由于IP地址资源有限，本文介绍IP地址的格式，并且说明怎样进行IP地址的分配和子网地址的划分。
But the IP address have limited resource, this paper introduces the formers of IP address and sub-net address.
这种层次划分的原因在于试图将它与端点地址选择决策流程结合起来。
The reasoning is an attempt to align it with the endpoint address selection decision process. This process assumes the following steps.
具体地址分配的过程也会按照层次化的方式划分，每台主要的电气设备会向其控制器请求一个地址段。
The allocation process is again done in a hierarchical zoned way, with each major application requesting a block of addresses from its controller.
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