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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-v214aCH47501'; 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-v214aCH47501"; nbparams = "CHAPID="+chapterID+"/RLOID="+"knet-v214aRLO47518"+"/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-v214aCH47501"; nbparams = "CHAPID="+chapterID+"/RLOID="+"knet-v214aRLO47524"+"/RIOID="+"knet-v214aRIO120878"; 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">1.1.1 Major components of a PC</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-v214aCH47501/RLOID=knet-v214aRLO47518/RIOID=knet-v214aRIO120852/knet/v214aVID4996/1_1_1.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-v214aCH47501/RLOID=knet-v214aRLO47518/RIOID=knet-v214aRIO120852/knet/v214aVID4996/1_1_1.swf"> </embed> </object>Instructor Note<p class="smtext">This target indicator serves two purposes.</p><p class="smtext">First, it is important to help the students appreciate how they are going to be viewing the curriculum -- via a computer. Since no prerequisites are required for the CCNA program, and due to the wide variety of prior knowledge of computers of students entering the program, a small amount of time should be spent bringing all students up to a basic knowledge of computer hardware.</p><p class="smtext">Second, the idealized (simplified) computer, with CPU, memory, and interfaces all communicating via a bus, can be thought of as a simple network, foreshadowing the networks to come.</p><p class="smtext">The lab activity is designed to make students more aware of the machine on which they will be studying the curriculum. It is hoped that students can start to perform basic troubleshooting of their own workstation.</p><p class="smtext">For students with little or no hands-on experience, doing a mechanical and electrical dissection of a PC -- taking an old PC apart and learning a bit about the hardware components -- can be an empowering revelation. The Engineering Journal should be introduced as a place to note technical information. Have the students leave the first few pages blank (to create a table of contents later). For every lab during the semester, the student should make notes about the lab and their reflections on the lab in the journal.</p><p class="smtext">For students with prior PC hardware courses or A+ certification, this lab could be skipped or summarized.</p><p class="smtext">The lab activity requires approximately 60 minutes. This TI relates to CCNA Certification Exam Objective #19.</p><p class="smtext">Because computers are important building blocks in a network, it is important to be able to recognize and name the major components of a PC.</p><a href="#" onClick="javascript:launchReference('knet-v214aRIO125201', 'null', 'null');void(null);">Lab Activity</a><p class="smtext">In this lab, you become familiar with the basic external peripheral components of a PC computer system and their connections including network attachment.</p><p class="smtext">Many networking devices are themselves special-purpose computers, with many of the same parts as "normal" PCs. In order to use your computer as a reliable means of obtaining information, such as accessing web-based curriculum, your computer must be in good working order. You may occasionally need to troubleshoot simple problems in your computer hardware and software. You should be able to recognize, name, and state the purpose of the following PC components:</p><p class="smtext"> <b>Small, Discrete Components</b> </p><span class="smtext"> <ul type="disc"><li>A transistor is a device that amplifies a signal or opens and closes a circuit.</li><li>An integrated circuit (IC) is a device made of semiconductor material; contains many transistors and performs a specific task.</li><li>A resistor is a device made of material which restricts the flow of electric current.</li><li>A capacitor is an electronic component that stores energy in the form of an electrostatic field; it consists of two conducting metal plates separated by an insulating material.</li><li>A connector is the part of a cable that plugs into a port or interface.</li><li>A light emitting diode (LED) is a semiconductor device which emits light when a current passes through it.</li></ul> </span><p class="smtext"> <b>Personal Computer Subsystems</b> </p><span class="smtext"> <ul type="disc"><li>A printed circuit board (pcb) - a thin insulating board on which chips (integrated circuits) and other electronic components are placed and interconnected by conducting paths.</li><li>A compact disk read only memory (CD-ROM) drive is a device that can read information from a CD-ROM. </li><li>The central processing unit (CPU) is the brains of the computer where most calculations and operations take place.</li><li>A floppy disk drive is a disk drive that can read and write to floppy disks.</li><li>The hard disk drive is the device that reads and writes data on a hard disk.</li><li>The microprocessor is an integrated circuit that contains a CPU.</li><li>The motherboard is the main printed circuit board of a microcomputer.</li><li>The bus is a collection of wires through which data is transmitted from one part of a computer to another.</li><li>Random access memory (RAM) is a device for data storage (computer memory) that can have new data written into it as well as stored data read from it. A drawback of RAM is that it requires electrical power to maintain data storage. If the computer is turned off or looses power, all data stored in RAM is lost, unless the data was saved to some other permanent storage.</li><li>Read-only memory (ROM) is computer memory on which data has been prerecorded. Once data has been written onto a ROM chip, it cannot be removed and can only be read.</li><li>The system unit is the main part of a PC. It includes the chassis, microprocessor, main memory, bus, and ports. It does not include the keyboard, monitor, or any external devices connected to the computer.</li><li>An expansion slot is a connector on a computer mother board where a circuit board can be inserted to add new capabilities to the computer.</li><li>The power supply is the component that supplies power to a computer.</li></ul> </span><p class="smtext"> <b>Backplane Components</b> </p><span class="smtext"> <ul type="disc"><li>The backplane is the large circuit board that contains sockets for expansion cards.</li><li>A network card is an expansion board inserted into a computer so that the computer can be connected to a network.</li><li>A video card is a board that plugs into a PC to give it display capabilities.</li><li>A sound card is an expansion board that enables a computer to manipulate and output sounds.</li><li>A parallel port is an interface that is capable of transferring more than one bit simultaneously. It is used to connect external devices such as printers.</li><li>A serial port is an interface that can be used for serial communication, in which only one bit is transmitted at a time.</li><li>A mouse port is a port designed for connecting a mouse to a PC.</li><li>A power cord is a cord used to connect an electrical device to an electrical outlet in order to provide power to the device.</li></ul> </span><p class="smtext">The figure shows the basic components of an idealized computer. You can think of the internal components of a PC as a network of devices, all attached to the system <i>bus</i>. In a sense, a PC is a small computer network.</p>Web Links<a target="_blank" href="http://www.techweb.com/encyclopedia"><span class="smtext">TechEncyclopedia</span></a><br><a target="_blank" href="http://members.aol.com/wbox/overview.htm"><span class="smtext">What's in Your Computer</span></a></td> </tr> </table> </td> </tr> </table> </body></html>⌨️ 快捷键说明
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