350-501 · Question #19
Refer to the exhibit. If router RA is configured as shown, which IPv4 multicast address space does it use?
The correct answer is C. 232.0.0.0/8. The 232.0.0.0/8 address block is reserved for Source-Specific Multicast (SSM). The exhibit most likely shows 'ip pim ssm default' or a similar SSM-enabling configuration on router RA. SSM is a PIM mode where receivers specify both the multicast group AND the source address…
Question
Refer to the exhibit. If router RA is configured as shown, which IPv4 multicast address space does it use?
Exhibit
Options
- A224.0.0.0/8
- B225.0.0.0/8
- C232.0.0.0/8
- D239.0.0.0/8
How the community answered
(44 responses)- A2% (1)
- C93% (41)
- D5% (2)
Explanation
The 232.0.0.0/8 address block is reserved for Source-Specific Multicast (SSM). The exhibit most likely shows 'ip pim ssm default' or a similar SSM-enabling configuration on router RA. SSM is a PIM mode where receivers specify both the multicast group AND the source address (S,G), as opposed to Any-Source Multicast (ASM) which uses (*, G) entries. The default SSM range is 232.0.0.0/8 as defined by IANA. 224.0.0.0/8 is the overall multicast address space, 225.0.0.0/8 is general ASM space, and 239.0.0.0/8 is the administratively scoped (locally scoped) range for private multicast use.
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