Switch Vlan PVID、VID、Tag、Untag基本觀念

 https://weihanit.wordpress.com/2017/07/27/switch%E5%9F%BA%E6%9C%AC%E8%A7%80%E5%BF%B5-pvid%E3%80%81vid%E3%80%81taguntag/

https://weihanit.wordpress.com/2017/07/27/switch-vlan%e8%a8%ad%e5%ae%9a%e7%af%84%e4%be%8b%e4%b8%80/

https://weihanit.wordpress.com/2017/07/27/switch-vlan%e7%af%84%e4%be%8b%e4%ba%8c/