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<!DOCTYPE html>
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<title>Section 5: Peer-to-Peer File Distribution</title>
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<div class="row">
<div class="offset-sm-1 col-sm-10">
<h2>Learning Objectives</h2>
<p>After successfully completing this section, you should be able to</p>
<ol>
<li>explain application protocols for file sharing.</li>
<li>describe how P2P file sharing systems work.</li>
</ol>
<h2>Learning Tasks</h2>
<p>Required:</p>
<ol>
<li>Watch the <a href="03_Documents02/comp347u2s5.pdf?isCourseFile=true" target="_self">slideshow</a> for this section.</li>
<li>Study Section 2.5, Peer-to-Peer File Distribution, in the textbook.</li>
<li>Search the Internet for <em>peer churn</em>. Select the two most interesting articles, read them, and post the links to the course forum along with your commentary.</li>
</ol>
<h2>Terms and Topics</h2>
<div class="row">
<div class="col-11">
<p><strong>Section 5 – Peer-to-Peer File Distribution </strong></p>
</div>
<div class="col-1"></div>
</div>
<div class="row">
<div class="col-6">
<p><strong>P2P file distribution</strong><br>Scalability of P2P architectures<br>Distribution time<br>Minimum file distribution time<br>File distribution problem<br>BitTorrent<br>Rarest first</p>
</div>
<div class="col-6">
<p>Unlocked peers<br>Optimistically unlocked peers<br>Distributed hash table (DHT)<br>Circular DHT<br>Overlay network<br>Peer churn</p>
</div>
</div>
<h2>Leading Questions</h2>
<ol>
<li>What is a peer-to-peer network application?</li>
<li>What are the differences between client-server applications and peer-to-peer applications?</li>
<li>How is P2P used for file distribution?</li>
<li>Why is it said that P2P architecture is self-scalable?</li>
<li>What is the file distribution problem?</li>
<li>How is distribution time calculated for a P2P file distribution system?</li>
<li>What does the BitTorrent system do?</li>
<li>Where are distributed hash tables (DHTs) used?</li>
<li>How does circular DHT work?</li>
<li>What is an overlay network? How does it work?</li>
<li>What does <em>peer churn</em> mean in P2P systems?</li>
</ol>
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