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WPA allows you to specify the type of encryption used for unicast and broadcast or multicast frames.
It also includes the VideoLAN Client, which can be used as a server to stream MPEG - 1, MPEG - 2 and MPEG - 4 files and DVDs on the network in unicast or multicast.
The presentation can be coordinated as a multicast to simultaneous users and as a unicast , for users who want to see the presentation after the fact.
Bottom line, says Bhatia: Streaming content to consumers from edge-servers is less expensive, with better quality than anything you send from a central data center, via a unicast model, where every consumer is ‘hitting’ the same server.
the unicast method wastes a lot of bandwidth by sending duplicate information
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