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.
实用的网络体系结构都是层次结构，目前互联网使用的主流网络体系是TCP/IP。
The practical network architectures in use are all layered ones, TCP/IP is the mainstream network architecture used by Internet.
介绍服务元网络体系结构(SUNA)和基于非层次网络体系结构的微通信元系统架构(MCES)。
This paper presents Service Unit network architecture (SUNA) and the Micro Communication Element System (MCES) based on non-layered network architecture.
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