300-420 Question 279
Select 2A company is deploying a multicast application in its enterprise network. The network administrator decides to use a shared tree multicast routing model to optimize resource utilization. Which of the following concepts are critical to the operation of the shared tree model?
- A
Rendezvous Point (RP)
- B
Reverse Path Forwarding (RPF)
- C
Source-Based Tree (SBT)
- D
Shortest Path Tree (SPT)
- E
Multicast Distribution Group
Show answer and explanation
Correct answers: A, B
Explanation
In a shared tree multicast routing model, the Rendezvous Point (RP) acts as the central coordination point where sources and receivers meet. Reverse Path Forwarding (RPF) ensures loop-free and optimal delivery of multicast traffic by checking the path of incoming multicast packets. These concepts are fundamental to the operation of shared tree multicast routing, while concepts like SBT and SPT are specific to source-based multicast models.
- A. Correct.
The Rendezvous Point (RP) is a critical component in the shared tree multicast model, as it serves as the central point where multicast sources and receivers initially meet to set up the multicast distribution.
- B. Correct.
Reverse Path Forwarding (RPF) ensures that multicast traffic flows efficiently and prevents loops by verifying that multicast packets arrive on the correct interface based on the unicast routing table.
- C. Incorrect.
Source-Based Tree (SBT) is related to the shortest path tree model, not the shared tree model. It builds individual trees per source, which is not utilized in shared tree multicast routing.
- D. Incorrect.
Shortest Path Tree (SPT) is used in source-based multicast routing, where each source has a dedicated tree. This is not applied in the shared tree model.
- E. Incorrect.
While multicast distribution groups are essential for multicast communication, they are not a specific concept tied to the shared tree model itself.