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+    <title>Section 1: Introduction to the Network Layer</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>relate what the network layer is and what it does.</li>
+<li>explain data plane functions of the network layer.</li>
+<li>explain the various network service models that the network layer provides.</li>
+<li>explain the network service model’s relationship to the layers below and above it in the Internet protocol stack.</li>
+<li>explain why networks were divided into the data plane and the control plane.</li>
+<li>describe the differences between virtual-circuit networks and datagram networks.</li>
+</ol>
+<h2>Learning Tasks</h2>
+<p>Required</p>
+<ol>
+<li>Watch the <a href="03_Documents04/comp347u4s1.pdf?isCourseFile=true" target="_self">slideshow</a> for this section.</li>
+<li>Study Section 4.1, Overview of Network Layer, in the textbook.</li>
+</ol>
+<h2>Terms and Topics</h2>
+<div class="row">
+<div class="col-11">
+<p><strong>Section 1 – Introduction to the Network Layer </strong></p>
+</div>
+<div class="col-1"></div>
+</div>
+<div class="row">
+<div class="col-6">
+<p>Network layer<br>Host-to-host communication<br>IP forwarding<br>Data plane<br>Primary role of data plane in network layer<br>Primary role of control plane of network layer<br>Forwarding and routing<br>Forwarding table<br>Software-defined networking (SDN)<br>Link layer switches<br>Connection setup<br>Network layer service model<br>Network layer services<br>Guaranteed delivery<br>Guaranteed delivery with bounded delay</p>
+</div>
+<div class="col-6">
+<p>Origin of VC and datagram networks<br>What is inside a router?<br>In-order packet delivery<br>Guaranteed minimal bandwidth<br>Guaranteed maximum jitter<br>Security service<br>Best-effort service<br>ATM network architecture<br>Constant bit rate (CBR) network service<br>Available bit rate (ABR) ATM network service<br>Link-layer switches</p>
+</div>
+</div>
+<h2>Leading Questions</h2>
+<ol>
+<li>What services are provided by network layer protocols?</li>
+<li>What are the two important network-layer functions?</li>
+<li>What does forwarding do for a router?</li>
+<li>What does routing do for an interconnected network?</li>
+<li>For packets to be transported from a sending host to a receiving host, what important functions must be performed at the network layer?</li>
+<li>What is a network-service model?</li>
+<li>What are virtual circuits?</li>
+<li>What is the virtual-circuit network service model?</li>
+<li>What are the three identifiable phases in a virtual circuit?</li>
+<li>What is the datagram network service model?</li>
+<li>What is the constant bit rate (CBR) network service model for ATM networks?</li>
+<li>What is the unspecified bit rate (UBR) network service model for ATM networks?</li>
+<li>What is the variable bit rate (VBR) network service model for ATM networks?</li>
+<li>What are the origins of the datagram and virtual-circuit service models?</li>
+<li>What functions does an input port on a router perform?</li>
+<li>In detail, what does the switching fabric do in a router?</li>
+<li>How does switching via memory work?</li>
+<li>How does switching via a bus work?</li>
+<li>How does stitching via an interconnection network work?</li>
+<li>What does an output port on a router do?</li>
+<li>What does the router processor do for a router?</li>
+<li>What is an SDN router?</li>
+<li>Destination-based forwarding is easy to understand. What is the rationale for generalized forwarding on a router?</li>
+<li>What critical questions do router and switch designers face?</li>
+<li>What is <em>prefix matching</em> in the context of looking up a forwarding table to decide the destination of a packet? What is the longest prefix matching rule?</li>
+<li>Where does queuing occur inside a router?</li>
+<li>When does packet-loss occur in a router?</li>
+</ol>
+</div>
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