Which router is elected the IGMP Querier when more than one router is in the same LAN segment?

Question

Options

• AThe router with the shortest uptime
• BThe router with the lowest IP address
• CThe router with the highest IP address
• DThe router with the longest uptime

• A
  3% (1)
• B
  95% (38)
• C
  3% (1)

Explanation

IGMP Querier Election Explained

When multiple routers exist on the same LAN segment, the router with the lowest IP address wins the IGMP Querier election. This is a defined rule in the IGMP protocol standard (RFC 2236), ensuring a deterministic, tie-free selection process - since no two devices share the same IP address, there is always a clear winner responsible for sending IGMP Query messages to discover multicast group members.

Why the distractors are wrong:

• A (shortest uptime) and D (longest uptime) are incorrect because uptime is irrelevant to IGMP querier election - this is not a stability-based or seniority-based selection process.
• C (highest IP address) is the opposite of the correct rule and is a common trap designed to catch candidates who mix this up with other protocol elections.

Memory Tip: Think "Low IP = Leader" - in IGMP, the router with the Lowest IP is the Leader (Querier). This also helps distinguish it from some other elections (like OSPF DR) where the highest value wins - IGMP is the low wins protocol.

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