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第三章 DEC网的设计 DEC网的设计把网络及其相应的通信设备看作许多性质不同的层次。在每一层内,按逻辑把功能分成了若干模块。这种有结构的设计,考虑到在实现我们的网络范围内易于修改
The design of DEC network of the 3rd chapter The design of DEC network regards network and its corresponding communication apparatus as many levels of different nature. Within each layer, logically divide the function into modules. This structured design allows for easy modification within the reach of our network