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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">2.3.4 Comparison of the OSI model and the TCP/IP model</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-v214aRIO120892/knet/v214aVID4838/2_3_4.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-v214aRIO120892/knet/v214aVID4838/2_3_4.swf"> </embed> </object>Instructor Note<p class="smtext">The purpose of this target indicator is to compare and contrast the TCP/IP model with the OSI model. Each model has advantages and disadvantages. Both are widely used. A lab activity is included so that students may practice their TCP/IP terminology.</p><p class="smtext">The "lab" activity, a paper exercise on the networking models, requires approximately 20 minutes. This TI relates to CCNA Certification Exam Objectives #1, #35, and #36.</p><p class="smtext">If you compare the OSI model and the TCP/IP model, you will notice that they have similarities and differences. Examples include:</p><p class="smtext"> <b>Similarities</b> </p><span class="smtext"> <ul type="disc"><li>Both have layers</li><li>Both have application layers, though they include very different services</li><li>Both have comparable transport and network layers</li><li>Packet-switched (not circuit-switched) technology is assumed</li><li>Networking professionals need to know both</li></ul> </span><p class="smtext"> <b>Differences</b> </p><span class="smtext"> <ul type="disc"><li>TCP/IP combines the presentation and session layer issues into its application layer</li><li>TCP/IP combines the OSI data link and physical layers into one layer</li><li>TCP/IP appears simpler because it has fewer layers, however this is a misconception. The OSI reference model, with its less complex and multiple layers, is simpler to develop and troubleshoot.</li><li>TCP/IP protocols are the standards around which the Internet developed, so the TCP/IP model gains credibility just because of its protocols. In contrast, typically networks are not built on the OSI protocol, even though the OSI model is used as a guide.</li></ul> </span><a href="#" onClick="javascript:launchReference('knet-v214aRIO125208', 'null', 'null');void(null);">Lab Activity</a><p class="smtext">In this lab, you will learn to relate the seven layers of the OSI model to the four layers of the TCP/IP model as well as name the primary TCP/IP protocols and utilities that operate at each layer.</p>Web Links<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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