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 traffic between EC2 instances. Which AWS service can support multicast within a VPC?
VPC native multicast
Why wrong: VPC does not support multicast natively.
Amazon CloudFront
Why wrong: CloudFront is for CDN.
Application Load Balancer
Why wrong: ALB does not support multicast.
Transit Gateway with multicast domain
Transit Gateway supports multicast.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Transit Gateway with multicast domain
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
VPC native multicast
Why it's wrong here
VPC does not support multicast natively.
Amazon CloudFront
Why it's wrong here
CloudFront is for CDN.
Application Load Balancer
Why it's wrong here
ALB does not support multicast.
Transit Gateway with multicast domain
Why this is correct
Transit Gateway supports multicast.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates may assume 'VPC native multicast' exists because of the term 'native' or confuse multicast with broadcast or unicast features, but AWS VPC does not support multicast natively, and Transit Gateway is the required service.
Detailed technical explanation
Transit Gateway multicast uses IGMP (Internet Group Management Protocol) for group membership management, allowing EC2 instances to join or leave multicast groups dynamically. The multicast domain is configured with a static or IGMP-based membership, and traffic is replicated at the Transit Gateway level, which can span multiple VPCs and on-premises networks via VPN or Direct Connect. This is critical for applications like media streaming, financial trading platforms, or industrial control systems that rely on multicast for efficient one-to-many communication.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
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FAQ
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
The correct answer is: Transit Gateway with multicast domain — 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.
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