Chapter 2. Network Access and Layer 2 Multicast

Chapter 1, “Introduction to IP Multicast,” examined the differences between unicast, broadcast, and multicast messages. This chapter takes an in-depth look at IP multicast messages at Layer 2 and how they are transported in a Layer 2 domain. This chapter covers the basic elements of multicast functionality in Layer 2 domains as well as design considerations for multicast deployments.

Layered Encapsulation

Before reviewing multicast in Layer 2, we must discuss fundamental packet-forwarding concepts to establish a baseline of the process. Encapsulation is an important component of the OSI model for data communication and is absolutely essential in IP networks. Encapsulation is the method by which ...

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