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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%"><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 10.6.6 Subnet Mask 1</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 Class C subnet masks and your ability to accomplish the following tasks:</p> <span class="smtext"> <ul type="disc"><li>Cite some reasons why a subnet mask would be needed</li><li>Distinguish between a Default Subnet Mask and a Custom Subnet Mask</li><li>Determine the subnets available with a particular IP network address and subnet mask</li><li>Given a network address and requirements for how many subnets and hosts, be able to determine what subnet mask should be used</li><li>Given a network address and a subnet mask, be able to determine the number of subnets and host per subnet that can be created as well as useable subnets and useable number of hosts</li><li>Use the "ANDing" process to determine if a destination IP address is Local or Remote</li><li>Identify valid and invalid IP host address based on a given a Network number and subnet mask</li></ul> </span> </blockquote><p align="left"> <span class="resourceSectionTitle">Background: </span> </p> <blockquote> <p class="smtext">This lab will help you understand the basics of IP subnet masks and their use with TCP/IP networks. The subnet mask can be used to split up an existing network into "subnetworks" or "subnets". This may be done to 1) reduce the size of the broadcast domains (create smaller networks with less traffic), 2) to allow LANs in different geographical locations to communicate or 3) for security reasons to separate one LAN from another. Routers separate subnets and the router determines when a packet can go from one subnet to another. Each router a packet goes through is considered a "hop". Subnet masks help workstations, servers and routers in an IP network determine if the destination host for the packet they the want to send is on their own network or another network. Default subnet masks were discussed in a prior lab. This Lab will review the Default Subnet Mask and then focus on Custom Subnet Masks which will use more bits than the default subnet mask by "borrowing" these bits from the host portion of the IP address. This creates a three-part address; 1) The original network address assigned, 2) The subnet address made up of the bits borrowed and 3) the host address made up of the bits left after borrowing some for subnets.</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 may want to use Control Panel / Network to review some real network IP addresses. 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>⌨️ 快捷键说明
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