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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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This is a good time to instruct the students about proper anti-static precautions -- grounding themselves and holding the printed circuit board NIC by the edges -- while passing some NICs around. Whenever possible, try and give the students something tangible when you are discussing it or when they are reading about it in the curriculum.</p> <p>This TI relates to CCNA Certification Exam Objectives #3 and #60.</p> </span></td> </tr> </table> </td> </tr> </table> </td> </tr> </table><p>As shown in the figure, a network interface card (NIC) is a printed circuit board that provides network communication capabilities to and from a personal computer. Also called a LAN adapter, it plugs into a motherboard and provides a port for connecting to the network. This card can be designed as an Ethernet card, a Token Ring card, or a Fiber Distributed Data Interface (FDDI) card. </p><p>A network interface card communicates with the network through a serial connection, and with the computer through a parallel connection. Each card requires an interrupt request (IRQ), an input/output (I/O) address, and device driver software to work with DOS or Windows. An IRQ, or interrupt request line, is a signal informing a CPU that an event that needs its attention has occurred. An IRQ is sent over a hardware line from the interface to the microprocessor. The microprocessor then stops its current activity, services the interface, and returns to resume its normal activity right where it left off. An example of an interrupt being issued would be when a key is pressed on a keyboard; the CPU must move the character from the keyboard to RAM. An I/O address is a location in I/O address space that is used to uniquely select the auxiliary device and communicate with it. In DOS-based systems, upper memory refers to the memory area between the first 640 kilobytes (KB) and 1 megabyte (MB) of RAM.</p><p>When you select a network interface card, consider the following three factors:</p><ol><li>The type of network (for example, Ethernet, Token Ring, or FDDI)</li><li>The type of media (for example, twisted pair, coaxial, or fiber-optic cable)</li><li>The type of system bus (for example, PCI or ISA)</li></ol></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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