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With the term multicast, in computer networks, there is a possibility for a message to reach a group of destinations.

You can configure routers to handle hosts group. Besides the notion of unicast (single host) and the notion of broadcast (all hosts), there is also the notion of a group, namely multicast, which allows the message to reach only a subset of recipients that belong to the same group. To be able to handle this new way of communicating properly, you need to configure CISCO routers as explained in the following videos. These, in my opinion, are the best internet videos that allow you to accurately explain this type of configuration.