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<html>    <head>        <meta content="en-us" http-equiv="Content-Language">        <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">        <link type="text/css" rel="stylesheet" href="../../../../../css/ccna.css">        <script src="../../../../../js/framesetHelper.js" language="JavaScript"></script><script language="JavaScript">        window.scrollTo(0,0);        function newPage(pageID) {            alert("COMMING SOON!!\nThis feature is currently in development.");        }        function launchMoreInfo(oid) {            dash = oid.indexOf('-');            sub1 = oid.substring(0,dash);            sub2 = oid.substring(dash+1);                                            // this is an URL base on the                                        // system that generated the static                                        // download of the curriculum.            httpref = "http://nomar.sdf.cisco.com/servlet/org.cli.delivery.rendering.servlet.MIServlet/Static=true,LMSID=DTUI,Engine=dynamic,Theme=cnamstheme,Style=ccna,Language=en,Version=2,RootID=knet-v214aCV47051/CHAPID=null/RLOID=null/RIOID=null/";                        newref = httpref + sub1 +"/"+ sub2 +"/moreinfoframeset.html";            //alert("new newref :\n" + newref);            window.open(newref,'MoreInfo','toolbar=no,status=yes,menubar=no,location=no,scrollbars=yes,height=442,width=756,left=20,top=20,resizable=yes')        }        function launchContentResource(contentID) {            top.currentSupport = 0;                        dash = contentID.indexOf('-');            sub1 = contentID.substring(0,dash);            sub2 = contentID.substring(dash+1);                        numbackParams = "CHAPID=" + "knet-v214aCH47502" + "/RLOID=" + "knet-v214aRLO47526" + "/RIOID=" + "knet-v214aRIO120880";                        ContentRef = "../../../../../"+ numbackParams + "/"+ sub1 +"/"+ sub2 +"/";                        eval('parent.frames.content_frame.location.href="'+ContentRef+'content.html"');            eval('parent.frames.media_frame.location.href="'+ContentRef+'media.html"');            eval('parent.frames.navigation_frame.location.href="'+ContentRef+'contentresourcenav.html"');            top.currentSupport++;            top.firstSupportPage = contentID;            top.prevPage = contentID;            top.contentResourceID = contentID;        }                        function launchReference(rioID, rloID, chapterID)        {            contentID = "knet-v214aCV47051";            dash = contentID.indexOf('-');            sub1 = contentID.substring(0,dash);            sub2 = contentID.substring(dash+1);                        numbackParams = "CHAPID=" + chapterID + "/RLOID=" + rloID + "/RIOID=" + rioID;                        ContentRef = "../../../../../"+ numbackParams + "/"+ sub1 +"/"+ sub2 +"/";        			            eval('top.frames.main_frame.location.href="'+ContentRef+'referencecontroller_crf.html"');                        chapter = "knet-v214aCH47502";            ch_dash = chapter.indexOf('-');            ch_sub1 = chapter.substring(0,ch_dash);            ch_sub2 = chapter.substring(ch_dash+1);                        params = "CHAPID=" + chapter + "/RLOID=" + "knet-v214aRLO47526" + "/RIOID=" + "knet-v214aRIO120880";                        returnRef = "../../../../../"+ params + "/"+ ch_sub1 +"/"+ ch_sub2 +"/pageframeset.html";                                    top.prevPage = returnRef;                }        function launchFile(filepath) {              newWindow = window.open(filepath,"","top=70,left=120,width="+(screen.width*.50)+",height="+(screen.height*.50)+",resizable=yes,scrollbars=yes,toolbar=yes,menubar=yes,status=yes");            /*            if (is.ie && filepath.lastIndexOf(".pdf") != -1) {                pageTimer = setInterval("winLoadCheck()", 1000);            }            */        }        function winLoadCheck() {            if (newWindow.document.readyState == 'complete') {                           clearInterval(pageTimer);                newWindow.location.reload();            }        }          // BrowserCheck Object  // provides most commonly needed browser checking variables  // 19990326  // Copyright (C) 1999 Dan Steinman  // Distributed under the terms of the GNU Library General Public License  // Available at http://www.dansteinman.com/dynapi/  function BrowserCheck() {  	var b = navigator.appName  	if (b=="Netscape") this.b = "ns"  	else if (b=="Microsoft Internet Explorer") this.b = "ie"  	else this.b = b  	this.v = parseInt(navigator.appVersion)  	this.ns = (this.b=="ns" && this.v>=4)  	this.ns4 = (this.b=="ns" && this.v==4)  	this.ns5 = (this.b=="ns" && this.v==5)  	this.ie = (this.b=="ie" && this.v>=4)  	this.ie4 = (navigator.userAgent.indexOf('MSIE 4')>0)  	this.ie5 = (navigator.appVersion.indexOf('MSIE 5.0')>0)  	this.ie55 = (navigator.appVersion.indexOf('MSIE 5.5')>0)  	if (this.ie5) this.v = 5  	this.min = (this.ns||this.ie)  }  // automatically create the "is" object  is = new BrowserCheck()</script>    </head>    <body onLoad="window.focus();" alink="#000000" vlink="#000000" link="#000000" bgcolor="#E7E7E7" background="../../../../../images/ccna/common/bg.gif">        <table width="100%" cellspacing="0" cellpadding="2" border="0"><tr>                <td bgcolor="#000000"><img height="1" width="2" border="0" src="../../../../../images/ccna/common/transdot.gif"></td><td class="riohdr"><img height="1" width="2" border="0" src="../../../../../images/ccna/common/transdot.gif"></td><td valign="top" class="riohdr">2</td><td width="100%" class="riohdr">                    <table width="90%" cellpadding="0" cellspacing="0" border="0">                        <tr>                            <td class="riohdr">The OSI Model</td>                        </tr>                    </table>                </td>            </tr>            <tr>                <td colspan="4">                    <table width="90%" cellspacing="0" cellpadding="0" border="0">                        <tr>                            <td class="smtext">                                <p>                                </p><p>In the late 1980s and early 1990s there was a significant increase in the number and overall size of networks. However, many of the early networks were built using different implementations of hardware and software. This resulted in many of the networks being incompatible and communication between networks was quite difficult. To address this problem, the International Organization for Standardization (ISO) researched many network schemes. The ISO recognized that there was a need to create a network model that would help network builders implement networks that could communicate and work together (interoperability). As a consequence, the OSI reference model was released in 1984.</p><p>This chapter explains how standards ensure greater compatibility and interoperability between various types of network technologies. In this chapter, you will learn how the OSI reference model networking scheme supports networking standards. In addition, you will see how information or data makes its way from application programs (such as spreadsheets) through a network medium (such as wires) to other application programs located on other computers on a network. This chapter will discuss the basic functions of each layer of the OSI model. This will serve as a foundation designing, building, and troubleshooting networks.</p></td>                        </tr>                    </table>                </td>            </tr></table>        <p>        </p>        <table width="100%" cellspacing="0" cellpadding="2" border="0" valign="bottom">            <tr>                <td></td>            </tr>        </table>    </body></html>
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