by 
Oddjob
ANSWERS: 1
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Unicast is a type of packet broadcast addressing that usually uses UDP. Other related forms are, Directed broadcast, Multicast, and Anycast. The purpose can be to send a packet stream to one or many destinations simultaneously. For example, when imaging several computer's hard drives over a network. As far as I know they always use the class D address range. (224.0.0.0/24 for example) If anybody else could comment, I'd be interested to hear what they have to say. Wikipedia has good information about all of this and more: http://en.wikipedia.org/wiki/IP_Multicast#Addressing
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