350-401 · Question #408
Drag and Drop Question Drag and drop the characteristics of PIM Dense Mode from the left to the right. Not all options are used. Answer:
The correct answer is builds source-based distribution trees; uses a push model to distribute multicast traffic; uses prune mechanisms to stop unwanted multicast traffic. PIM Dense Mode (PIM-DM) assumes multicast traffic is needed everywhere in the network, so it floods traffic to all routers and then uses explicit prune messages to stop forwarding on links where no receivers exist - this is the 'push' model. It builds source-based (shortest-path)
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- builds source-based distribution trees
- uses a push model to distribute multicast traffic
- uses prune mechanisms to stop unwanted multicast traffic
Explanation
PIM Dense Mode (PIM-DM) assumes multicast traffic is needed everywhere in the network, so it floods traffic to all routers and then uses explicit prune messages to stop forwarding on links where no receivers exist - this is the 'push' model. It builds source-based (shortest-path) distribution trees rooted at the multicast source, meaning each source has its own dedicated tree. These three characteristics - source-based trees, push model, and prune mechanisms - together define how PIM-DM operates fundamentally.
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