400-007 Question #189: Real Exam Question with Answer & Explanation

The correct answer is D: IGMPv3 with PIM-SSM. IGMPv3 combined with PIM-SSM reduces IGMP state by binding receivers to specific sources, eliminating shared tree (*,G) entries from the network.

Question

Which design solution reduces the amount of IGMP state in the network?

Options

Aone multicast group address thorough network regardless of IGMP version
Bmultiple multicast domains
CIGMP filtering
DIGMPv3 with PIM-SSM

Explanation

IGMPv3 combined with PIM-SSM reduces IGMP state by binding receivers to specific sources, eliminating shared tree (*,G) entries from the network.

Common mistakes.

A. Using a single multicast group address throughout the network concentrates all traffic into one group, which creates scaling and management problems rather than reducing IGMP state.
B. Multiple multicast domains segment the network but do not inherently reduce the total IGMP state maintained within each domain or across the overall design.
C. IGMP filtering controls which multicast groups are permitted on specific interfaces but does not reduce the overall IGMP state maintained in the network.

Concept tested. IGMPv3 PIM-SSM multicast state reduction

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_pim/configuration/xe-16/imc-pim-xe-16-book/imc-pim-ssm.html

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