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<html> <head> <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"> var pageLoaded = false; var current = ''; var currentChapter = 'knet-v214aCH47502'; 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_pf.html"'); } function PrevPage() { top.currentSupport--; if (top.currentSupport <= 0) { returnContent(); } else { if (top.firstSupportPage == top.contentResourceID) { returnContent(); } else if (top.prevPage == quizID) { launchQuiz(); } else { launchReview(); } } } function launchReview(reviewID) { top.currentSupport = 0; chapterID = "knet-v214aCH47502"; nbparams = "CHAPID="+chapterID+"/RLOID="+"knet-v214aRLO47529"+"/RIOID="+reviewID; dash = chapterID.indexOf('-'); sub1 = chapterID.substring(0,dash); sub2 = chapterID.substring(dash+1); ContentRef = "../../../../../"+ nbparams +"/"+ sub1 +"/"+ sub2 +"/"; //alert(ContentRef); eval('top.frames.main_frame.location.href="'+ContentRef+'pageframesetrio.html"'); //added for navigating between Quiz and Review and back to regular Chapter pages top.currentSupport++; top.firstSupportPage = reviewID; top.prevPage = reviewID; top.contentResourceID = ''; } function launchQuiz(quizID) { top.currentSupport = 0; chapterID = "knet-v214aCH47502"; nbparams = "CHAPID="+chapterID+"/RLOID="+"knet-v214aRLO47531"+"/RIOID="+"knet-v214aRIO120895"; dash = chapterID.indexOf('-'); sub1 = chapterID.substring(0,dash); sub2 = chapterID.substring(dash+1); ContentRef = "../../../../../"+ nbparams +"/"+ sub1 +"/"+ sub2 +"/"; //alert(ContentRef); eval('top.frames.main_frame.location.href="'+ContentRef+'pageframesetrio.html"'); //added for navigating between Quiz and Review and back to regular Chapter pages top.currentSupport++; top.firstSupportPage = quizID; top.prevPage = quizID; top.contentResourceID = ''; } function returnContent() { rioID = top.currentPage; rloID = top.currentRLO; ContentID = top.currentChapter; top.firstSupportPage = ''; top.prevPage = ''; top.contentResourceID = ''; top.currentSupport = 0; nbparams = "CHAPID="+ContentID+"/RLOID="+rloID+"/RIOID="+rioID; dash = ContentID.indexOf('-'); sub1 = ContentID.substring(0,dash); sub2 = ContentID.substring(dash+1); ContentRef = "../../../../../"+ nbparams +"/"+ sub1 +"/"+ sub2 +"/" eval('top.frames.main_frame.location.href="'+ContentRef+'pageframesetrio.html"'); } </script> </head> <body leftmargin="20" topmargin="10" marginwidth="30" marginheight="10" bgcolor="#FFFFFF" onLoad="window.focus();" background="../../../../../images/ccna/common/lab/bglab.gif"> <table bgcolor="#000000" cellspacing="0" width="100%" border="0"> <tr> <td width="100%"> <table cellpadding="4" cellspacing="1" width="100%" border="0"> <tr> <td width="10%" bgcolor="#FFFFFF" valign="top"> <table cellpadding="0" cellspacing="0" width="100%" border="0"> <tr> <td width="33%"><script language="JavaScript"> //if (parent.parent.getTopName() == "chapterframeset") //{ var imgSource = '../../../../../images/ccna/common/lab/labback.gif'; document.write('<a href="javascript:PrevPage();">'); document.write('<img src="' + imgSource + '" border="0">'); document.write('</a>'); //} </script></td><td width="33%"></td> </tr> </table> <p> </p> </td><td bgcolor="#FFFFFF" valign="top"> <p align="left"> <span class="resourceTitle">2.3.5 Use of the OSI and the TCP/IP models in the curriculum</span> </p><object height="100%" width="100%" codebase="http://active.macromedia.com/flash4/cabs/swflash.cab#version=4,0,0,0" classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"><param name="movie" value="../../../../../CHAPID=knet-v214aCH47502/RLOID=knet-v214aRLO47529/RIOID=knet-v214aRIO120893/knet/v214aVID35251/2_3_5.swf"><param value="high" name="quality"> <embed height="100%" width="100%" pluginspage="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" quality="high" src="../../../../../CHAPID=knet-v214aCH47502/RLOID=knet-v214aRLO47529/RIOID=knet-v214aRIO120893/knet/v214aVID35251/2_3_5.swf"> </embed> </object>Instructor Note<p class="smtext">The purpose of this target indicator is for the student to articulate why the OSI model is used throughout the CCNA curriculum. It is the standard for teaching and learning. It is an international standard. It makes distinctions that are helpful in analyzing and troubleshooting internetworks.</p><p class="smtext">Although TCP/IP protocols are the standards with which the Internet has grown, this curriculum will use the OSI model for the following reasons:</p><span class="smtext"> <ul type="disc"><li>It is a worldwide, generic, protocol-independent standard.</li><li>It has more details, which makes it more helpful for learning and troubleshooting.</li></ul> </span><p class="smtext">Many networking professionals have different opinions on which model to use. You should become familiar with both. You will use the OSI model as the microscope through which to analyze networks, but you will also use the TCP/IP protocols throughout the curriculum. Remember that there is a difference between a model (for example, layers, interfaces, and protocol specifications) and an actual protocol that is used in networking. You will use the <u>OSI model</u> and the <u>TCP/IP protocols</u>. </p><p class="smtext">You will focus on TCP as an OSI Layer 4 protocol, IP as an OSI Layer 3 protocol, and Ethernet as a Layer 2 and Layer 1 technology. The diagram in the figure shows that later in the course you will examine Ethernet, one particular data link and physical layer technology out of the many choices available. If you want a preview of Ethernet, visit the website below.</p><a href="#" onClick="javascript:launchReference('knet-v214aRIO125209', 'null', 'null');void(null);">Lab Activity</a><p class="smtext">In this lab, you will identify the characteristics of each layer as well as the terminology and physical devices that operate at each layer.</p><a href="#" onClick="window.open('../../../../../CHAPID=null/RLOID=null/RIOID=knet-v214aRIO120893/knet/v214aRIOv2141000/iaactivity.html','LabActivity','width=742,height=390,toolbar=0,scrollbars=0,left=26,top=38');void(null);">Interactive Lab Activity</a><p class="smtext">Test your knowledge of the functions of the OSI Model layers.</p>Web Links<a target="_blank" href="http://www.ethermanage.com/ethernet/ethernet.html"><span class="smtext">Ethernet website</span></a><br><a target="_blank" href="http://oac3.hsc.uth.tmc.edu/staff/snewton/tcp-tutorial/"><span class="smtext">Introduction to the Internet Protocols</span></a></td> </tr> </table> </td> </tr> </table> </body></html>⌨️ 快捷键说明
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