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Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 40 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 40
Topic #: 1
[All AWS Certified Advanced Networking - Specialty ANS-C01 Questions]

A company is deploying a new application on AWS. The application uses dynamic multicasting. The company has five VPCs that are all attached to a transit gateway Amazon EC2 instances in each VPC need to be able to register dynamically to receive a multicast transmission.
How should a network engineer configure the AWS resources to meet these requirements?

  • A. Create a static source multicast domain within the transit gateway. Associate the VPCs and applicable subnets with the multicast domain. Register the multicast senders' network interface with the multicast domain. Adjust the network ACLs to allow UDP traffic from the source to all receivers and to allow UDP traffic that is sent to the multicast group address.
  • B. Create a static source multicast domain within the transit gateway. Associate the VPCs and applicable subnets with the multicast domain. Register the multicast senders' network interface with the multicast domain. Adjust the network ACLs to allow TCP traffic from the source to all receivers and to allow TCP traffic that is sent to the multicast group address.
  • C. Create an Internet Group Management Protocol (IGMP) multicast domain within the transit gateway. Associate the VPCs and applicable subnets with the multicast domain. Register the multicast senders' network interface with the multicast domain. Adjust the network ACLs to allow UDP traffic from the source to all receivers and to allow UDP traffic that is sent to the multicast group address.
  • D. Create an Internet Group Management Protocol (IGMP) multicast domain within the transit gateway. Associate the VPCs and applicable subnets with the multicast domain. Register the multicast senders' network interface with the multicast domain. Adjust the network ACLs to allow TCP traffic from the source to all receivers and to allow TCP traffic that is sent to the multicast group address.
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Suggested Answer: C 🗳️
by zaazanuna at March 18, 2023, 11:48 p.m.
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ITgeek
Highly Voted 1 year, 8 months ago
Selected Answer: C
C for UDP not TCP
upvoted 7 times
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Raphaello
Most Recent 8 months, 3 weeks ago
Selected Answer: C
Multicast is a connectionless UDP-based transport, and dynamic group membership is through IGMP. C is the correct answer.
upvoted 2 times
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vikasj1in
10 months, 1 week ago
Selected Answer: C
Using IGMP (Internet Group Management Protocol) is a common approach for dynamic multicasting. It allows hosts to report their multicast group memberships to any neighboring multicast routers, which in this case is the transit gateway. Creating an IGMP multicast domain within the transit gateway helps organize and manage the multicast traffic. Associating the VPCs and applicable subnets with the multicast domain ensures that the multicast traffic is properly routed within the transit gateway. Registering the multicast senders' network interface with the multicast domain allows them to dynamically join the multicast group. Adjusting the network ACLs to allow UDP traffic from the source to all receivers and to allow UDP traffic that is sent to the multicast group address ensures proper communication between multicast senders and receivers.
upvoted 1 times
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marfee
10 months, 2 weeks ago
I think that it's correcty answer is C.
upvoted 1 times
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Arad
1 year, 1 month ago
Selected Answer: C
Correct answer is C.
upvoted 1 times
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Alabi
1 year, 3 months ago
Selected Answer: C
C for sure
upvoted 1 times
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sdey0008
1 year, 6 months ago
IGMP+UDP
upvoted 4 times
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joeyjones
1 year, 7 months ago
https://docs.aws.amazon.com/vpc/latest/tgw/how-multicast-works.html https://docs.aws.amazon.com/vpc/latest/tgw/working-with-multicast.html#multicast-configurations-igmp
upvoted 2 times
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ohcan
1 year, 8 months ago
C. I doubt with A, but as it requires "dynamic" multicast then C is better.
upvoted 3 times
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study_aws1
1 year, 9 months ago
Yes C is correct
upvoted 2 times
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helloworldabc
1 year, 9 months ago
CCCCCCCC
upvoted 2 times
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zaazanuna
1 year, 9 months ago
C - correct.
upvoted 3 times
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