Routers operate at the network layer in the network model, one step above Ethernet.
路由器在整个网络模型的网络层运行，比以太网高了一级。
The most important characteristic of this model is one-step integration.
和以往同类模型相比，此模型的最大特点是同步综合。
The most important characteristic of this model is one-step integration.
和以往同类模型相比，此模型的最大特点是同步综合。
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