The answer is three AWS services or features: VPC multicast groups using network interfaces, AWS Transit Gateway with multicast domains, and AWS Direct Connect for extending on-premises multicast. This is correct because multicast traffic requires a shared delivery tree that replicates packets to multiple receivers, and within a VPC, native multicast is not supported by default; instead, you must explicitly configure multicast groups on network interfaces, use Transit Gateway’s dedicated multicast domains to route traffic across VPCs, or leverage Direct Connect to bridge on-premises multicast sources into the cloud. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding of the nuanced multicast limitations in VPCs—common traps include assuming Internet Gateway or VPC Peering support multicast, which they do not, as both operate at Layer 3 without multicast forwarding. Remember the mnemonic “TVD” for Transit Gateway, VPC interfaces, and Direct Connect to recall the three supported paths for multicast in AWS.
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. 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 uses multicast for service discovery. Which THREE AWS services or features can be used to support multicast traffic within a VPC?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AWS Direct Connect with multicast
Options B, C, and D are correct. AWS Transit Gateway supports multicast domains for multicast traffic. VPC has limited multicast support via network interfaces, and AWS PrivateLink does not. Direct Connect can extend on-premises multicast. Option A is incorrect because Internet Gateway does not support multicast. Option E is incorrect because VPC Peering does not support multicast.
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.
✓
AWS Direct Connect with multicast
Why this is correct
Direct Connect can extend on-premises multicast to AWS.
Related concept
Read the scenario before looking for a memorised answer.
✓
AWS Transit Gateway with multicast domain
Why this is correct
Transit Gateway supports multicast for inter-VPC communication.
Related concept
Read the scenario before looking for a memorised answer.
✓
VPC multicast groups using network interfaces
Why this is correct
EC2 instances can join multicast groups via network interfaces.
Related concept
Read the scenario before looking for a memorised answer.
✗
Internet Gateway (IGW)
Why it's wrong here
IGW does not support multicast.
✗
VPC Peering
Why it's wrong here
VPC Peering does not support multicast.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS Direct Connect with multicast — Options B, C, and D are correct. AWS Transit Gateway supports multicast domains for multicast traffic. VPC has limited multicast support via network interfaces, and AWS PrivateLink does not. Direct Connect can extend on-premises multicast. Option A is incorrect because Internet Gateway does not support multicast. Option E is incorrect because VPC Peering does not support multicast.
What should I do if I get this ANS-C01 question wrong?
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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 on-premises application to AWS. The application requires multicast traffic between instances within a VPC. The network engineer must design a solution that supports multicast without modifying the application. Which AWS service or feature should be used?
hard
✓ A.AWS Transit Gateway with multicast domain.
B.VPC peering connections between all instance subnets.
C.Application Load Balancer with UDP listener.
D.AWS Site-to-Site VPN connections with multicast routing enabled.
Why A: AWS Transit Gateway supports multicast through the creation of a multicast domain, which allows multicast traffic to flow between instances in different subnets within the same VPC or across attached VPCs without modifying the application. This is the only native AWS service that provides multicast forwarding, making it the correct choice for this requirement.
Variation 2. A company is migrating a legacy application to AWS. The application requires multicast traffic between EC2 instances in the same VPC. Which TWO AWS services can support this requirement? (Choose TWO.)
medium
✓ A.AWS VPC Lattice
B.Network Load Balancer (NLB)
C.Application Load Balancer (ALB)
D.Gateway Load Balancer (GWLB)
✓ E.AWS Transit Gateway multicast domain
Why A: Options B and D are correct. B: VPC Lattice supports multicast. D: Transit Gateway with multicast domain supports multicast. Option A is incorrect because a Network Load Balancer does not support multicast. Option C is incorrect because a Gateway Load Balancer does not support multicast. Option E is incorrect because Application Load Balancer does not support multicast.
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.