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.
sk_buffs为所有网络层提供有效的缓冲器处理和流控制机制。
Sk_buffs provide efficient buffer handling and flow control mechanisms for all networking layers.
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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