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<html><head><meta http-equiv="Content-Type" content="text/html; charset=windows-1252"><meta name="GENERATOR" content="Microsoft FrontPage 4.0"><meta name="ProgId" content="FrontPage.Editor.Document"><title>New Page 3</title><base target="_self"></head><body background="../../images/bgindex.gif" bgcolor="#F7DB7B" leftmargin=20 topmargin=10 marginwidth="20" marginheight="10"> <table border="0" width="420" cellspacing="0" cellpadding="2"> <tbody> <tr> <td> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>label swapping</b><br> </font> <dl> <dd><font face="Arial" size="2">Routing algorithm used by APPN in which each router that a message passes through on its way to its destination independently determines the best path to the next router.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF40960"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LAN</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Local-area network</strong>. High-speed, low-error data network covering a relatively small geographic area (up to a few thousand meters). LANs connect workstations, peripherals, terminals, and other devices in a single building or other geographically limited area. LAN standards specify cabling and signaling at the physical and data link layers of the OSI model. Ethernet, FDDI, and Token Ring are widely used LAN technologies. Compare with <a href="m.html#REF26963"><i>MAN</i></a> and <a href="w.html#REF17966"><i>WAN</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF23533"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LANE</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>LAN emulation</strong>. Technology that allows an ATM network to function as a LAN backbone. The ATM network must provide multicast and broadcast support, address mapping (MAC-to-ATM), SVC management, and a usable packet format. LANE also defines Ethernet and Token Ring ELANs. See also <a href="e.html#REF14842"><i>ELAN</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LAN emulation</b><br> </font> <dl> <dd><font face="Arial" size="2">See <a href="l.html#REF23533"><i>LANE</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LAN Emulation Client</b><br> </font> <dl> <dd><font face="Arial" size="2">See <a href="l.html#REF38895"><i>LEC</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LAN Emulation Configuration Server</b><br> </font> <dl> <dd><font face="Arial" size="2">See <a href="l.html#REF18787"><i>LECS</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LAN Emulation Server</b><br> </font> <dl> <dd><font face="Arial" size="2">See <a href="l.html#REF30215"><i>LES</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF20490"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LAN Extender</b></a><br> </font> <dl> <dd><font face="Arial" size="2">Any of the products in the Cisco 1000 series. Cisco LAN Extenders provide a transparent connection between a central site and a remote site, logically extending the central network to include the remote LAN. LAN Extender products support all standard network protocols and are configured and managed through a host router at the central site, requiring no technical expertise at the remote end. See also <a href="c.html#REF17692"><i>Cisco 1000</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LAN Manager</b><br> </font> <dl> <dd><font face="Arial" size="2">Distributed NOS, developed by Microsoft, that supports a variety of protocols and platforms.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LAN Manager for UNIX</b><br> </font> <dl> <dd><font face="Arial" size="2">See <a href="l.html#REF40942"><i>LM/X</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LAN Network Manager</b><br> </font> <dl> <dd><font face="Arial" size="2">See <a href="l.html#REF10388"><i>LNM</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LAN Server</b><br> </font> <dl> <dd><font face="Arial" size="2">Server-based NOS developed by IBM and derived from LNM. See also <a href="l.html#REF10388"><i>LNM</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF35659"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LAN switch</b></a><br> </font> <dl> <dd><font face="Arial" size="2">High-speed switch that forwards packets between data-link segments. Most LAN switches forward traffic based on MAC addresses. This variety of LAN switch is sometimes called a <i>frame switch</i>. LAN switches are often categorized according to the method they use to forward traffic: cut-through packet switching or store-and-forward packet switching. Multilayer switches are an intelligent subset of LAN switches. An example of a LAN switch is the Cisco Catalyst 5000. Compare with <a href="m.html#REF27650"><i>multilayer switch</i></a>. See also <a href="c.html#REF27078"><i>cut-through packet switching</i></a> and <a href="s.html#REF33243"><i>store and forward packet switching</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF12763"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LAPB</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Link Access Procedure, Balanced</strong>. Data link layer protocol in the X.25 protocol stack. LAPB is a bit-oriented protocol derived from HDLC. See also <a href="h.html#REF37169"><i>HDLC</i></a> and <a href="x.html#REF32170"><i>X.25</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF33501"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LAPD</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Link Access Procedure on the D channel</strong>. ISDN data link layer protocol for the D channel. LAPD was derived from the LAPB protocol and is designed primarily to satisfy the signaling requirements of ISDN basic access. Defined by ITU-T Recommendations Q.920 and Q.921.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF31268"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LAPM</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Link Access Procedure for Modems</strong>. ARQ used by modems implementing the V.42 protocol for error correction. See also <a href="a.html#REF13661"><i>ARQ</i></a> and <a href="v.html#REF16814"><i>V.42</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF23271"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>laser</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Light amplification by stimulated emission of radiation</strong>. Analog transmission device in which a suitable active material is excited by an external stimulus to produce a narrow beam of coherent light that can be modulated into pulses to carry data. Networks based on laser technology are sometimes run over SONET.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF15172"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LAT</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Local-area transport</strong>. A network virtual terminal protocol developed by Digital Equipment Corporation.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF13994"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LATA</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Local access and transport area</strong>. Geographic telephone dialing area serviced by a single local telephone company. Calls within LATAs are called "local calls." There are well over 100 LATAs in the United States.<br> </font></dd> </dl> <p><font face="Arial" size="2"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>latency</b><br> </font> <dl> <dd><font face="Arial" size="2">1. Delay between the time a device requests access to a network and the time it is granted permission to transmit.<br> 2. Delay between the time when a device receives a frame and the time that frame is forwarded out the destination port.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF27758"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LCC</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Line card control</strong>. Process that runs on the NP for each CLC, LSC, and MSC of a LightStream 2020 ATM switch. LCC establishes VCCs, maintains the link management protocol for the line card, continually monitors line quality on each trunk using TUD, and performs other functions. See also <a href="e.html#REF28784"><i>ECC</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF22911"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LCI</b></a><br> </font> <dl> <dd><font face="Arial" size="2"><strong>Logical channel identifier</strong>. See <a href="v.html#REF19756"><i>VCN</i></a>.<br> </font></dd> </dl> <p><font face="Arial" size="2"><a name="REF32344"><img border="0" src="../../images/bullet.gif" width="17" height="12"><b>LCN</b></a><br>⌨️ 快捷键说明
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