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diff --git a/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_2/content.html b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_2/content.html new file mode 100644 index 0000000..944ee5a --- /dev/null +++ b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_1_2/content.html @@ -0,0 +1,183 @@ +<html>
+
+<head>
+<meta http-equiv="Content-Language" content="en-us">
+<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
+
+
+
+<title>Content</title>
+<base target="_self">
+</head>
+
+<body background="../../images/bg.gif" topmargin="0" leftmargin="0" marginheight="0" marginwidth="0" onLoad="window.focus();" link="#808080" vlink="#808080" alink="#808080">
+
+<table border="0" cellpadding="0" cellspacing="0" width="100%">
+ <tr>
+ <td bgcolor="#336666" width="18" valign="top">
+ <img border="0" src="../../images/content_lines.gif" width="16" height="25">
+ <img border="0" src="../../images/transdot.gif" width="2" height="1"></td>
+ <td bgcolor="#336666"><b><font face="Arial" size="2" color="#FFFFFF">2</font></b><font face="Arial" size="2" color="#FFFFFF"><b>.1</b></font></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">WAN Technologies Overview</font></strong></td>
+ <td width="9" bgcolor="#336666"> </td>
+ </tr>
+ <tr>
+ <td bgcolor="#669999" height="25" width="18"> </td>
+ <td bgcolor="#669999" height="25"><b>
+ <font face="Arial" size="2" color="#FFFFFF">2.1.2</font></b></td>
+ <td bgcolor="#669999"><img border="0" src="../../images/transdot.gif" width="10" height="1"></td>
+ <td bgcolor="#669999" height="25" width="100%"><strong>
+ <font face="Arial" size="2" color="#FFFFFF">WAN devices</font></strong></td>
+ <td bgcolor="#669999" height="25" width="9"> </td>
+ </tr></table>
+
+<table border="0" cellpadding="0" cellspacing="0" width="95%" bordercolor="#111111">
+ <tr>
+ <td width="15"></td>
+ <td>
+
+ <font FACE="Arial" SIZE="2" COLOR="#000000">
+ WANs are groups of LANs connected together with communications links
+ from a service provider. Because the communications links cannot plug
+ directly into the LAN, it is necessary to identify the various pieces
+ of interfacing equipment.
+ <img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"><p>
+ LAN-based computers with data to transmit send data to a router that
+ contains both LAN and WAN interfaces.
+ <img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12">
+ The router will use the Layer 3 address information to deliver the
+ data on the appropriate WAN interface. Routers are active and
+ intelligent network devices and therefore can participate in network
+ management. Routers manage networks by providing dynamic control over
+ resources and supporting the tasks and goals for networks. Some of
+ these goals are connectivity, reliable performance, management
+ control, and flexibility.</p>
+ <p>The communications link needs signals in an appropriate format. For
+ digital lines, a channel service unit (CSU) and a data service
+ unit (DSU) are required. The two are often combined into a single
+ piece of equipment, called the CSU/DSU. The CSU/DSU may also be built
+ into the interface card in the router.
+ <img border="0" src="../../images/3.gif" align="absmiddle" width="12" height="12"></p>
+ <p>A modem is needed if the local loop is analog rather than digital.
+ <img border="0" src="../../images/4.gif" align="absmiddle" width="12" height="12"> Modems
+ transmit data over voice-grade telephone lines by modulating and
+ demodulating the signal. The digital signals are superimposed on an
+ analog voice signal that is modulated for transmission. The modulated
+ signal can be heard as a series of whistles by turning on the internal
+ modem speaker. At the receiving end the analog signals are returned to
+ their digital form, or demodulated. </p>
+ <p>When ISDN is used as the communications link, all equipment
+ attached to the ISDN bus must be ISDN-compatible. Compatibility is
+ generally built into the computer interface for direct dial
+ connections, or the router interface for LAN to WAN connections.
