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关于路由转发子节点问题

请问当路由设备转发他的子节点设备的数据给到网关,当路由收到子节点的数据后,会先找邻居表,当邻居表内没有目标设备时,在从路由表中找一个设备将其发出去吗? 能否描述一下其中的原理?