In PIM-DM, multicast data will be diffused across the entire network periodically (default ____ seconds). The main purpose of periodic diffusion is to detect whether new group members are added to…

The correct answer is A. 180. In PIM-DM (Protocol Independent Multicast - Dense Mode), the flood-and-prune cycle repeats every 180 seconds by default, making option A correct. After an initial flood, routers on pruned branches send Prune messages to stop unwanted traffic, but the network must periodically…

IPv4 Routing Technologies

Question

In PIM-DM, multicast data will be diffused across the entire network periodically (default ____ seconds). The main purpose of periodic diffusion is to detect whether new group members are added to the group.

Options

A180
B30
C60
D120

How the community answered

(61 responses)

A
77% (47)
B
13% (8)
C
3% (2)
D
7% (4)

Explanation

In PIM-DM (Protocol Independent Multicast - Dense Mode), the flood-and-prune cycle repeats every 180 seconds by default, making option A correct. After an initial flood, routers on pruned branches send Prune messages to stop unwanted traffic, but the network must periodically re-flood to discover any new receivers that joined during the pruned interval. Options B (30s) and C (60s) are too short and would cause excessive network overhead, while option D (120s) is a plausible but incorrect interval sometimes confused with other protocol timers.

Memory tip: 180 seconds equals 3 minutes, which matches the default PIM-DM state refresh period -- think "three-minute reset" to associate the value with the periodic diffusion cycle.

Topics

#PIM-DM#Multicast flooding#Group membership detection#Protocol timers

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