350-401 · Question #610
Which enhancement does IGMP version 3 offer over IGMP version 2?
The correct answer is A. support for Source Specific Multicast. IGMPv3's key enhancement over IGMPv2 is its ability to support Source Specific Multicast, allowing hosts to specify which multicast sources they want to receive traffic from.
Question
Which enhancement does IGMP version 3 offer over IGMP version 2?
Options
- Asupport for Source Specific Multicast
- Ba mechanism to decrease leave latency
- Cauthentication of multicast streams
- Dbackward compatibility with IGMP version 1
How the community answered
(45 responses)- A89% (40)
- B7% (3)
- C2% (1)
- D2% (1)
Why each option
IGMPv3's key enhancement over IGMPv2 is its ability to support Source Specific Multicast, allowing hosts to specify which multicast sources they want to receive traffic from.
IGMPv3 introduces the capability for hosts to explicitly specify the sources from which they wish to receive multicast traffic, a feature known as Source Specific Multicast (SSM), which was not available in IGMPv2.
While IGMPv3 refines group leave messaging, the primary and most significant enhancement regarding new functionality is SSM, and IGMPv2 already had mechanisms like Leave Group messages to decrease leave latency.
IGMP is a signaling protocol for group membership and does not provide authentication for multicast streams; this functionality is typically handled at higher layers or by other security protocols.
All versions of IGMP are designed with some level of backward compatibility, but this is a general design principle for protocol evolution and not a unique enhancement of IGMPv3 over IGMPv2.
Concept tested: IGMPv3 Source Specific Multicast capabilities
Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12-2/50sg/configuration/guide/config/ipmcast.html
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