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Exam 300-430 topic 1 question 43 discussion

Actual exam question from Cisco's 300-430
Question #: 43
Topic #: 1
[All 300-430 Questions]

A network engineer needs to configure multicast in the network. The implementation will use multiple multicast groups and PIM routers. Which address provides automatic discovery of the best RP for each multicast group?

  • A. 224.0.0.13
  • B. 224.0.0.14
  • C. 224.0.1.39
  • D. 224.0.1.40
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Suggested Answer: D 🗳️

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Robesera
Highly Voted 1 year, 6 months ago
Correct. https://www.cisco.com/c/en/us/support/docs/ip/multicast/118405-config-rp-00.html#:~:text=The%20RP%20Discovery%20Messages%20destined%20to%20224.0.1.40%20contain%20the%20best%20elected%20RP%2Dto%2Dgroup%20mapping%20information%20from%20Mapping%20Agents.
upvoted 5 times
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rrahim
Most Recent 2 months, 1 week ago
Selected Answer: D
224.0.1.40 is the multicast group address used by Auto-RP (Automatic Rendezvous Point) to automatically discover and distribute RP information across the network. This simplifies the configuration of multicast networks with multiple multicast groups and PIM routers. The other options are incorrect: A. 224.0.0.13: This is used for PIMv2 Hello messages, not RP discovery. B. 224.0.0.14: This is used for the RIP (Routing Information Protocol) version 2 multicast group. C. 224.0.1.39: This is used for Cisco-RP-Announce messages in Auto-RP, but not for RP discovery itself.
upvoted 1 times
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Far3
3 months, 1 week ago
Selected Answer: D
Auto discovery so D is the correct one.
upvoted 1 times
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Markus_Kruber
8 months ago
Selected Answer: D
According to https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_pim/configuration/xe-16-5/imc-pim-xe-16-5-book/imc-basic-cfg.html D and C should be correct
upvoted 1 times
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AhcMez
9 months ago
Auto discovery so D is the correct one.
upvoted 1 times
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TJR72
11 months, 4 weeks ago
Selected Answer: A
The address that provides automatic discovery of the best RP (Rendezvous Point) for multiple multicast groups is the "Bootstrap Router (BSR)" address. The BSR address is a reserved multicast address (224.0.0.13) used by routers to exchange information about candidate RPs and multicast group-to-RP mappings in a multicast-enabled network
upvoted 1 times
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A (35%)
C (25%)
B (20%)
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