Refer to the exhibit. The network is configured with OSPF. A networking team just connected a streaming multicast server to router R7, and they now must enable access for users throughout the…

PIM-DM (Dense Mode) uses a flood-and-prune mechanism, which can be inefficient and overload the network, especially if implemented only on a single link, it does not provide network-wide streaming.

While PIM-SM is efficient, implementing it only on a specific LAN segment is insufficient for enabling network-wide access to the streaming server.

Implementing PIM-SM (Protocol Independent Multicast-Sparse Mode) on all routers and their connected links is the most efficient and scalable approach for network-wide video streaming, as it uses an explicit join model to deliver multicast traffic only to interested receivers, preventing network overload from unnecessary flooding.

Implementing PIM-DM widely is not recommended for networks with potentially sparse receivers or high-bandwidth streams because its flood-and-prune behavior can lead to network congestion and inefficiency.