Please match the following mechanisms in PIM-DM with their corresponding concepts: diffusion mechanism, pruning mechanism, assertion mechanism Multicast data packets are flooded to all PIM…

Question

Options

• Adiffusion mechanism: Multicast data packets are flooded to all PIM neighbors, and multicast routers generate multicast routing entries; pruning mechanism: If there is no group member under the multicast router, the router sends a pruning forwarding path from the source to the multicast router; assertion mechanism: When there are multiple access networks in the process of multicast forwarding, the router needs to be elected to avoid duplication of multicast packets
• B
• C
• D

• A
  80% (28)
• B
  6% (2)
• C
  11% (4)
• D
  3% (1)

Explanation

Option A correctly maps each PIM-DM mechanism to its function: the diffusion mechanism describes the initial flood-and-learn behavior where multicast packets are broadcast to all PIM neighbors so routers can build their forwarding tables; the pruning mechanism describes how routers with no downstream group members send Prune messages upstream to cut themselves off the forwarding tree; and the assertion mechanism describes the election process used on multi-access segments (like Ethernet) to designate a single forwarder and prevent duplicate packets.

Options B, C, and D are not provided in this question, meaning A is the only viable match - the definitions in the stem map cleanly and unambiguously to the three mechanisms with no alternative ordering that would make logical sense.

Memory tip: Think of PIM-DM as "Flood, Prune, Elect" - first it diffuses (floods) everywhere, then prunes back branches with no listeners, then uses assertion to elect one router when multiple share the same link. The three mechanisms follow that exact lifecycle order.

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