Which communication type uses a one-to-many model to replicate packets that are delivered to many interested recipients?

Unknown unicast occurs when a switch floods a frame out all ports because the destination MAC is absent from its MAC address table - it is not a deliberate delivery model.

Broadcast delivers packets to all devices on a segment regardless of interest, making it a one-to-all model rather than a selective one-to-many model.

Unicast is a one-to-one communication model where each packet is addressed to a single specific destination host.

Multicast addresses a group of interested receivers using IPv4 addresses in the 224.0.0.0-239.255.255.255 range, and hosts signal their group membership via IGMP so routers replicate traffic only toward interested segments. This approach conserves bandwidth compared to sending individual unicast streams to each recipient, making it ideal for video streaming and real-time conferencing.