350-401 Question #810: Real Exam Question with Answer & Explanation

Question

Which two statements about IGMP are true?(Choose two.)

Options

• AIGMPv2 supports explicit source signaling.
• BIGMPv3 is the first version of IGMP to support a basic query-response mechanism.
• CIGMPv2 supports IGMP querier election.
• DIGMPv1 supports group-specific queries.
• EIGMPv3 uses 224.0.0.22 as destination address for reports.

Explanation

IGMPv2 supports querier election, and IGMPv3 uses 224.0.0.22 as the destination address for membership reports.

Common mistakes.

• A. IGMPv3, not IGMPv2, introduced explicit source signaling (Source-Specific Multicast) capabilities.
• B. IGMPv1 was the first version to support a basic query-response mechanism; IGMPv3 enhanced it but did not introduce it.
• D. IGMPv2, not IGMPv1, introduced group-specific queries, allowing a querier to ask about specific multicast groups rather than all groups.

Concept tested. IGMP versions features

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti/configuration/15-mt/imc-15-mt-book/imc-igmp-oview.html

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