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第 9 章 计算机网络基础与因特网. 基本内容. 计算机网络基础. Internet 基础. 接入 Internet. IE 浏览器. 电子邮件. 9.1计算机网络基础. 计算机网络(技术)是现代计算机技术与通信技术相互渗透、密切结合而形成的一门交叉学科。 1.计算机网络的概念 计算机网络( Computer Network) 就是将地理上分散布置的具有独立功能的多台计算机(系统)或由计算机控制的外部设备,利用通信手段通过通信设备和线路连接起来,按照特定的通信协议进行信息交流,实现资源共享的系统 。. 2.计算机网络的基本特征: - PowerPoint PPT Presentation
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9
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9. 1 2 3
(1)
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3. 1969(ARPA) ARPANET 196912(ARPANet)SIGMA-7SDS904IBM360/75PDP-10Internet
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(3)90(National Information Infrastructure)NII 1991InternetCommercial Internet Exchange AssociationInternetWWWInternet1997Internet622Mbps
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(2)IPIP IP32InternetInternet202.112.105.118IP 1 Internet 2
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IPABCIPA: 27 =1281600B:214 =1638465,536C:221 =2097150C256
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9.3.4 Internet InternetInternet1USENet23
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