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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_1/content.html | |
| download | Studium-master.tar.gz Studium-master.tar.bz2 | |
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+
+<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">
+ 2.3.1</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 communication</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 size="2" face="Arial">WANS are considered to be a set of data
+ links connecting routers on LANs. User end stations and servers on LANs
+ exchange data. Routers pass data between networks across the
+ data links.</font><p><font size="2" face="Arial">Because of cost and
+ legal reasons, a communications provider or a common carrier normally
+ owns the data links that make up a WAN. The links are made available to
+ subscribers for a fee and are used to interconnect LANs or connect to
+ remote networks. WAN data transfer speed (bandwidth) is considerably
+ slower than the 100 Mbps that is common on a LAN. The charges for link provision are
+ the major cost element of a WAN and the design must aim to provide
+ maximum bandwidth at acceptable cost. With user pressure to provide more
+ service access at higher speeds and management pressure to contain cost,
+ determining the optimal WAN configuration is not an easy task.</font></p>
+ <p><font face="Arial" size="2">WANs carry a variety of traffic types
+ such as data, voice, and video. The design selected must provide
+ adequate capacity and transit times to meet the requirements of the
+ enterprise. Among other specifications, the design must consider the
+ topology of the connections between the various sites, the nature of
+ those connections, and bandwidth capacity. </font>
+ </p>
+ <p><font size="2" face="Arial">Older WANs often consisted of data links
+ directly connecting remote mainframe computers.
+ <img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"> Today’s
+ WANs, though, connect geographically separated LANs.
+ <img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12"> End-user
+ stations, servers, and routers communicate across LANs, and the WAN data
+ links terminate at local routers. By exchanging Layer 3 address
+ information about directly connected LANs, routers determine the most
+ appropriate path through the network for the required data streams.
+ Routers can also provide quality of service (QoS) management, which
+ allots priorities to the different traffic streams.
+ </font>
+ </p>
+ <p><font size="2" face="Arial">Because the WAN is merely a set of
+ interconnections between LAN based routers, there are no services on the
+ WAN. WAN technologies function at the lower three layers of the OSI
+ reference model.
+ <img border="0" src="../../images/3.gif" align="absmiddle" width="12" height="12"> Routers
+ determine the destination of the data from the network layer headers and
+ transfer the packets to the appropriate data link connection for
+ delivery on the physical connection.</font></p>
+ <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">
+ <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>Introduction to WAN Technologies<p>
+ <a target="_blank" href="http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/introwan.htm">
+ http://www.cisco.com/univercd/cc/</a><br>
+ <a target="_blank" href="http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/introwan.htm">
+ td/doc/cisintwk/ito_doc/introwan.htm</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>
+ </td>
+ </tr>
+ </table>
+
+</body>
+
+</html>
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