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<td bgcolor="#336666"><b><font face="Arial" size="2" color="#FFFFFF">3.2</font></b></td>
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<td bgcolor="#336666" width="100%"><strong>
<font face="Arial" size="2" color="#FFFFFF">PPP Authentication</font></strong></td>
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<td bgcolor="#669999" height="25"><b>
<font face="Arial" size="2" color="#FFFFFF">3.2.6</font></b></td>
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<font size="2" color="#FFFFFF"><b><span style="font-family: Arial">PPP
encapsulation and authentication process </span></b></font></td>
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<font FACE="Arial" SIZE="2">
When the </font>
<font FACE="Courier New" SIZE="2">
<b>encapsulation ppp</b></font><font FACE="Arial" SIZE="2">
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:
<img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"></font><ul>
<li>
<font FACE="Arial" SIZE="2">
The method of authentication is determined.</font></li>
<li>
<font FACE="Arial" SIZE="2">
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.</font></li>
<li>
<font FACE="Arial" SIZE="2">
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.</font></li>
</ul>
<p>
<font FACE="Arial" SIZE="2">
The Figure <img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12">
and corresponding Figure
<img border="0" src="../../images/3.gif" align="absmiddle" width="12" height="12"> details the
CHAP authentication process.</p>
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<p>Drag and Drop: PPP Encapsulation and Authentication Process</p>
<p>When the student has completed this activity, the student
will know the steps in the PPP authentication process.</p>
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