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怎么定义“断网”这个事件

如题,对于某两个节点A和B,对于以下情况怎么来定义断网这个事件

1)A:协调器、B:路由器

2)A:协调器    B:终端节点

3)A:路由器   B:路由器

4)A:路由器   B:终端节点