IGMPv3 only supports IGMPv1 General Query and IGMPv2 Group-Specific Query, and also IGMPv3 Source/Group-Specific Query.

Question

Options

• ATRUE
• BFALSE

• A
  69% (18)
• B
  31% (8)

Explanation

Option A is correct because IGMPv3 is designed with backward compatibility in mind, meaning it recognizes and processes query messages from older IGMP versions alongside its own. Specifically, it supports the IGMPv1 General Query (which targets all multicast groups on a subnet), the IGMPv2 Group-Specific Query (which targets a single multicast group), and the IGMPv3 Group-and-Source-Specific Query (which targets a specific group and a list of source addresses, enabling source filtering). These three query types collectively represent all query messages an IGMPv3 router can send or a host must handle. Option B is wrong because the statement accurately describes IGMPv3's supported query types -- denying it would mean claiming IGMPv3 lacks backward compatibility or the source-filtering query, both of which contradict RFC 3376.

Memory tip: Think of IGMP versions as building blocks -- v1 introduced the General Query, v2 stacked on the Group-Specific Query, and v3 added the Source/Group-Specific Query on top. IGMPv3 carries all three layers.

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