Bachelor/CCNA4/en_CCNA4_v30/ch4/4_4_1/content.html


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

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          <font face="Arial" size="2">ISDN refers to a set of communication 

          protocols proposed by telephone companies to permit telephone networks 

          to carry integrated voice, video, and data services. ISDN permits 

          communication over high-quality, high-speed, digital communication 

          channels. </font>

          <p><font face="Arial" size="2">DDR is used in order to save the costs 

          of a dedicated WAN line for organizations and companies that do not 

          need a permanent connection. It can also be used as a backup by 

          organizations that use the dedicated line for critical applications.

          </font></p>

          <p><font face="Arial" size="2">An understanding of the following key 

          points should have been achieved:</font></p>

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            <li><font face="Arial" size="2">ISDN carries data, voice, and video</font></li>

            <li><font face="Arial" size="2">ISDN uses standards for addressing, 

            concepts, and signaling</font></li>

            <li><font face="Arial" size="2">ISDN uses the physical and data-link 

            layers</font></li>

            <li><font face="Arial" size="2">Interfaces and reference points for 

            ISDN</font></li>

            <li><font face="Arial" size="2">Router configuration for ISDN</font></li>

            <li><font face="Arial" size="2">Which traffic is allowed when 

            configuring DDR</font></li>

            <li><font face="Arial" size="2">Static routes for DDR</font></li>

            <li><font face="Arial" size="2">The correct encapsulation type for 

            DDR</font></li>

            <li><font face="Arial" size="2">Access lists affecting DDR traffic</font></li>

            <li><font face="Arial" size="2">Dialer interfaces</font></li>

          </ul>

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

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