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+<!DOCTYPE html>
+<html lang="en"><head>
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+    <title>Learning Objectives</title>
+</head><body><div class="container-fluid">
+<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>define the domain name system (DNS) and describe what it does.</li>
+<li>explain how DNS works and why it is important to the Internet.</li>
+</ol>
+<h2>Learning Tasks</h2>
+<p>Required:</p>
+<ol>
+<li>Watch the <a href="03_Documents02/comp347u2s4.pdf?isCourseFile=true" target="_self">slideshow</a> for this section.</li>
+<li>Study Section 2.4, DNS—The Internet’s Directory Service, in the textbook.</li>
+</ol>
+<h2>Terms and Topics</h2>
+<div class="row">
+<div class="col-11">
+<p><strong>Section 4 – Domain Name System </strong></p>
+</div>
+<div class="col-1"></div>
+</div>
+<div class="row">
+<div class="col-6">
+<p>DNS servers<br>Host aliasing<br>Canonical hostname<br>Mail server aliasing<br>Loading distribution among replicated servers<br>DNS design strategies<br>Problem with a centralized design<br>Single point of failure<br>Traffic volume<br>Distant centralized database<br>Maintenance of DNS servers<br>The hierarchy of Distributed DNS servers<br>Root DNS servers</p>
+</div>
+<div class="col-6">
+<p>Top-level domain (TLD) servers<br>Authoritative DNS servers<br>Local DNS server<br>Interaction of the various DNS servers<br>Recursive and iterative queries (to DNS servers)<br>DNS caching<br>DNS records and message<br>Resources Records (RRs)<br>Inserting records into DNS database<br>Registrar<br>ICANN</p>
+</div>
+</div>
+<h2>Leading Questions</h2>
+<ol>
+<li>What is DNS? What is DNS used for?</li>
+<li>How does the Domain Name System work?</li>
+<li>Why is DNS so important for the Internet community?</li>
+<li>In DNS, what is host aliasing? Why is it needed?</li>
+<li>What is load distribution in DNS?</li>
+<li>What problems does a centralized DNS design have?</li>
+<li>Why is a distributed database important for DNS?</li>
+<li>What are root DNS servers? What roles do they play?</li>
+<li>What is a top-level domain (TLD) server?</li>
+<li>What are authoritative DNS servers?</li>
+<li>What are so-called local DNS servers?</li>
+<li>What are recursive queries and iterative queries in DNS?</li>
+<li>Why is DNS caching needed?</li>
+<li>What are resource records (RRs) in DNS? What is the format of resource record?</li>
+<li>What are DNS messages? What is the format?</li>
+<li>What can the nslookup command do for you?</li>
+<li>What roles does ICANN do?</li>
+</ol>
+</div>
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