The PPP protocol is currently one of the most widely used protocols on the Wide Area Network. It has the advantages of simplicity, user verification capability, and IP Address allocation. Www.2cto.com is used to establish a communication link between the client and the access server of the carrier through PPP. At present, broadband access is becoming a trend to replace dial-up Internet access. In today's ever-changing broadband access technology, PPP has also developed new applications. A typical application is that in the ADSL (asymmetric data user Loop, asyuncrical Digital Subscriber Loop) access mode, PPP and other protocols jointly derive a new protocol that meets the broadband access requirements, for example, PPPoE (PPP over Ethernet) and PPPoA (PPP over ATM ). Www.2cto.com uses Ethernet resources to run PPP over Ethernet for user authentication and access. PPPoE protects users' Ethernet resources and meets ADSL access requirements. It is currently the most widely used technical standard in ADSL access methods. Similarly, PPPoA is used to manage user authentication by running the PPP protocol on an ATM (Asynchronous Transfer Mode) network. It works in the same way as PPPoE. The difference is that it runs on an ATM network, while PPPoE runs on an Ethernet network, so it must adapt to the ATM and Ethernet standards respectively. The simple and complete PPP protocol www.2cto.com has made it widely used. I believe it can play a greater role in the future development of network technology.