CCNP/CCDP Switch (642-813) practice questions: 

PIM Sparse Mode Multicasting

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Q9. Which of the following instances, will PIM Sparse Mode Multicasting is recommended over PIM Dense Mode?

         A. When there is high Multicast traffic volume in the network.

         B. Senders and receivers of Multicast traffic are closely located.

         C. Senders and receivers are distributed sparsely throughout the network.

        D. The type of traffic is heavy and constant.

Correct Answer: C

Explanation: 

Protocol Independent Multicasting Dense Mode (PIM DM) is recommended when the following are true:
1. Multicast traffic is heavy and constant.
2. Senders and receivers are located close enough that the Multicast traffic does not put strain on valuable long distance bandwidth.
3. There are large number of receivers of Multicast traffic.

PIM Sparse Mode is recommended under the following circumstances:
1. The receivers of Multicast traffic are distributed sparsely,
2. The Multicast traffic is light and intermittent.

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