Which capability allows delivering content to multiple destinations efficiently?

• A. Availability
• B. Diversity
• C. Multicast
• D. Security

Answer: (C)

Delivering content to multiple destinations efficiently hinges on distributing one stream to many receivers while minimizing bandwidth usage. This is exactly what multicast does: a sender transmits to a multicast group address, and network routers replicate the stream only along branches where there are interested receivers. This avoids sending separate copies to each destination (as in unicast) and avoids spraying to every node (as in broadcast), making distribution scalable as the number of recipients grows. Protocols like IGMP (IPv4) or MLD (IPv6) manage which hosts belong to the group, and routing protocols build distribution trees to reach all members efficiently.

Availability focuses on reliable access to services, not how content is delivered to many destinations. Diversity concerns signal robustness against interference or fading, not multi-destination delivery. Security centers on protecting content from unauthorized access or tampering, not the efficiency of distributing to multiple endpoints.