350-401 · Question #1277
With IGMPv2, which multicast group address does the IGMP querier use to send query messages to all hosts on the LAN?
The correct answer is B. 224.0.0.1. In IGMPv2, the IGMP querier sends general query messages to the all-hosts multicast group address 224.0.0.1 to discover which multicast groups are active on the LAN.
Question
With IGMPv2, which multicast group address does the IGMP querier use to send query messages to all hosts on the LAN?
Options
- A239.0.0.2
- B224.0.0.1
- C239.0.0.1
- D224.0.0.2
How the community answered
(32 responses)- A3% (1)
- B94% (30)
- D3% (1)
Why each option
In IGMPv2, the IGMP querier sends general query messages to the all-hosts multicast group address 224.0.0.1 to discover which multicast groups are active on the LAN.
239.0.0.2 is a locally administered multicast address range and is not the standard all-hosts address used by IGMP queriers.
With IGMPv2, the IGMP querier sends General Query messages to the well-known all-hosts multicast group address 224.0.0.1 (all systems on this subnet). This address ensures that all devices capable of processing IGMP messages on the segment receive the query.
239.0.0.1 is a locally administered multicast address and is not the standard all-hosts address used by IGMP queriers.
224.0.0.2 is the all-routers multicast address, used by routing protocols like OSPF and EIGRP, not by IGMP queriers for general host queries.
Concept tested: IGMPv2 query messages
Source: https://www.cisco.com/c/en/us/td/docs/ios/ipmulti/configuration/guide/imc_igmp.html
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