网络堆栈在设计上遵循模拟协议本身的分层体系结构。
The network stack, by design, follows a layered architecture modeled after the protocols themselves.
在不同的章节中，我们将会看到数据单位如何通过协议在给定的网络堆栈层来接收、传输。
In different chapters, we will see how data units are received and transmitted by the protocols that sit at a given layer in the network stack.
多点传送是IP网络协议的一项功能，它在专用多点广播路由器和协议堆栈的辅助下工作。
Multicasting is a function of the IP network protocol, with the help of special multicast routers and protocol stacks.
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