在物理网络层控制路由需要将策略嵌入到拓扑中。
Controlling routing at the physical network layer embeds policy into topology.
基础网络体系结构可分为三个层次(设备层、传输层和控制层)，其上还有服务层，我们将按照从下向上的顺序分别进行介绍。
The underlying network architecture can be divided into three layers (Device layer, Transport layer, and Control layer) plus the service layer and will be introduced from bottom to top respectively.
回想一下，Internet Protocol (IP)是传输协议(通常称为传输控制协议或TCP)下面的核心网络层协议。
Recall that the Internet protocol (IP) is the core network layer protocol that sits below the transport protocol (most commonly the Transmission Control protocol, or TCP).
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