Below the socket layer is the protocol layer, which contains the actual implementation of the protocol (in this case, TCP).

套接字层下面是协议层，该层包含协议的实际实现(本例中为TCP)。

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With roots from the early 1980's, it is the original implementation of the TCP/IP suite, and arguably one of the most widely supported and critical components of any operating system today.

这个源自1980年代早期的协议是TCP/IP协议的最原始实现。 而且可以说，在当今各操作系统中，它是受到最广泛支持的API，也是这些操作系统的核心组件之一。

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This paper studies the principle of TCP/IP offload engine (TOE), and proposes a design and implementation of TCP/IP stack supporting protocol offload for a TOE Gigabit-NIC.

文章研究了TCP/IP卸载引擎技术及其原理，并针对数据路径卸载的TOE千兆网卡设计实现了一个支持协议卸载的TCP/IP协议栈。

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