子网掩码技术专题
是不是常常由于弄不懂子网掩码而犯晕，像地址和总、子网划分等等。这儿对这点写的太具体了，关于IP、子网的具体阐述。(Are you often confused because you don't understand the subnet mask, such as address and total, subnet division and so on. This is too specific to write here, the specific elaboration of IP and subnet.)
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