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Exam JN0-648 topic 1 question 36 discussion

Actual exam question from Juniper's JN0-648
Question #: 36
Topic #: 1
[All JN0-648 Questions]

Click the Exhibit button.

Referring to the exhibit, a PIM-SM network is set up to enable communication between multicast devices.
Which statement is true in this scenario?

  • A. After the formation of the shortest-path tree, a prune message is sent from R1 to R5.
  • B. After the formation of the shortest-path tree, a prune message is sent from R1 to R2.
  • C. After the formation of the shortest-path tree, a join message is sent from R5 to R1.
  • D. After the formation of the shortest-path tree, a join message is sent from R1 to R5.
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Suggested Answer: B 🗳️

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rrahim
4 years, 4 months ago
https://www.juniper.net/documentation/en_US/junos/topics/concept/multicast-pim-sparse-characteristics.html When the first multicast packet is received by the receiver’s DR, the receiver’s DR sends a PIM prune message to the RP router to stop duplicate packets from being sent through the RPT. In turn, the RP router stops sending multicast packets to the receiver’s DR, and sends a PIM prune message for this source over the RPT toward the source DR to halt multicast packet delivery to the RP router from that particular source.
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