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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-v214aCH47510'; 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-v214aCH47510"; nbparams = "CHAPID="+chapterID+"/RLOID="+"knet-v214aRLO47817"+"/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-v214aCH47510"; nbparams = "CHAPID="+chapterID+"/RLOID="+"knet-v214aRLO47821"+"/RIOID="+"knet-v214aRIO123683"; 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">10.6.6 Performing the AND function</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-v214aCH47510/RLOID=knet-v214aRLO47817/RIOID=knet-v214aRIO123674/knet/v214aVID4941/10_6_6.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-v214aCH47510/RLOID=knet-v214aRLO47817/RIOID=knet-v214aRIO123674/knet/v214aVID4941/10_6_6.swf"> </embed> </object>Instructor Note<p class="smtext">There are two keys to getting these types of problems correct. First, the student must be able to perform decimal to binary conversions. Secondly, they must understand the AND operation. Neatness is encouraged (lining up the bits and performing the bit-wise AND). Tricks are encouraged, like the idea that when AND is involved, any mask bits with a 1 copy the network ID bits and any mask bits with a 0 result in a zero in the answer.</p><p class="smtext">The "lab", a paper-based activity, requires approximately 45 minutes. This TI is related to CCNA Certification Exam Objectives #29, #30, and #36.</p><p class="smtext">The lowest numbered address in an IP network is the network address (the network number plus 0s (zeros) in the entire host field). This also applies to a subnet, wherein the lowest numbered address is the address of the subnet (the network address plus the subnet field plus 0s (zeros) in the remaining host field).</p><a href="#" onClick="javascript:launchReference('knet-v214aRIO125374', 'null', 'null');void(null);">Lab Activity</a><p class="smtext">In this lab, you will learn the basics of IP subnet masks and their use with TCP/IP networks.</p><p class="smtext">In order to route a data packet, the router must first determine the destination network or subnet address by performing a logical AND using the destination host IP address and the subnet mask. The result will be the network or subnet address.</p><p class="smtext">In the figure, the router has received a packet for host 131.108.2.2. It uses the AND operation to learn that this packet should be routed to subnet 131.108.2.0. The process of ANDing is explained in Lab 10.6.6. </p></td> </tr> </table> </td> </tr> </table> </body></html>⌨️ 快捷键说明
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