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.
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。
If you have your application's business logic layer neatly packaged in a Web service or COM object, then you may be able to build view and control logic in J2EE that makes use of that COM object.
如果您的应用程序业务逻辑层被巧妙的打包成web服务或者COM对象，您就可以把视图和控制逻辑构建在J2EE上，利用这个COM对象。
NGN has been divided into four different function layers, they are separately access function layer transfer function layer control function layer and service function layer.
之后，分别阐述了下一代网络体系的四级功能层：即接入层、传输层、控制层和业务层。
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