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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-v214aRLO47818"+"/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%"><img border="0" src="../../../../../images/ccna/common/icon4.gif"></td> </tr> </table> <p> </p> </td><td bgcolor="#FFFFFF" valign="top"> <p align="left"> <span class="resourceTitle">Lab 10.7.7 Subnet Mask</span> </p><p class="smtext">Estimated time: 45 min.</p><p align="left"> <span class="resourceSectionTitle">Objectives: </span> </p> <blockquote> <p class="smtext">This lab will focus on your ability to accomplish the following tasks:</p> <span class="smtext"> <ul type="disc"><li>Work with a more complex Class C subnet scenario</li><li>Determine the subnets available with a particular IP network address and subnet mask</li><li>Given a network address and requirements, be able to determine how many subnets and hosts</li><li>Be able to determine what subnet mask should be used to give the appropriate number of hosts and subnets</li><li>Assign IP addresses and subnet masks to hosts and router interfaces</li><li>Use the "ANDing" process to move an IP packet from a local host to a remote host through a router</li></ul> </span> </blockquote><p align="left"> <span class="resourceSectionTitle">Background: </span> </p> <blockquote> <p class="smtext">This lab will build on Lab Subnet Mask 1 and help develop a better understanding of IP subnet masks using a real-world example with additional worksheet exercises based on foundations established in the prior lab. This lab will focus on a Class C network with three subnets and using a Custom Subnet Mask.</p> </blockquote><p align="left"> <span class="resourceSectionTitle">Tools / Preparation:</span> </p> <blockquote> <p class="smtext">This is primarily a written lab exercise but you will want to use Control Panel / Network to review some real network IP addresses and the basics covered in the prior lab. The following resources will be required:</p> <span class="smtext"> <ul type="disc"><li>PC workstation with Windows operating system (Win 95, 98, NT, or 2000) installed on the PC and access to the Windows Calculator.</li></ul> </span> </blockquote><p align="left"> <span class="resourceSectionTitle">Notes:</span> </p> <blockquote> <p class="smtext"> <img border="0" src="../../../../../CHAPID=knet-v214aCH47510/RLOID=knet-v214aRLO47818/RIOID=knet-v214aRIO125376/knet/v214aclixsi144/line450.gif" width="450" height="1"></p> <p class="smtext"> <img border="0" src="../../../../../CHAPID=knet-v214aCH47510/RLOID=knet-v214aRLO47818/RIOID=knet-v214aRIO125376/knet/v214aclixsi144/line450.gif" width="450" height="1"></p> <p class="smtext"> <img border="0" src="../../../../../CHAPID=knet-v214aCH47510/RLOID=knet-v214aRLO47818/RIOID=knet-v214aRIO125376/knet/v214aclixsi144/line450.gif" width="450" height="1"></p> </blockquote><p align="left"> <span class="resourceSectionTitle"><span class="resourceRed">Step 1 - IP Address Basics</span></span> </p> <blockquote> <p class="smtext"> <b>Explanation:</b> For reference, the IP addressing table from the prior lab is included here. IP network addresses are assigned by the Internet Network Information Center (InterNIC). You will work with a Class C.</p> <table border="1" cellpadding="2" cellspacing="0" width="85%" bordercolor="#000000"><tr><td class="smtext" align="center" colspan="1" rowspan="1" valign="top"><b>Cls</b></td><td class="smtext" align="center" colspan="1" rowspan="1" valign="top"><b>1<sup>st</sup> Octet Decimal Range</b></td><td class="smtext" align="center" colspan="1" rowspan="1" valign="top"><b>1<sup>st</sup> Octet High Order Bits</b></td><td class="smtext" align="center" colspan="1" rowspan="1" valign="top"><b>Network / Host ID (N=Network, H=Host)</b></td>⌨️ 快捷键说明
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