八年级信息技术上册第一单元走进网络第1课《认识网络》课件4浙教版.ppt

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第一课 认识网络,你 知道 这是什么吗?,电网,生活中你还知道哪些 ?,网络,电网,有线电话网,人际关系网,交通网,销售网,物流网,有线电视网,看得见的网:,看不见的网:,计算机网络,计算机网络是现代通信技术与计算机技术相结合的产物,它是利用网卡、网线、交换机等网络设备,把分散的计算机连接起来,并通过网络协议,来实现计算机之间通信以及资源共享。,网络,网络是由 和 构成,示诸对象及其相互联系。,特点:纵横密布,交错不可分,?,节点,连线,计算机网络设备,网卡,交换机,路由器,网线,VS,计算机网络的分类,按覆盖范围分:局域网LAN(作用范围一般为几米到几十公里) 城域网MAN(界于WAN与LAN之间) 广域网WAN(作用范围一般为几十到几千公里),Internet,计算机教室的网络连接,电脑,交换机,已连网络的接路由器,网络连接线的制作,EIA/TIA 568B标准 1 2 3 4 5 6 7 8 白橙 橙 白绿 蓝 白蓝 绿 白棕 棕,排线顺序,剥线,排线,剪齐,按顺序插入水晶头,压线,网线测试仪,制作步骤,剥线排线剪齐压线,EIA/TIA 568B线序 1 2 3 4 5 6 7 8 白橙 橙 白绿 蓝 白蓝 绿 白棕 棕,

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