blob: 4c4ee35e3f582daf207f4fe0fa125b667e2491a2 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
<!DOCTYPE html>
<html lang="en"><head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="/shared/LCS_HTML_Templates/Athabasca_Template_2021/Template_Files/sample_pages/../../_assets/thirdpartylib/bootstrap-4.3.1/css/bootstrap.min.css">
<!-- Font Awesome CSS -->
<link rel="stylesheet" href="/shared/LCS_HTML_Templates/Athabasca_Template_2021/Template_Files/sample_pages/../../_assets/thirdpartylib/fontawesome-free-5.9.0-web/css/all.min.css">
<!-- Template CSS -->
<link rel="stylesheet" href="/shared/LCS_HTML_Templates/Athabasca_Template_2021/Template_Files/sample_pages/../../_assets/css/styles.min.css">
<link rel="stylesheet" href="/shared/LCS_HTML_Templates/Athabasca_Template_2021/Template_Files/sample_pages/../../_assets/css/custom.css">
<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>
<div class="col-12"><footer><!-- <p>© [Client] [Year]</p> --> <!-- <p><img src="/shared/LCS_HTML_Templates/Athabasca_Template_2021/_assets/img/logo.png" alt="logo"></p> --></footer></div>
</div>
</div>
<p>
<script src="/shared/LCS_HTML_Templates/Athabasca_Template_2021/Template_Files/sample_pages/../../_assets/thirdpartylib/jquery/jquery-3.4.1.min.js">
</script>
<script src="/shared/LCS_HTML_Templates/Athabasca_Template_2021/Template_Files/sample_pages/../../_assets/thirdpartylib/popper-js/popper.min.js">
</script>
<script src="/shared/LCS_HTML_Templates/Athabasca_Template_2021/Template_Files/sample_pages/../../_assets/thirdpartylib/bootstrap-4.3.1/js/bootstrap.min.js">
</script>
</p>
<!-- Template JavaScript -->
<p>
<script src="/shared/LCS_HTML_Templates/Athabasca_Template_2021/Template_Files/sample_pages/../../_assets/js/scripts.min.js"></script>
<script src="/shared/LCS_HTML_Templates/Athabasca_Template_2021/Template_Files/sample_pages/../../_assets/js/custom.js"></script>
</p></body></html>
|
