Controlling routing at the physical network layer embeds policy into topology.

在物理网络层控制路由需要将策略嵌入到拓扑中。

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Note also that the routing of messages is accomplished by reconnecting the physical network.

还要注意，消息的路由是通过重新连接物理网络来完成的。

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Once again, this is the practice of embedding security policy into the physical network design.

同样，这是将安全策略嵌入物理网络设计中的一种实践。

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Moreover, there has been a rapid decoupling of the firm that owns the physical network from the company that supplies the services atop it.

ECONOMIST: Internet regulation

Novell users have been pressing Cisco to enable strong NDS ties because they have already deployed Novell's directory and are anxious to use it as a physical network management tool.

CNN: Cisco to sign up for NDS

Network engineering is not a glamorous profession, and the physical structures of the greatest network ever built lack the grandeur of a hydroelectric dam or a continent-spanning railway.

ECONOMIST: How the internet works