<h1 id="udp">Udp<a aria-hidden="true" class="anchor-heading icon-link" href="#udp"></a></h1>
<h1 id="udp-1">udp<a aria-hidden="true" class="anchor-heading icon-link" href="#udp-1"></a></h1>
<ul>
<li>advantages/disadvantages
<ul>
<li>adv:
<ul>
<li>connectionless: no connection establishment, thus no additional delay</li>
<li>fast: no handshake</li>
<li>each segment handled independently</li>
<li>Very simple: no state to maintain</li>
<li>Segment header is small</li>
</ul>
</li>
<li>dis
<ul>
<li>segments may be lost</li>
<li>may out-of-order</li>
<li>no congestion control</li>
<li>There are no guarantees with UDP.</li>
</ul>
</li>
</ul>
</li>
<li>segment format
<ul>
<li>source port, dest port, length(<strong>whole segment</strong> at least 8 byte(header size)), checksum, application data</li>
</ul>
</li>
<li>reliability assumptions
<ul>
<li>Often used for <strong>streaming</strong> multimedia apps </li>
<li>Loss tolerant</li>
<li><strong>Rate sensitive</strong> (timeliness)</li>
<li>Reliability can be added at app layer</li>
</ul>
</li>
</ul>