Please pair the following IGMP versions with the corresponding working mechanisms.

Question

Options

• AIGMPv1: Members left in silence, Querier election relies on other protocols; IGMPv2: Querier election is carried out through port protocol election, leaving group members will actively send a leave message.
• B
• C
• D

• A
  77% (27)
• B
  3% (1)
• C
  6% (2)
• D
  14% (5)

Explanation

Option A correctly pairs each IGMP version with its actual protocol behavior as defined in the RFCs. IGMPv1 (RFC 1112) has no built-in querier election process, so it depends on multicast routing protocols like DVMRP to determine which router acts as querier, and hosts simply stop responding to queries when leaving a group rather than sending any notification. IGMPv2 (RFC 2236) introduced two key improvements: an explicit Leave Group message that hosts send when departing a multicast group, and a querier election mechanism where routers compare IP addresses and the router with the lowest IP wins the querier role. Options B, C, and D are blank and present no competing claims to evaluate.

Memory tip: Think of IGMPv2 as the version that added "goodbye messages" - members no longer leave in silence, they say goodbye with a Leave message. The version number went up, and so did the protocol's politeness and self-sufficiency (no longer needing other protocols to elect a querier).

No community discussion yet for this question.