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Unicast, Multicast and Broadcast This lesson covers the following three terms: - Unicast: a single computer (or node) talking to another single computer (or node). - Multicast: One computer (or node) talking to many computers (or nodes). - Broadcast: One computer (or node) to anyone of anything in the broadcast domain, can be reached just by talking to the MAC address. These terms are used to talk about how a device communicates with other devices on a network.