rc="./Zipfile.002.png" alt="Zipfile.002.png" />
</td></tr></table>

</section>
<section id="sec-7-2-1" >

<h4>Dependency Fields</h4>
<ul class="org-ul">
<li>Fields that depend on data layout or values of other fields
<ul class="org-ul">
<li>Length
</li>
<li>Offsets
</li>
<li>Checksums
</li>
</ul>
</li>
<li>Nail never exposes them to the programmer
<ul class="org-ul">
<li>Programmer might forget to update length field when adding answers to a DNS packet
</li>
<li>Programmer should not have to find the right 