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Exam HPE6-A73 topic 1 question 15 discussion

Actual exam question from HP's HPE6-A73
Question #: 15
Topic #: 1
[All HPE6-A73 Questions]

A network administrator is managing a network that deploys a multicast service. The administrator has multiple streams successfully being routed by PIM-DM in the network. The administrator then adds a new stream with a destination address of 239.0.0.1. However, clients who have not joined the stream are receiving it.
What should the administrator do to fix this problem?

  • A. Verify that IGMP is enabled between the switches connecting the multicast source and receivers
  • B. Change the destination multicast address to 239.1.1.1
  • C. Define the 239.0.0.1 stream on the rendezvous point (RP)
  • D. Define the 239.0.0.1 stream on the PIM candidate bootstrap router
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by poris27 at April 2, 2021, 2:24 a.m.

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johnhenri
1 month, 3 weeks ago
Selected Answer: B
Ebook ACSP Chapter IGMP - Multicast adressing - Overlapping adress issues: "Because only 23 bits of the 28 bits address are carried from the L3 to the L2 multicast adress, you will over some layer-3 multicast adress share the same L2 multicast adress. You should AVOID this situation. Basically, multicast adresses that include x.0.0.x and x.128.0.x will overlap. Multicast adresses in the 224.0.0.0/24 range are link local multicast adresses. They are used for protocol discovery and are flooded to every port... For a switch that is doing IGMP snooping, these are NOT added to the snooping list and thus are not filtered. Therefor, if you would use an IP adresse like 239.0.0.1, IGMP snooping would not filter its corresponding L2 multicast adress, thinking that this was an IGMP-related message."
upvoted 1 times
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SeidorBruno
10 months, 3 weeks ago
Selected Answer: B
Page 536 Study Guide: As a recommendation do not use x.0.0.x or x.128.0.x, since these addresses will overlay with the Link- Local Multicast address scope. [Aruba Networks]
upvoted 4 times
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Neyce
1 year, 1 month ago
B: MAC/IP overlap. 239.0.0.1 would be the same MAC for 224.0.0.1. 224.0.0.0/24 is always flooded over every port.
upvoted 1 times
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Unkn0wnProtocol2
2 years, 3 months ago
Selected Answer: B
B is coorect. MAC/IP overlap. 239.0.0.1 would be the same MAC for 224.0.0.1. 224.0.0.0/24 is always flooded over every port.
upvoted 1 times
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sentinel44
2 years, 4 months ago
Selected Answer: B
B correct. Due to MAC/IP overlap, guidelines is to not use x.0.0.x or x.128.0.x addresses.
upvoted 2 times
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Disposable_Me_2018
2 years, 8 months ago
A wrong as solution already works. C wrong as this is PIM-DM D wrong as this is PIM-DM B correct. Due to MAC/IP overlap, guidelines is to not use x.0.0.x or x.128.0.x addresses.
upvoted 4 times
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kup
2 years, 8 months ago
B correct not use x.0.0.x as destination because overlaps with linklocal - Study book
upvoted 4 times
I_C_U
2 years, 8 months ago
Which study book are you referring to and what page?
upvoted 1 times
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mgruber
2 years, 10 months ago
I think it's A. Cause without IGMP enabled on switches between the streams it will be broadcasted to all known devices/clients.
upvoted 2 times
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WifiX
3 years ago
B is correct page 252
upvoted 2 times
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poris27
3 years, 1 month ago
We should never use x.0.0.x as destination
upvoted 4 times
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cloud29
3 years, 1 month ago
Why B?
upvoted 1 times
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poris27
3 years, 1 month ago
I think the answer is B
upvoted 1 times
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