Multicast

Key Points

• One-to-many-to-selected-receivers model
• Used in streaming and network distribution
• More efficient than multiple unicast copies
• Requires group membership or subscription
• Differs from broadcast by limiting to subscribed receivers only
• Differs from unicast by eliminating per-receiver sender replication

Definition

Multicast is a communication method that delivers the same data to a selected group of receivers instead of to one receiver or everyone. It reduces duplicate transmission through network-based replication to group members only.

Concept

Multicast is a networking delivery model used for sharing a data stream with a defined group of receivers. It improves efficiency when multiple recipients need identical information by eliminating the need for the sender to create separate copies for each receiver or broadcast to all network nodes.

Multicast operates through group membership and network support to replicate packets only where needed along the path to subscribers. It is used in streaming media, routing protocols, conferencing, and other group-oriented delivery systems.

Multicast differs from broadcast because only subscribed receivers obtain the data. It differs from unicast because the sender transmits a single stream rather than replicating identical streams per receiver.

Explainer

Multicast is a communication method in which identical data is delivered to a selected group of receivers through network-supported packet replication rather than individual per-receiver transmission or network-wide broadcast.