作为一个软件开发者，你一定会对网络应用如何工作有一个完整的层次化的认知，同样这里也包括这些应用所用到的技术：像浏览器，HTTP, HTML，网络服务器，需求处理等等。
As a software developer, you certainly have a high-level picture of how web apps work and what kinds of technologies are involved: the browser, HTTP, HTML, web server, request handlers, and so on.
这不仅能减少网络开销和各个应用程序层次间的通信量，而且还向与业务保持一致的服务接口迈进了一大步。
This not only reduces the network overhead and chattiness between various application tiers, it also is a big step toward business alignment of service interfaces.
基础网络体系结构可分为三个层次(设备层、传输层和控制层)，其上还有服务层，我们将按照从下向上的顺序分别进行介绍。
The underlying network architecture can be divided into three layers (Device layer, Transport layer, and Control layer) plus the service layer and will be introduced from bottom to top respectively.
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