The answer is AWS Transit Gateway with a multicast domain, a VPC with a single subnet and multicast enabled, and a third-party virtual appliance configured for multicast routing. These three options support multicast in AWS VPC because Transit Gateway natively supports multicast through a multicast domain, allowing EC2 instances across attached VPCs and subnets to send and receive multicast traffic without third-party workarounds. A single-subnet VPC with multicast enabled works because all instances reside in the same broadcast domain, while a third-party appliance can bridge multicast traffic by acting as a multicast router within the VPC. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding of native versus overlay multicast solutions—a common trap is assuming AWS VPCs natively support multicast at the subnet level, but only Transit Gateway provides a managed multicast service across subnets. Remember the mnemonic: “TGM” for Transit Gateway, Group membership, and Multicast domain—the three pillars of native AWS multicast.
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is migrating a legacy application to AWS. The application requires multicast communication between EC2 instances in the same VPC. Which THREE options can support this requirement? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS Transit Gateway with a multicast domain.
AWS Transit Gateway supports multicast through the creation of a multicast domain, which allows EC2 instances in different subnets and VPCs attached to the transit gateway to send and receive multicast traffic. This is a native AWS capability that does not require third-party appliances or workarounds, making it a valid option for the requirement.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Use AWS Transit Gateway with a multicast domain.
Why this is correct
Transit Gateway supports multicast groups and domains.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use AWS Direct Connect to extend the on-premises multicast domain to the VPC.
Why it's wrong here
Direct Connect does not support multicast across the connection.
✓
Deploy a multicast-capable third-party virtual appliance in the VPC and configure multicast routing.
Why this is correct
Third-party appliances can be used to support multicast within a VPC.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use a VPC with a single subnet and enable multicast on the subnet.
Why this is correct
AWS supports multicast within the same VPC when using a single subnet and enabling multicast on the subnet.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a VPC peering connection and enable multicast across the peered VPCs.
Why it's wrong here
VPC peering does not support multicast.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume VPC peering or Direct Connect can carry multicast traffic because they support other Layer 3 protocols, but AWS explicitly blocks multicast and broadcast on these connections.
Detailed technical explanation
How to think about this question
AWS Transit Gateway multicast uses IGMP (Internet Group Management Protocol) for group membership management, allowing EC2 instances to dynamically join or leave multicast groups. The multicast domain is scoped to a single transit gateway, and sources and receivers must be in the same domain; cross-region multicast is not supported. In contrast, third-party virtual appliances (Option C) can be deployed as EC2 instances running multicast routing software (e.g., PIM-SM) to bridge multicast traffic within a VPC, but this adds complexity and cost.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use AWS Transit Gateway with a multicast domain. — AWS Transit Gateway supports multicast through the creation of a multicast domain, which allows EC2 instances in different subnets and VPCs attached to the transit gateway to send and receive multicast traffic. This is a native AWS capability that does not require third-party appliances or workarounds, making it a valid option for the requirement.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is migrating a legacy application to AWS. The application requires multicast communication between instances. The company needs to implement a multicast solution within a VPC. Which AWS service or feature should be used to support multicast?
hard
✓ A.Create a Transit Gateway multicast domain
B.Configure multicast in the VPC's route tables
C.Use AWS Global Accelerator for multicast distribution
D.Set up VPC peering to enable multicast between subnets
Why A: Option D is correct because AWS Transit Gateway supports multicast groups. Option A is incorrect because VPC does not natively support multicast. Option B is incorrect because AWS Global Accelerator is for anycast, not multicast. Option C is incorrect because VPC peering does not support multicast.
Variation 2. A company is migrating an on-premises application to AWS. The application uses multicast for discovery. Which AWS service supports multicast traffic within a VPC?
medium
✓ A.AWS Transit Gateway
B.VPC peering
C.Application Load Balancer
D.Amazon CloudFront
Why A: Option B is correct because AWS Transit Gateway supports multicast routing. Option A is wrong because VPC peering does not support multicast. Option C is wrong because Application Load Balancer is layer 7, not multicast. Option D is wrong because CloudFront is for content delivery, not multicast within VPC.
Variation 3. A company is migrating a legacy application to AWS. The application requires multicast traffic between EC2 instances. Which AWS service can support multicast within a VPC?
easy
A.VPC native multicast
B.Amazon CloudFront
C.Application Load Balancer
✓ D.Transit Gateway with multicast domain
Why D: AWS Transit Gateway supports multicast traffic through the creation of a multicast domain, which allows EC2 instances in different VPCs or subnets to send and receive multicast traffic. This is the only native AWS service that supports multicast within a VPC environment, making it the correct choice for migrating a legacy application that requires multicast.
Variation 4. A company is migrating a legacy application to AWS. The application uses multicast traffic between servers. The company needs to support multicast in the AWS VPC. Which TWO solutions can the network engineer recommend? (Choose TWO.)
hard
✓ A.Deploy a third-party virtual firewall or router that supports multicast inside the VPC.
B.Use VPC endpoints for multicast support.
C.Use VPC peering connections to allow multicast traffic between VPCs.
✓ D.Use a transit gateway with multicast domain configuration.
E.Use AWS Direct Connect to extend the on-premises multicast domain.
Why A: Options A and D are correct. Option A uses a transit gateway with multicast support. Option D uses a third-party virtual appliance to handle multicast. Option B is wrong because VPC peering does not support multicast. Option C is wrong because Direct Connect does not provide multicast. Option E is wrong because VPC endpoints do not support multicast.
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Question Discussion
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