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Exam 300-420 topic 1 question 128 discussion

Actual exam question from Cisco's 300-420
Question #: 128
Topic #: 1
[All 300-420 Questions]

An engineer is designing a multicast network for a financial application. Most of the multicast sources also receive multicast traffic (many-to-many deployment model). To better scale routing tables, the design must not use source trees. Which multicast protocol satisfies these requirements?

  • A. PIM-SSM
  • B. PIM-SM
  • C. MSDP
  • D. BIDIR-PIM
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Suggested Answer: D 🗳️
by goku2020 at Dec. 1, 2020, 8:21 a.m.

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goku2020
Highly Voted 2 years, 6 months ago
D => BIDIR PIM is a many-to-many multicast model.
upvoted 12 times
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Eards
Most Recent 8 months, 1 week ago
Selected Answer: D
D may to many bidirectional
upvoted 1 times
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namibdigger
10 months, 3 weeks ago
Selected Answer: D
BIDIR-PIM: same tree for receiving and sending Multicast traffic & less stae in routers because many sources produce a single (*,G) only - examples: stock exchange. These meet the requirements best.
upvoted 1 times
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Hope66
1 year, 2 months ago
In many-to-many applications, PM-SM is not ideal because in not bidirectional Answer id D
upvoted 2 times
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roganjosh
1 year, 3 months ago
Selected Answer: D
Answer is D
upvoted 3 times
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Xavi07
1 year, 11 months ago
Bidir-PIM is designed to be used for many-to-many applications within individual PIM domains. Multicast groups in bidirectional PIM mode can scale to an arbitrary number of sources without incurring overhead due to the number of sources. So answer is D -> BIDIR PIM
upvoted 3 times
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[Removed]
2 years, 3 months ago
bidir. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_pim/configuration/xe-16/imc-pim-xe-16-book/imc-tech-oview.html
upvoted 2 times
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luisjuradoledesma
2 years, 4 months ago
In support of the use of BIDIR-PIM in financial applications: https://www.cisco.com/c/dam/en/us/products/collateral/ios-nx-os-software/multicast-enterprise/prod_white_paper0900aecd80310db2.pdf
upvoted 4 times
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luisjuradoledesma
2 years, 4 months ago
D - Actually PIM-SM creates shared trees (not source trees). However, BDIR-PIM eliminates the need for a first-hop route to encapsulate data packets being sent to the RP - then scales better in a "many-to-many" deployment
upvoted 2 times
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lygris
2 years, 5 months ago
D- Bidir PIM Bidir PIM doesn't build source trees, PIM-SM does
upvoted 2 times
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helium
2 years, 6 months ago
PIM-SM is correct. As there is two requirements that use Many-to-many model and no source tree. BIDIR PIM use source tree.
upvoted 1 times
Kakat
1 year, 10 months ago
https://www.cisco.com/c/dam/en/us/products/collateral/ios-nx-os-software/multicast-enterprise/prod_white_paper0900aecd80310db2.pdf BIDIR PIM uses shared tree.
upvoted 4 times
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