ANS-C01 Network Design Practice Question
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?
⚠ Common exam trap
Many candidates assume VPC peering or VPN can handle multicast because they support general IP routing, but AWS explicitly blocks multicast and broadcast traffic on these connections, making Transit Gateway the only viable option.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AWS Transit Gateway with multicast domain.
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.
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 Transit Gateway with multicast domain.
Why this is correct
Transit Gateway supports multicast domains for forwarding multicast traffic.
- ✗
VPC peering connections between all instance subnets.
Why it's wrong here
VPC peering does not support multicast traffic.
- ✗
Application Load Balancer with UDP listener.
Why it's wrong here
ALB only supports HTTP/HTTPS and does not support multicast.
- ✗
AWS Site-to-Site VPN connections with multicast routing enabled.
Why it's wrong here
Site-to-Site VPN does not support multicast by default.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.