Cisco
352-001 · Question #649
352-001 Question #649: Real Exam Question with Answer & Explanation
The correct answer is C: The IANA assigned range is 232.0.0.0/8. Source Specific Multicast (SSM) uses the IANA-reserved 232.0.0.0/8 range and eliminates Rendezvous Points by allowing receivers to subscribe directly to a specific source.
Question
When designing a Source Specific Multicast solution, what must you consider?
Options
- AIt lacks support for URL Rendezvous Directory
- BInitial multicast traffic will flow over the RPT
- CThe IANA assigned range is 232.0.0.0/8
- DEmbedded RP can be used for RP discovery
Explanation
Source Specific Multicast (SSM) uses the IANA-reserved 232.0.0.0/8 range and eliminates Rendezvous Points by allowing receivers to subscribe directly to a specific source.
Common mistakes.
- A. URL Rendezvous Directory (URD) is a Cisco mechanism specifically designed to aid SSM source discovery, meaning SSM does have support for URD rather than lacking it.
- B. SSM does not use a Rendezvous Point Tree (RPT) at all - traffic always flows directly on the Shortest Path Tree from source to receiver; initial RPT usage is a characteristic of PIM-SM Any Source Multicast, not SSM.
- D. Embedded RP is a PIM-SM feature used in IPv6 ASM deployments to encode the RP address within the group address for RP discovery; SSM has no RP and therefore embedded RP is not applicable.
Concept tested. SSM IANA address range and RP-less multicast design
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