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<td width="90%"><font face="Arial" size="3"><font color="#008080"><b><img border="0" src="../../images/arrow_down.gif" width="19" height="12">Preface</b></font> <b> <font color="#CCCC00">::</font></b></font></td>
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<p align="right"><font face="Arial" size="3" color="#008080"><b>1/55</b></font></td>
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<p><font color="#FF0000" size="2" face="Arial"><b>Note: </b><b>The content of this section is not required for the CCNA Exam, and it
will not be on any CCNA Online Assessments.</b><span style="mso-spacerun:
yes"> </span></font></p>
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<p align="center"><font face="Arial" size="2" color="#6486C1"><img border="0" src="../../images/transdot.gif" width="1" height="10"><a href="../../ANSI.pdf" target="_blank"><br>
download</a> a printable version of this entire section (without
graphics) in PDF format (242kB).</font></p>
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<font color="#000000" face="Arial" size="2"><i>This section is provided to share with
our community a major change, which is about to occur. The section contains many technical terms and concepts, which we will be elaborating
upon in future months with more explanations, more graphics, Flash
animations, and interactive Flash activities.</i></font>
<p>
<font COLOR="#000000" face="Arial" size="2">The networking industry
changes very rapidly. One contributing factor to the explosive growth of
LANs, WANs, and the Internet has been the ANSI/TIA/EIA-568-A cabling
standards, in place since 1995. Standards greatly facilitate network
interoperability, network design, network device and component
manufacture, and network installation. Throughout this curriculum, you
will see references to the ANSI/TIA/EIA-568-A standards. </font>
</p>
<p><font COLOR="#000000" face="Arial" size="2">Replacement standards,
known the ANSI/TIA/EIA-B.1, B.2, and B.3 standards, are scheduled to be
completed and released in 2001. But until all of the ANSI/TIA/EIA-568-B
standards are released, the A standards remain in effect. Among other
improvements, these standards will be in much better alignment with the
standards used outside the US ⌨️ 快捷键说明
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