300-420 exam dumps

300-420 practice question 284 of 323

Designing Cisco Enterprise Networks. Professional level, Cisco. Free question with the correct answer and a full explanation.

300-420 Question 284

Single answer

An enterprise network requires the deployment of a multicast solution for a financial trading application that requires source-specific multicast (SSM). The design must ensure efficient utilization of network resources and simplicity in configuration. Which of the following multicast protocols and mechanisms are BEST suited for this design?

  1. A

    PIM Sparse Mode (PIM-SM) with Rendezvous Points (RPs)

  2. B

    PIM Source-Specific Multicast (PIM-SSM)

  3. C

    Multicast Source Discovery Protocol (MSDP) with RPs

  4. D

    PIM Bidirectional (PIM-Bidir)

Show answer and explanation

Correct answer: B

Explanation

The most suitable protocol for source-specific multicast (SSM) is PIM-SSM, as it simplifies the configuration by eliminating the need for RPs and directly supports the one-to-many communication model required by SSM. Other protocols, such as PIM-SM and MSDP, involve additional complexities like RP configuration, which are unnecessary for SSM use cases.

  • A. Incorrect.

    PIM Sparse Mode (PIM-SM) with RPs is a general-purpose multicast routing protocol suitable for applications with many receivers and sources. However, it introduces additional overhead with RP configuration and is not as efficient for source-specific multicast (SSM).

  • B. Correct.

    PIM Source-Specific Multicast (PIM-SSM) is specifically designed for SSM use cases. It allows receivers to explicitly request traffic from specific multicast sources, eliminating the need for RPs and reducing configuration complexity and overhead.

  • C. Incorrect.

    Multicast Source Discovery Protocol (MSDP) is used in conjunction with PIM-SM to share multicast source information between RPs in different domains. However, it is not required in an SSM model, as SSM does not use RPs.

  • D. Incorrect.

    PIM Bidirectional (PIM-Bidir) is suitable for many-to-many multicast applications where traffic flows bidirectionally between sources and receivers. It is not optimal for SSM, which is a one-to-many model.

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