(The article in the third issue of optical communication research in 2006 is a little old, but the content is still so typical. Access authentication technology has supported the development of broadband access. The article first gives the basic model of user system (PPPoE, web, 802.1x), and based on these, analyzes and compares the technologies of these three users. The article is downloaded from Wanfang database. It can be opened after trying on several machines. If you encounter the phenomenon that it cannot be opened, please contact me.)