command is used either PAP or CHAP authentication can be optionally added. If no authentication is specified the PPP session starts immediately. If authentication is required the process proceeds through the following steps:

• The method of authentication is determined.
• The local database or security server, which has a username and password database, is checked to see if the given username and password pair matches.
• The process checks the authentication response sent back from the local database. If it is a positive response, the PPP session is started. If negative, the session is terminated.

The Figure and corresponding Figure  details the CHAP authentication process.

Interactive Media Activity Drag and Drop: PPP Encapsulation and Authentication Process When the student has completed this activity, the student will know the steps in the PPP authentication process.