an introduction to ldap（1）.htm

软考英语精典短文每日一练汇总 软考英语精典短文每日一练汇总

      <DIV id=cont_right style="WIDTH: 495px"><BR><BR>If you work in the 
      computing industry, the chances are good that you've heard of LDAP by now. 
      Wondering what all the excitement is about? Want to know a little more 
      about the underlying technology? You've come to the right place. This 
      introduction - the first in a series of articles describing how to design, 
      implement, and integrate an LDAP environment at your company - will 
      familiarize you with the concepts behind LDAP while leaving the really 
      hardcore details for later. Here, we'll touch on the following topics: 
      <BR><BR>What is LDAP, anyway? <BR><BR>When should you use LDAP to store 
      your data? <BR><BR>The structure of an LDAP directory tree 
      <BR><BR>Individual LDAP records <BR><BR>Customizing your directory's 
      object classes <BR><BR>An example of an individual LDAP entry <BR><BR>LDAP 
      replication <BR><BR>Security and access control <BR><BR>To start with, 
      what's happening with LDAP today is exciting. A company-wide LDAP 
      implementation can enable almost any application, running on almost any 
      computer platform, to obtain information from your LDAP directory. And 
      that directory can be used to store a broad range of data: email address 
      and mail routing information, HR data, public security keys, contact 
      lists, and much more. By making an LDAP directory a focal point in your 
      systems integration, you're providing one-stop shopping whenever people go 
      looking for information within your company - even if the primary source 
      of the data lives elsewhere. <BR><BR>But wait, you say. You're already 
      using an Oracle, Sybase, Informix, or Microsoft SQL database to store much 
      of that same data. How is LDAP different? What makes it better? Read on. 
      <BR><BR>What is LDAP, anyway? <BR><BR>The Lightweight Directory Access 
      Protocol, better known as LDAP, is based on the X.500 standard, but 
      significantly simpler and more readily adapted to meet custom needs. 
      Unlike X.500, LDAP supports TCP/IP, which is necessary for Internet 
      access. The core LDAP specifications are all defined in RFCs -- a complete 
      list of LDAP-related RFCs may be found at the LDAPman RFC page. 
      <BR><BR>Using "LDAP" in a sentence <BR><BR>In everyday conversation, 
      you'll hear well-intentioned people say things like, "Should we be storing 
      that in LDAP?" or "Just get that data from the LDAP database," or "How do 
      we go about tying LDAP into an RDB?" Strictly speaking, though, LDAP isn't 
      a database at all, but a protocol used to access information stored in an 
      information directory (also known as an LDAP directory). A more precise 
      formulation might look something like this: "Using LDAP, data will be 
      retrieved from (or stored in) the correct location within our information 
      directory." But you won't find me correcting anyone on this point: either 
      way, you get the idea across, and that's what counts. 
      <BR><BR>　如果你在计算机行业工作，那么对LDAP可能早有耳闻了。想深入地了解LDAP吗？那么可以好好地读一下这篇文章。这篇介绍性的文章是一系列介绍如何在企业中设计、实现和集成LDAP环境的文章的头一篇。主要是先让你熟悉一下LDAP的基本概念，那些比较困难的细节问题将放到以后讨论。在这篇文章中我们将要介绍：<BR><BR>　　1.什么是LDAP?<BR><BR>　　2.什么时候该用LDAP存储数据？<BR><BR>　　3.LDAP目录树的结构<BR><BR>　　4.单独的LDAP记录<BR><BR>　　5.作为例子的一个单独的数据项<BR><BR>　　6.LDAP复制<BR><BR>　　7.安全和访问控制<BR><BR>　　现在LDAP技术不仅发展得很快而且也是激动人心的。在企业范围内实现LDAP可以让运行在几乎所有计算机平台上的所有的应用程序从LDAP目录中获取信息。LDAP目录中可以存储各种类型的数据：电子邮件地址、邮件路由信息、人力资源数据、公用密匙、联系人列表，等等。通过把LDAP目录作为系统集成中的一个重要环节，可以简化员工在企业内部查询信息的步骤，甚至连主要的数据源都可以放在任何地方。如果Oracle、Sybase、Informix或Microsoft 
      SQL数据库中已经存储了类似的数据，那么LDAP和这些数据库到底有什么不同呢？是什么让它更具优势？请继续读下去吧！<BR><BR>　　1.什么是LDAP?<BR><BR>　　LDAP的英文全称是Lightweight 
      Directory Access 
      Protocol，一般都简称为LDAP。它是基于X.500标准的，但是简单多了并且可以根据需要定制。与X.500不同，LDAP支持TCP/IP，这对访问Internet是必须的。LDAP的核心规范在RFC中都有定义，所有与LDAP相关的RFC都可以在LDAPman 
      RFC网页中找到。<BR><BR>　　怎么使用LDAP这个术语呢？<BR><BR>　　在日常交谈中，你可能会听到有些人这么说："我们要把那些东西存在LDAP中吗？"，或者"从LDAP数据库中取出那些数据！"，又或者"我们怎么把LDAP和关系型数据库集成在一起？"。严格地说，LDAP根本不是数据库而是用来访问存储在信息目录（也就是LDAP目录）中的信息的协议。更为确切和正式的说法应该是象这样的："通过使用LDAP，可以在信息目录的正确位置读取（或存储）数据"。但是，也没有必要吹毛求疵，尽管表达得不够准确，我们也都知道对方在说什么。<BR><BR><BR><BR></DIV></TD></TR></TBODY></TABLE>
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