Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) — Question 790

Which multicast operational mode sends a prune message to the source when there are no connected members or downstream neighbors?

Answer options

• A. IGMPv3
• B. PIM dense mode
• C. PIM sparse mode
• D. IGMPv2

Correct answer: B

Explanation

PIM dense mode is designed to quickly send prune messages back to the source when there are no receivers, effectively stopping the multicast traffic. In contrast, IGMP versions and PIM sparse mode do not operate in the same manner; IGMP is used for host membership reporting and PIM sparse mode relies on explicit join requests instead of sending prune messages proactively.