Final answer:
IPv6 multicasts allow sending packets to a group of interested receivers, while broadcasts (used in IPv4) send messages to all devices in a segment. IPv6 does not support traditional broadcasts and uses more efficient methods like multicasting.
Step-by-step explanation:
The question asks how IPv6 multicasts differ from broadcasts. In networking, these two methods are used to send data to multiple destinations. IPv6 multicasts allow a source to send a packet to a group of receivers defined by a single multicast address. This is more efficient in a large network because it targets only the devices that need to receive the message.
Unlike multicasts, broadcasts are sent to all devices within a network segment and can lead to unnecessary traffic and potential congestion, especially in large networks. IPv6 actually does not support the traditional broadcast addressing method used in IPv4, and instead, uses multicasting and anycast addressing to achieve similar but more controlled and efficient results.