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<a accesskey="1" href="page.php?w=TSIG&amp;p=3">1.Previous</a><br />
<a accesskey="3" href="page.php?w=TSIG&amp;p=5">3.Next</a>
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<p>clock.  Since DNS servers are connected to a network, the <a href="page.php?w=Network_Time_Protocol">Network Time Protocol</a> can provide an accurate time source.</p>

<p>DNS updates, like queries, are normally transported via <a href="page.php?w=User_Datagram_Protocol">UDP</a> since it requires lower overhead than <a href="page.php?w=Transmission_Control_Protocol">TCP</a>.  However, DNS servers support both UDP and TCP requests.</p>

<p><big>Implementation</big></p>
<p>An update, as specified in RFC 2136, is a set of instructions to a DNS server.  These</p><p>
<a accesskey="1" href="page.php?w=TSIG&amp;p=3">1.Previous</a><br />
<a accesskey="3" href="page.php?w=TSIG&amp;p=5">3.Next</a>
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