+ Older equipment without an ISDN interface requires an ISDN
+ terminal adapter (TA) for ISDN compatibility.</p>
+ <p>
+ Communication servers concentrate dial-in user communication and remote access to a LAN. They may have a mixture of analog and
+ digital (ISDN) interfaces and support hundreds of simultaneous users.</p>
+
+ <TABLE bgcolor="#B0AFAF" width="95%" border="0" cellspacing="0" cellpadding="0">
+ <TR>
+ <TD valign="top">
+ <TABLE bgcolor="#669999" width="100%" cellspacing="0" cellpadding="0" border="0">
+ <TR>
+ <TD width="5">
+ <img border="0" src="../../images/lab_toplft.gif" width="116" height="23"></TD>
+ <TD><IMG alt="" height="1" width="3" src="../../images/s.gif"></TD><TD align="right" valign="top">
+ <IMG alt="" src="../../images/corner_ur_7.gif" width="7" height="7"></TD>
+ </TR>
+ </TABLE>
+
+ <TABLE bgcolor="#B0AFAF" width="100%" cellspacing="0" cellpadding="0" border="0">
+ <TR>
+ <TD>
+ <TABLE width="100%" cellpadding="2" cellspacing="0" border="0" bordercolor="#111111">
+ <TR>
+ <TD bgcolor="#ffffff" width="15"> </TD>
+ <TD bgcolor="#ffffff"><font FACE="Arial" SIZE="2" COLOR="#000000">
+ <p><font color="#808080">
+ <a href="javascript:void(0)" onClick="window.open('../../activities/ch02/activity_2_1_2.html','Interactivity','width=740,height=390,toolbar=0,resizable=yes,scrollbars=0,screenX=26,screenY=38,left=26,top=38');">
+ <img border="0" src="../../images/media_icon.gif" width="25" height="25"></a> <b>
+ <a onClick="window.open('../../activities/ch02/activity_2_1_2.html','Interactivity','width=740,height=390,toolbar=0,resizable=yes,scrollbars=0,screenX=26,screenY=38,left=26,top=38');" href="javascript:void(0)">Interactive Media Activity</a></b></font></p>
+ </font><font FACE="Arial" SIZE="2" COLOR="#808080">
+ <p>Crossword Puzzle: WAN Devices and Interfaces</p>
+ <p>Upon completing this activity, the student
+ will be able to describe devices and interfaces associated with
+ WAN connections.</p>
+ </font><font FACE="Arial" SIZE="2" COLOR="#000000">
+ <p><IMG alt="" height="2" width="1" src="../../images/s.gif"></p></TD>
+ </TR>
+ </TABLE>
+ </TD>
+ </TR>
+ </TABLE>
+ </TD>
+ </TR>
+ </TABLE>
+
+
+
+
+ <TABLE bgcolor="#B0AFAF" width="95%" border="0" cellspacing="0" cellpadding="0">
+ <TR>
+ <TD valign="top">
+ <TABLE bgcolor="#669999" width="100%" cellspacing="0" cellpadding="0" border="0">
+ <TR>
+ <TD width="5">
+ <img border="0" src="../../images/lab_toplft.gif" width="116" height="23"></TD>
+ <TD><IMG alt="" height="1" width="3" src="../../images/s.gif"></TD><TD align="right" valign="top">
+ <IMG alt="" src="../../images/corner_ur_7.gif" width="7" height="7"></TD>
+ </TR>
+ </TABLE>
+
+ <TABLE bgcolor="#B0AFAF" width="100%" cellspacing="0" cellpadding="0" border="0">
+ <TR>
+ <TD>
+ <TABLE width="100%" cellpadding="2" cellspacing="0" border="0" bordercolor="#111111">
+ <TR>
+ <TD bgcolor="#ffffff" width="15"> </TD>
+ <TD bgcolor="#ffffff"><font FACE="Arial" SIZE="2" COLOR="#000000">
+ <p><font color="#808080">
+ <img border="0" src="../../images/links_icon.gif" width="25" height="25">
+ <b>Web Links</b></font></p>
+ </font><font FACE="Arial" SIZE="2" COLOR="#808080">
+
+ <p>WAN<p>
+ <a target="_blank" href="http://www.cisco.com/en/US/tech/tk713/tech_topology_and_network_serv_and_protocol_suite_home.html">
+ http://www.cisco.com/en/US/tech/tk713/
+ tech_topology_and_network_ serv_and_protocol_suite_ home.html</a></font></p>
+
+ <p>
+ <IMG alt="" height="2" width="1" src="../../images/s.gif"></p>
+ </TD>
+ </TR>
+ </TABLE>
+ </TD>
+ </TR>
+ </TABLE>
+ </TD>
+ </TR>
+ </TABLE><p>
+
+ <font face="Arial" size="2"> </font>
+ </font>
+
+
+ </TD>
+ </TR>
+ </TABLE>
+ </TD>
+ </TR>
+ </TABLE>
+
+
+</font>
+ </td>
+ </tr>
+ </table>
+
+</body>
+
+</html>
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