300-420 Question 280
Single answerAn organization is deploying multicast in its network to support live video streaming. The network engineer has decided to use PIM Sparse Mode (PIM-SM) for multicast routing. During the implementation, the engineer needs to ensure that multicast sources and receivers can join the multicast group efficiently. Which concept is responsible for initially connecting multicast sources and receivers in a Sparse Mode environment?
- A
Reverse Path Forwarding (RPF)
- B
Rendezvous Point (RP)
- C
Source-Based Trees (SBT)
- D
Shared Trees (ST)
Show answer and explanation
Correct answer: B
Explanation
In PIM Sparse Mode (PIM-SM), the Rendezvous Point (RP) is a critical component. It serves as the initial meeting point for multicast sources and receivers. Sources register with the RP, and receivers send join messages to the RP to receive the multicast traffic. This ensures efficient group management and routing in a Sparse Mode environment.
- A. Incorrect.
RPF is used by multicast routing protocols to ensure that multicast traffic follows the correct path back to the source, but it is not responsible for initially connecting sources and receivers in PIM-SM.
- B. Correct.
The RP acts as a central point in PIM-SM where multicast sources register and receivers are initially joined. It facilitates the initial connection between sources and receivers.
- C. Incorrect.
Source-Based Trees are created after the initial connection between sources and receivers, but they are not responsible for the initial joining process in PIM-SM.
- D. Incorrect.
Shared Trees are used in PIM-SM to connect multiple receivers to a single source via the RP, but this is a mechanism, not the entity responsible for the initial connection.