NAC解決的問題有哪些呢？
NAC是從國外引入的，國外對NAC的說明是：
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?
我簡稱WACC。
國人的理解是下面的圖
就是：你是誰，你安全嗎，你可以做什麼，你在做什麼，及4W。