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广播式网络就是某太计算机发送的消息，网络内所有计算机都可以收到点对点网络就是通过中间设备直接发到需要接收的计算机。其他计算机收不到这个消息
这俩种方式存在与局域网中，WAN中需要的不只着俩种方式，电信的宽带业务就是PPPOE拨号
点对点式网络
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