Which of the following statements regarding IGMPv1 and IGMPv2 are true?

Question

Options

• AIGMPv2 supports only general query.
• BIGMPv1 supports general query type.
• CIGMPv2 does not define the IGMP Leave message type.
• DIGMPv1 supports general query.

• A
  4% (1)
• B
  80% (20)
• C
  12% (3)
• D
  4% (1)

Explanation

Option B is correct because IGMPv1 defines a Host Membership Query that operates as a general query, sent to all multicast-capable hosts (224.0.0.1) to discover which multicast groups have active members - this is the only query type IGMPv1 supports, and it is by nature a general query type. Option A is wrong because IGMPv2 expanded query support to include both general queries and group-specific queries, not just general queries. Option C is wrong because IGMPv2 actually introduced the Leave Group message - it was IGMPv1 that lacked Leave messages, forcing routers to wait for a timeout before pruning a group. Option D is subtly wrong because the term "general query" as a formally named message type was introduced in IGMPv2 to distinguish it from the new group-specific query; IGMPv1's query is called a "Host Membership Query," so saying it "supports general query" uses terminology that belongs to IGMPv2.

Memory tip: Think of each version adding one major feature - IGMPv2 added the Leave message and group-specific queries, making "Leave" and "group-specific" keywords that belong exclusively to v2, while v1 only ever had the one broad membership query.

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