有很多人肯定对设定子网掩码这个不熟悉，很头疼，那么我现在就告诉大家一个很容易算子网掩码的方法，帮助一下喜欢偷懒的人-sure a lot of people to set the subnet mask not familiar with a headache, then I will tell you a very easy way of counting subnet mask, a helping hand to people like the lazy