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📄 局域网组建技术5.htm

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<P><SPAN lang=EN-US><A href="http://old.ddvip.net/network/lan/index.asp">返回</A> 
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<P style="TEXT-ALIGN: center" align=center><STRONG><FONT color=#ff0000 
size=5>局域网组建技术6</FONT></STRONG></P>
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<P style="TEXT-ALIGN: center"><B><FONT 
face="仿宋_GB2312, 楷体_GB2312">&nbsp;&nbsp;&nbsp;</FONT></B><FONT 
face="仿宋_GB2312, 楷体_GB2312">&nbsp;豆豆技术网制作 legume 制作 修改于:2003-4-7 投稿信箱:<A 
href="mailto:web@ddvip.net">web@ddvip.net</A></FONT></P>
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      <P><FONT color=#ff3300 size=+3>第2章LAN/WAN集成</FONT><BR>L A N与WA 
      N的互连由于远程通信公司、有线电视公司和卫星通信公司三者间的激烈竞争 
      而日新月异。随着这些产业的快速发展,信息共享中存在的障碍迅速销声匿迹了,用户可以 选择任一设备工具连接到Internet 
      上。例如,在怀俄明州的小镇惠特兰有一个Internet 用户, 他可以通过电话线上网,也可以通过圆盘式卫星电视天线访问Internet 
      。而且,跨洲、跨海洋 连接L A N时,可用的选择更多。 远程通信服务可经由长距离的高速电话线连接WA N中的各个L A N。其实,WA N也是以无 
      线电、微波和卫星通信来创建的。WA N供应商间激烈的竞争促使着新型通信以迅雷不及掩耳 之势出现。2 0世纪8 0年代和9 0年代L A 
      N技术已有了巨大发展, 2 1世纪将孕育不可想像的WA N 和L A N / WA N互连的进步。 本章通过详细讲解开放系统互连(Open 
      Systems Interconnection ,O S I )模型来介绍 L A N / WA N互连。O S I模型提供了L A N / WA 

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