What is one of the protocols required for multicast communication?

Multicast communication relies on protocols specifically designed to manage the distribution of data to multiple receivers simultaneously. A multicast routing protocol is essential for this function because it helps define how multicast groups are established, tracked, and managed within a network. These protocols ensure that multicast traffic is efficiently routed only to the segments of the network where there are active group members, thus optimizing bandwidth and reducing unnecessary load on the network.

In contrast, routing information protocols like RIP, application-level protocols like HTTP, and naming services like DNS do not facilitate multicast communication. RIP is primarily used for unicast routing, HTTP is a protocol for web communications and does not handle multicast, and DNS resolves domain names but is not related to the transmission of data to multiple recipients. Therefore, the multicast routing protocol is the correct choice, as it directly supports and enables multicast communication in network environments.