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- 广播通信发送端:局域网的距离短,并且一个网段都是归于一个小的单位所有,其保密性没有广域网要求高,所以采取广播通信。-Broadcast Communications sending end: LAN short distance, and a segment is attributed to a smaller unit at all, it is no WAN confidentiality requirements, so take a broadcast communications.