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| author | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
|---|---|---|
| committer | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
| commit | 33613a85afc4b1481367fbe92a17ee59c240250b (patch) | |
| tree | 670b842326116b376b505ec2263878912fca97e2 /Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_2/content.html | |
| download | Studium-master.tar.gz Studium-master.tar.bz2 | |
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| -rw-r--r-- | Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_2/content.html | 129 |
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diff --git a/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_2/content.html b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_2/content.html new file mode 100644 index 0000000..8a030d2 --- /dev/null +++ b/Bachelor/CCNA4/en_CCNA4_v30/ch2/2_3_2/content.html @@ -0,0 +1,129 @@ +<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"><font face="Arial" size="2" color="#FFFFFF"><b>2.</b></font><b><font face="Arial" size="2" color="#FFFFFF">3</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">WAN Design</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">
+ 2.3.2</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">Steps in WAN design</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>
+ <p><font size="2" face="Arial">Designing a WAN can be a challenging task, but
+ approaching the design in a systematic manner can lead to superior
+ performance at a reduced cost. Many WANs have evolved over time,
+ therefore many of the guidelines discussed here may not have been
+ considered. Every time a modification to an existing WAN is
+ considered, the steps in this module should be followed. WAN
+ modifications may arise from changes such as an expansion in the
+ enterprise the WAN serves, or accommodation of new work practices and
+ business methods.</font></p>
+ <p><font size="2" face="Arial">Enterprises install WAN connectivity
+ because there is a need to move data in a timely manner between
+ external branches. The WAN is there to support the enterprise
+ requirements. Meeting these requirements incurs costs, such as
+ equipment provisioning and management of the data links.</font></p>
+ <p><font size="2" face="Arial">In designing the WAN, it is necessary to know what data traffic must
+ be carried, its origin, and its destination. WANs carry a variety of
+ traffic types with varying requirements for bandwidth, latency, and
+ jitter. <img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"></font></p>
+ <p><font size="2" face="Arial">For each pair of end points and for each traffic type, information is
+ needed on the various traffic characteristics.
+ <img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12"> Determining this may
+ involve extensive studies of and consultation with the network users.
+ The design often involves upgrading, extending, or modifying an
+ existing WAN. Much of the data needed can come from existing network
+ management statistics.</font></p>
+ <p><font size="2" face="Arial">Knowing the various end points allows the selection of a topology or
+ layout for the WAN. The topology will be influenced by geographic
+ considerations but also by requirements such as availability. A high
+ requirement for availability will require extra links that provide
+ alternative data paths for redundancy and load balancing.</font></p>
+ <p><font size="2" face="Arial">With the end points and the links chosen, the necessary bandwidth can
+ be estimated. Traffic on the links may have varying requirements for
+ latency and jitter. With the bandwidth availability already
+ determined, suitable link technologies must be selected. </font></p>
+ <p><font size="2" face="Arial">Finally, installation and operational costs for the WAN can be
+ determined and compared with the business need driving the WAN
+ provision.</font></p>
+ <p><font size="2" face="Arial">In practice, following the steps shown in
+ Figure <img border="0" src="../../images/3.gif" align="absmiddle" width="12" height="12"> is seldom a linear
+ process. Several modifications may be necessary before a design is
+ finalized. Continued monitoring and re-evaluation are also required
+ after installation of the WAN to maintain optimal performance.</font></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_3_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_3_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>Drag and Drop: WAN Design Steps</p>
+ <p>When the student has completed this activity, the student
+ will be able to identify the basic steps in designing a WAN.</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>
+
+
+ <p>
+
+ </td>
+ </tr>
+ </table>
+
+</body>
+
+</html>
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