• Unit 6: The Link Layer

    The final layer of the TCP/IP protocol stack that you will learn in this course is known as the link layer. This unit will explain how you can address machines on a network from that layer, use IP addresses to determine physical addresses, and identify the different mechanisms in the link layer that can correct packet collisions when data is transferred over the wire.

    This unit guides you through the principles of the link layer. Then the textbook will direct your focus to computer networks with a discussion of how multiple hosts share one transmission medium. The chapter ends with a detailed discussion of the two types of computer networks that are important today from a deployment perspective: Ethernet and Wi-Fi.

    Completing this unit should take you approximately 7 hours.

    • 6.1: Principles

      • 6.1.1: Framing

      • 6.1.2: Error Detection

    • 6.2: Medium Access Control

      • 6.2.1: Static Allocation Methods

      • 6.2.2: ALOHA

      • 6.2.3: Carrier Sense Multiple Access (CSMA)

      • 6.2.4: CSMA With Collision Detection

      • 6.2.5: CSMA with Collision Avoidance (CSMA/CA)

      • 6.2.6: Deterministic Medium Access Control Algorithms

    • 6.3: Technologies

      • 6.3.1: Point-to-Point Protocol

      • 6.3.2: Ethernet

        • 6.3.2.1: Ethernet Switches

        • 6.3.2.2: The Spanning Tree Protocol (802.1d)

        • 6.3.2.3: Virtual LANs

    • 6.4: Summary and a Review of Hub, Switch, and Network Router

    • 6.5: Practice Exercises

    • Unit 6 Assessment