Bachelor/CCNA4/en_CCNA4_v30/ch3/3_2_3/content.html


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    <td bgcolor="#336666"><b><font face="Arial" size="2" color="#FFFFFF">3.2</font></b></td>

    <td bgcolor="#336666"><img border="0" src="../../images/transdot.gif" width="10" height="1"></td>

    <td bgcolor="#336666" width="100%"><strong>

    <font face="Arial" size="2" color="#FFFFFF">PPP Authentication</font></strong></td>

    <td width="9" bgcolor="#336666">&nbsp;</td>

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    <td bgcolor="#669999" height="25" width="18">&nbsp;</td>

    <td bgcolor="#669999" height="25"><b>

    <font face="Arial" size="2" color="#FFFFFF">3.2.3</font></b></td> 

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    <td bgcolor="#669999" height="25" width="100%"><strong>

    <font face="Arial" size="2" color="#FFFFFF">PPP authentication protocols</font></strong></td>

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          <font face="Arial" size="2">The authentication phase of a 

          PPP session is optional. After the link has been established and the 

          authentication protocol chosen, the peer can be authenticated. If it 

          is used, authentication takes place before the network layer protocol 

          configuration phase begins.  </font>

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          <font face="Arial" size="2">The authentication options require that 

          the calling side of the link enter authentication information. This 

          helps to ensure that the user has the permission of the network 

          administrator to make the call. Peer routers exchange authentication 

          messages. </font>

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          <font face="Arial" size="2">When configuring PPP authentication, the 

          network administrator can select Password Authentication Protocol 

          (PAP) or Challenge Handshake Authentication Protocol (CHAP).

          <img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"> 

          <img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12"> In 

          general, CHAP is the preferred protocol.</font></p>

          <p><font face="Arial" size="2">&nbsp; &nbsp;&nbsp; </font>

          
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