计算机网络怎么划分 ipv4? 子网怎么划分

ipv4? 子网怎么划分 划分方式及方法有哪些 ipv4哪些类

http://minggj.blog.51cto.com/130110/240398/

参考：http://www.doc88.com/p-9959019938455.html
http://wenku.baidu.com/link?url=26i3XN83mw1g-HgbbgN6DXfOpiTWzjdfSXaKu3wNX3HTJjUvLfj1EocqFkH5YZBheydbykjPlt990K9qjfS5WOVhmTyEQf2qcmDX5cVSnDa

http://baike.baidu.com/link?url=9NYjDsX9DRT6hweu0BtCaRcdzHsqd-xwsq8hyppReR7MOLNPcrRbUYO08oQ53aB4PcqJi1n1oAN4aIUYWrmcd_