300-420 Question 285
Single answerAn enterprise network is designing a multicast solution for a video streaming service. The service requires that multicast receivers explicitly subscribe to specific multicast groups and that the multicast traffic flows directly from the source to the receivers without relying on Rendezvous Points (RPs). Which multicast design should be implemented to meet these requirements?
- A
Source Specific Multicast (SSM)
- B
PIM Bidirectional (PIM-Bidir)
- C
Multicast Source Discovery Protocol (MSDP)
- D
Any Source Multicast (ASM)
Show answer and explanation
Correct answer: A
Explanation
Source Specific Multicast (SSM) is the most suitable design for this scenario because it allows receivers to explicitly subscribe to specific multicast sources and eliminates the need for Rendezvous Points (RPs). This ensures a direct source-to-receiver traffic flow, fulfilling the stated requirements of the video streaming service.
- A. Correct.
Source Specific Multicast (SSM) is designed for scenarios where receivers explicitly request traffic from specific multicast sources, and it does not rely on Rendezvous Points (RPs), making it the ideal choice for this requirement.
- B. Incorrect.
PIM Bidirectional (PIM-Bidir) is used for applications where multicast traffic flows in both directions between sources and receivers, and it relies on Rendezvous Points (RPs), which does not meet the stated requirements.
- C. Incorrect.
Multicast Source Discovery Protocol (MSDP) is used to share multicast source information between different autonomous systems but is not a multicast forwarding method itself. It is not applicable in this scenario.
- D. Incorrect.
Any Source Multicast (ASM) is a general multicast model that relies on Rendezvous Points (RPs) for discovering sources, which does not align with the requirement to avoid RPs.