其涉及的内容包括硬件子系统和高层协议栈两部分。
Its content include hardware subsystem and high layer protocol stack.
论文提出了一个三层网络子系统结构：内核级协议无关层、内核级协议相关层和用户级协议栈。
We carry out a three layers network subsystem structure that is protocol independent layer in kernel, protocol dependent layer in kernel and user level protocol stack.
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