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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-v214aCH47504'; 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-v214aCH47504"; nbparams = "CHAPID="+chapterID+"/RLOID="+"knet-v214aRLO47543"+"/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-v214aCH47504"; nbparams = "CHAPID="+chapterID+"/RLOID="+"knet-v214aRLO47547"+"/RIOID="+"knet-v214aRIO121129"; 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">4.2.5 Constructing a simple electrical communication system</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-v214aCH47504/RLOID=knet-v214aRLO47543/RIOID=knet-v214aRIO121146/knet/v214aVID4799/4_2_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-v214aCH47504/RLOID=knet-v214aRLO47543/RIOID=knet-v214aRIO121146/knet/v214aVID4799/4_2_5.swf"> </embed> </object>Instructor Note<p class="smtext">The purpose of this target indicator, a lab activity, is three-fold: to consolidate students knowledge of conducting paths, circuits, and Cat 5 media; to raise issues that any data communications system will face; and to have fun while learning.</p><p class="smtext">First, students will have been using electrical vocabulary, developing their multimeter skills, and getting familiar with CAT 5 UTP. This lab requires them to build several series circuits using the Cat 5 medium.</p><p class="smtext">Secondly, the students will run into issues from all 7 layers. They must decide what ideas, or range of ideas, they want to communicate and what "network" services are required (Layer 7). They must decide on a form of data representation, for example ASCII or Morse code (Layer 6). They must decide on how to open and close sessions (layer 5). They must decide upon a window size and whether data will be delivered reliably (with acknowledgments and retransmissions) or unreliably. Since this is a point to point link, they need not worry about Layer 3 addressing, but if they had multiple stations then they might consider address information. They definitely have to decide upon a frame format (Layer 2) and of course decide the signal and media specifications (Layer 1), which will govern their communications link. Feel free to adapt the basic lab ideas to your students needs and interests.</p><p class="smtext">The lab activity requires approximately 50 minutes. This TI relates to CCNA Certification Exam Objective #51.</p><p class="smtext">The diagram shows part of the circuits that allow Ethernet NICs to communicate with each other. This will help with the challenge of this lab, which is to design, build, and demonstrate a simple electrical communication system.</p><a href="#" onClick="javascript:launchReference('knet-v214aRIO125215', 'null', 'null');void(null);">Lab Activity</a><p class="smtext">In this lab, you will design, build, and test a simple, complete, fast, and reliable communication system using common materials.</p></td> </tr> </table> </td> </tr> </table> </body></html>⌨️ 快捷键说明
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