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<html> <head> <meta content="en-us" http-equiv="Content-Language"> <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"> window.scrollTo(0,0); function newPage(pageID) { alert("COMMING SOON!!\nThis feature is currently in development."); } function launchMoreInfo(oid) { dash = oid.indexOf('-'); sub1 = oid.substring(0,dash); sub2 = oid.substring(dash+1); // this is an URL base on the // system that generated the static // download of the curriculum. httpref = "http://nomar.sdf.cisco.com/servlet/org.cli.delivery.rendering.servlet.MIServlet/Static=true,LMSID=DTUI,Engine=dynamic,Theme=cnamstheme,Style=ccna,Language=en,Version=2,RootID=knet-v214aCV47051/CHAPID=null/RLOID=null/RIOID=null/"; newref = httpref + sub1 +"/"+ sub2 +"/moreinfoframeset.html"; //alert("new newref :\n" + newref); window.open(newref,'MoreInfo','toolbar=no,status=yes,menubar=no,location=no,scrollbars=yes,height=442,width=756,left=20,top=20,resizable=yes') } function launchContentResource(contentID) { top.currentSupport = 0; 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eval('top.frames.main_frame.location.href="'+ContentRef+'referencecontroller_crf.html"'); chapter = "knet-v214aCH47509"; ch_dash = chapter.indexOf('-'); ch_sub1 = chapter.substring(0,ch_dash); ch_sub2 = chapter.substring(ch_dash+1); params = "CHAPID=" + chapter + "/RLOID=" + "knet-v214aRLO47806" + "/RIOID=" + "knet-v214aRIO123580"; returnRef = "../../../../../"+ params + "/"+ ch_sub1 +"/"+ ch_sub2 +"/pageframeset.html"; top.prevPage = returnRef; } function launchFile(filepath) { newWindow = window.open(filepath,"","top=70,left=120,width="+(screen.width*.50)+",height="+(screen.height*.50)+",resizable=yes,scrollbars=yes,toolbar=yes,menubar=yes,status=yes"); /* if (is.ie && filepath.lastIndexOf(".pdf") != -1) { pageTimer = setInterval("winLoadCheck()", 1000); } */ } function winLoadCheck() { if (newWindow.document.readyState == 'complete') { clearInterval(pageTimer); newWindow.location.reload(); } } // BrowserCheck Object // provides most commonly needed browser checking variables // 19990326 // Copyright (C) 1999 Dan Steinman // Distributed under the terms of the GNU Library General Public License // Available at http://www.dansteinman.com/dynapi/ function BrowserCheck() { var b = navigator.appName if (b=="Netscape") this.b = "ns" else if (b=="Microsoft Internet Explorer") this.b = "ie" else this.b = b this.v = parseInt(navigator.appVersion) this.ns = (this.b=="ns" && this.v>=4) this.ns4 = (this.b=="ns" && this.v==4) this.ns5 = (this.b=="ns" && this.v==5) this.ie = (this.b=="ie" && this.v>=4) this.ie4 = (navigator.userAgent.indexOf('MSIE 4')>0) this.ie5 = (navigator.appVersion.indexOf('MSIE 5.0')>0) this.ie55 = (navigator.appVersion.indexOf('MSIE 5.5')>0) if (this.ie5) this.v = 5 this.min = (this.ns||this.ie) } // automatically create the "is" object is = new BrowserCheck()</script> </head> <body onLoad="window.focus();" alink="#000000" vlink="#000000" link="#000000" bgcolor="#E7E7E7" background="../../../../../images/ccna/common/bg.gif"> <table width="100%" cellspacing="0" cellpadding="2" border="0"><tr> <td bgcolor="#000000"><img height="1" width="2" border="0" src="../../../../../images/ccna/common/transdot.gif"></td><td class="rlohdr"><img height="1" width="2" border="0" src="../../../../../images/ccna/common/transdot.gif"></td><td valign="top" class="rlohdr">9.7</td><td width="100%" class="rlohdr"> <table width="90%" cellpadding="0" cellspacing="0" border="0"> <tr> <td class="rlohdr">Range of Equipment for Testing Structured Cabling Projects</td> </tr> </table> </td> </tr> <tr> <td bgcolor="#000000"><img height="1" width="2" border="0" src="../../../../../images/ccna/common/transdot.gif"></td><td class="riohdr"><img height="1" width="2" border="0" src="../../../../../images/ccna/common/transdot.gif"></td><td valign="top" class="riohdr">9.7.2</td><td width="100%" class="riohdr"> <table width="90%" cellpadding="0" cellspacing="0" border="0"> <tr> <td class="riohdr">Network operation testing</td> </tr> </table> </td> </tr> <tr> <td colspan="4"> <table width="90%" cellspacing="0" cellpadding="0" border="0"> <tr> <td class="smtext"> <p> </p><table cellpadding="0" cellspacing="0" width="100%" border="0" xmlns:java="http://xml.apache.org/xslt/java"> <tr> <td width="100%"><img height="10" width="1" border="0" src="../../../../../images/ccna/common/transdot.gif"></td> </tr> <tr> <td width="100%"> <table bgcolor="#000000" bordercolor="#000000" cellspacing="0" bordercolorlight="#000000" width="100%" border="0"> <tr> <td width="100%"> <table bgcolor="#FFFFFF" cellspacing="0" cellpadding="2" width="100%" border="0"> <tr> <td valign="middle"><img height="22" width="22" border="0" src="../../../../../images/ccna/common/inotes.gif"></td><td valign="middle"><span class="cstitle">Instructor Note</span></td> </tr> <tr> <td valign="top"> </td><td valign="top"><span class="cstext"> <p>The importance of a baseline measurement of network performance is introduced. The baseline is the set of data about your network that you check periodically to ensure the network is still functioning properly.