IGMPv1 also supports the general group query of IGMPv1 version and the specific group query of IGMPv2 version, but also supports the specified source/group query of IGMPv3 version.

Question

Options

• ATRUE
• BFALSE

• A
  84% (32)
• B
  16% (6)

Explanation

Note: This question contains an apparent typo - "IGMPv1" in the opening should read "IGMPv3." The statement is TRUE when applied to IGMPv3.

Option A is correct because IGMPv3 is backward-compatible with both prior versions and introduces a third query type. Specifically, IGMPv3 supports: (1) general group queries (inherited from IGMPv1), which query all groups on a subnet; (2) group-specific queries (inherited from IGMPv2), which target a single multicast group; and (3) group-and-source-specific queries (new in IGMPv3), which allow a querier to ask who wants traffic from a particular source for a particular group - enabling Source-Specific Multicast (SSM).

Option B (FALSE) is wrong because IGMPv3 genuinely does support all three query types - this is a core design goal of IGMPv3 to maintain interoperability with older implementations while adding SSM capability.

Memory tip: Think of IGMPv3 as a superset - it "speaks" the language of v1 and v2 while adding source-awareness. The three query types correspond to three levels of specificity: "Who wants anything?" (v1 general) → "Who wants this group?" (v2 group-specific) → "Who wants this group from this source?" (v3 source+group-specific).

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