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Exam HPE6-A73 topic 1 question 47 discussion

Actual exam question from HP's HPE6-A73
Question #: 47
Topic #: 1
[All HPE6-A73 Questions]

How does PIM build the IP multicast routing table to route traffic between a multicast source and one or more receivers?

  • A. It uses the unicast routing table and reverse path forwarding (RPF)
  • B. It uses IGMP and calculates a shortest path tree (SPT)
  • C. It uses the shortest path first (SPF) algorithm derived from link state protocols
  • D. It uses the Bellman-Ford algorithm derived from distance vector protocols
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Suggested Answer: A 🗳️

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cloud29
Highly Voted 3 years ago
Answer is A "PIM also relies on the unicast routing tables to identify the path back to a multicast source. This routing method is known as reverse path forwarding (RPF). The unicast routing protocols create the unicast routing tables. With this information, PIM sets up the distribution tree for the multicast traffic.
upvoted 8 times
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AM1234
Highly Voted 2 years, 10 months ago
The Correct Answer is A
upvoted 5 times
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SeidorBruno
Most Recent 9 months, 3 weeks ago
Selected Answer: A
Page 618 Study Guide: Each router in the network must calculate the tree independently based on the information it has received, whether by dynamic protocol updates (PIM), or by configuration. Using Reverse Path Forwarding (RPF), the router checks for loops and creates the Outgoing Interface List (OIL) from the best (sometimes called shortest) paths from the unicast routing table. For this reason, a source tree is also called a shortest path tree. [Aruba Networks]
upvoted 3 times
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E_Nick
1 year, 6 months ago
Selected Answer: A
The Correct Answer is A
upvoted 1 times
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