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Chapter 1 Overview of QuickTime Streaming 19

Multicast Versus Unicast

QuickTime Streaming Server supports both multicast and unicast network transport to

deliver streaming media.

In a multicast, a single stream is shared among the clients (see illustration below). Each

client “tunes in” to the stream much as a radio tunes in to an FM broadcast. This

technique reduces network congestion, but it requires a network that either has access

to the multicast backbone (the “Mbone”) for content distributed over the Internet, or is

multicast-enabled for content distributed within a contained private network.

In a unicast, each client initiates its own stream, resulting in the generation of many

one-to-one connections between client and server (see illustration below). Many clients

connected via unicast to a stream in a local network can result in heavy network traffic.

But this technique is the most reliable for delivery over the Internet since no special

transport support is required.

Multicast

Unicast

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Apple QuickTime Informações Técnicas Página 19