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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-v214aCH47503'; 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-v214aCH47503"; nbparams = "CHAPID="+chapterID+"/RLOID="+"knet-v214aRLO47537"+"/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-v214aCH47503"; nbparams = "CHAPID="+chapterID+"/RLOID="+"knet-v214aRLO47539"+"/RIOID="+"knet-v214aRIO120898"; 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">3.4.2 Lab: Building a simple network</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-v214aCH47503/RLOID=knet-v214aRLO47537/RIOID=knet-v214aRIO121125/knet/v214aVID4815/3_4_2.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-v214aCH47503/RLOID=knet-v214aRLO47537/RIOID=knet-v214aRIO121125/knet/v214aVID4815/3_4_2.swf"> </embed> </object>Instructor Note<p class="smtext">The purpose of this target indicator is to have the students start building networks with the simplest possible network, one PC to another. it is important that student build their understanding of complex networks from the ground up. While this may seem trivial, in this small network many of the issues that arise are the same when building larger networks. First, both machines must have their Layer 1 connectivity using a special kind of cable, a crossover cable. This cable attaches the transmit wire from one PCs NIC to the other NIC and vice versa. This raises Layer 1 as an issue. Secondly, both PCs must have properly installed NICs, a Layer 2 issue. And both machines must be on the same subnet, a Layer 3 issue. For students who have never built a network, this is a good one to start with. The lab continues by having the students to take the next logical step, a slightly more complex network. The network represents a small workgroup, which should be explained to the students. The students will need to use straight-through patch cables to connect to the hub, which will contrast with their previous use of cross-connect. Emphasize to student the importance of Layer 1 wiring standards.</p><p class="smtext">The lab concludes by having the students build a slightly more complex and realistic network, a small workgroup with Internet connectivity. The importance of having the students build some simple LANs early in the course cannot be overstated. It sets the stage for most of the learning that follows. Regardless of your resource and time constraints, do not skip these lab activities.</p><p class="smtext">The lab activity requires approximately 60 minutes. It is extremely important for helping students solidify their understanding of concepts already presented, and for creating a base for future learning to occur.</p><a href="#" onClick="javascript:launchReference('knet-v214aRIO125210', 'null', 'null');void(null);">Lab Activity</a><p class="smtext">In this lab you will build a very simple network. It will present many of the same issues that you would encounter if you were to build a larger network, or even a whole Internet.</p><p class="smtext">The purpose of this lab is to build a simple work group. You will first connect two PCs as shown in the Figure <img border="0" src="../../../../../CHAPID=knet-v214aCH47503/RLOID=knet-v214aRLO47537/RIOID=knet-v214aRIO121125/knet/v214adataimage1/1.gif" width="12" height="12">. Then, as shown in Figure <img border="0" src="../../../../../CHAPID=knet-v214aCH47503/RLOID=knet-v214aRLO47537/RIOID=knet-v214aRIO121125/knet/v214adataimage2/2.gif" width="12" height="12"> you connect four hosts to a hub, which will provide connectivity between four hosts. Lastly, you will configure the hosts with approved IP addresses, and a Layer 1 connection to the school's network cloud (which is connected to the district's ISP). Your lab will be complete when you connect the hosts to the Internet as shown in Figure <img border="0" src="../../../../../CHAPID=knet-v214aCH47503/RLOID=knet-v214aRLO47537/RIOID=knet-v214aRIO121125/knet/v214adataimage3/3.gif" width="12" height="12">.</p>Web Links<a target="_blank" href="http://www.rad.com/networks/1997/nettut/hub.html"><span class="smtext">Hubs</span></a></td> </tr> </table> </td> </tr> </table> </body></html>⌨️ 快捷键说明
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