传输形式，成本高。 The ranage of WAN used is large,at the same time,the disadvantage is slow rate,crowed routes,the cost of construction is high.Besides,every user can only own a IP,and the ip is charged.the transmission form is lineate,which means high cost. How does the LAN works? How does the LAN works? How does the LAN works? 服务器和工作站 (serverworkstation) 根据计算机在网络中担负的任务,计算机可分为服务器和工作站两类. 服务器能为网络中的其他计算机和网络用户提供服务. 工作站是网络用户实际操作的计算机. 计算机外设 主要是指一些共享设备. According to the tasks the PC take on in the internet,computers are put into server and workstation. Servers can provide service for other pcs and internet users . Workstation is the computer which operated by the user,they are mainly some sharing devices. How does the LAN works? 1 网卡(network card) 是计算机与网络传输介质的物理接口. 2 传输介质(transmission medium) 是局域网数据传输的物理通路. 有线传输介质:双绞线?(?twisted-pair?) 、同轴电缆(??coaxial line)、光纤(fibre-optical)等。 无线传输介质：无线电(r