NAC解决的问题有哪些呢？
NAC是从国外引入的，国外对NAC的说明是：
NAC was intended to solve real problems and answer real questions: who is connecting to my network? Are they healthy? Can I control where they go? Can I shut them off if they misbehave?
我简称WACC。
国人的理解是下面的图
就是：你是谁，你安全吗，你可以做什么，你在做什么，及4W。