</p> <p>An outstanding, brand-new, all-purpose tool from Fluke is shown in the figure. Undoubtedly other vendors will be following suit. The idea is to have a "Swiss Army Knife" for a wide range of basic network tests. Emphasize to students the utility and versatility of a very portable device for doing basic network troubleshooting at layers 1, 2 and 3. This tool is available to Academies, in various quantities and at a discount, on the Academy Store. It will also be available for purchase by students as well. Upcoming lab activities will be written to teach the wide range of uses for this tool.</p> </span></td> </tr> </table> </td> </tr> </table> </td> </tr> </table><p>The IEEE and the TIA/EIA have established standards that allow testing of the network to see if it is operating at an acceptable level. If the network passes this test and is certified as meeting the standards, this measurement can be used as an established baseline. The baseline is a record of the starting point of the network or newly installed performance capabilities.</p><p>Knowing the baseline measurement is important. Testing does not end just because the network installation is certified as meeting the standards. The network should be tested on a regular basis in order to ensure that it performs at its peak. This can be done by comparing current measurements with recorded measurements that were taken when the system was known to be operating properly. If there is a significant change from the baseline measurement, it is an indication that there is something wrong with the network. Repeated testing of the network, and comparisons against its baseline, will help spot specific network problems that may be caused by aging, poor maintenance practices, weather, or other factors.</p><p>One example of an all-purpose tool for testing the baseline health of a network is shown in the figure. The Fluke Network NetTool (or other equivalent all-purpose handheld testers) provides vision into the cause of desktop-to-network connectivity problems. It combines the capabilities of a network tester, a PC configuration tester, and a basic cable tester. NetTool (or equivalent) connects between the PC and the wall jack. Once connected, the NetTool listens, collects, and organizes information regarding the following:</p><ol><li>The network resources available</li><li>The network resources the PC is configured to use</li><li>The health of the network segment including errors, collisions, and utilization, as well as the health of the PC NIC and the local network</li></ol><p>You can also use NetTool (or equivalent) to perform basic cable tests to detect opens, shorts, and split pairs. The length to the open on any RJ45-terminated cable can also be tested, as well as pin-to-pin wiremap tests on installed wiring or patch cables.</p><p>Summary of NetTool's (or equivalent) Capabilities:</p><ol><li>Service Identification identifies a jack as Ethernet, Token Ring, Telco, or inactive.</li><li>Link Reporting discovers and reports the previously unseen PC-hub/switch link negotiation.</li><li>Inline Mode concisely displays the IP address of the PC and the network resources used. These can include the default router, email server, DNS, and web servers accessed.</li><li>Basic Cable Testing performs basic cable tests, showing opens, shorts, split pairs, length, and pin-to-pin wire mapping.</li></ol><table cellpadding="0" cellspacing="4" width="63%" border="0" xmlns:java="http://xml.apache.org/xslt/java"> <tr> <td valign="middle" width="8%"><img height="23" width="23" src="../../../../../images/ccna/common/icon2.gif"></td><td valign="middle" width="92%"><span class="cstitle">Web Links</span></td> </tr> <tr> <td valign="middle" width="8%"> </td><td valign="middle" width="92%"><span class="smtext"><a target="_blank" href="http://www.siemon.com/glossary/definitions.html">Cabling Glossary</a></span></td> </tr> <tr> <td valign="middle" width="8%"> </td><td valign="middle" width="92%"><span class="smtext"><a target="_blank" href="http://www.fluke.com/nettools">Network Test Equipment</a></span></td> </tr> </table></td> </tr> </table> </td> </tr></table> <p> </p> <table width="100%" cellspacing="0" cellpadding="2" border="0" valign="bottom"> <tr> <td></td> </tr> </table> </body></html>⌨️ 快捷键说明
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