Why study computer network appeared in the 20th century, computer, the combination of computer and communication technologies and large-scale development, there have been computer networks, there has been Internet it is the 20th century s greatest scientific and technological achievements.

计算机网络前几章讲义\CH3 数据链路层20061230.ppt
....................\计算机网络讲义-1：引言.ppt
....................\计算机网络讲义-2：传输介质.ppt
....................\计算机网络讲义-3：传输技术.ppt
....................\计算机网络讲义-4：网络体系结构.ppt
....................\计算机网络讲义-5网络拓结构.ppt
....................\计算机网络讲义-6局域网技术.ppt
....................\计算机网络讲义-7广域网技术.ppt
....................\计算机网络讲义第九章：TCPIP.ppt
....................\计算机讲义第十章：网络互连.ppt
计算机网络前几章讲义

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