1、带宽资源耗尽。 2、每台计算机都浪费许多时间处理无关的广播数据。 3、网络变得无法管理，任何错误都可能导致整个网络瘫痪。 4、每台计算机都可以监听到其他计算机的通信。 -1, run out of bandwidth resources. 2, each computer has nothing to do spend most of their time dealing with the broadcast data. 3, the network has become