300-510 · Question #66
Refer to the exhibit. Which task must you perform on interface g1/0/0 to complete the SSM implementation?
The correct answer is D. configure IGMPv3. SSM (Source-Specific Multicast) requires IGMPv3 on host-facing interfaces because SSM operates on (S,G) channel subscriptions where receivers specify both the multicast group AND the source address they want to receive from. IGMPv3 is the only IGMP version that supports source-sp
Question
Refer to the exhibit. Which task must you perform on interface g1/0/0 to complete the SSM implementation?
Options
- Aconfigure OSPFv3
- Benable CDP
- Cdisable IGMP
- Dconfigure IGMPv3
How the community answered
(20 responses)- B5% (1)
- D95% (19)
Explanation
SSM (Source-Specific Multicast) requires IGMPv3 on host-facing interfaces because SSM operates on (S,G) channel subscriptions where receivers specify both the multicast group AND the source address they want to receive from. IGMPv3 is the only IGMP version that supports source-specific membership reports (INCLUDE/EXCLUDE source lists) in its Join messages, which is the mechanism hosts use to signal (S,G) interest to the local router. IGMPv1 and IGMPv2 only support (*, G) any-source multicast joins, which are incompatible with SSM's source-specific model. OSPFv3 (choice A) is an IPv6 routing protocol, unrelated to multicast group membership. CDP (choice B) is a discovery protocol with no role in multicast. Disabling IGMP (choice C) would break host-to-router multicast signaling entirely.
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