ANS-C01 Multicast Practice Question
A company is migrating a legacy application to AWS. The application requires multicast traffic between EC2 instances in the same VPC. Which AWS service can support this requirement?
⚠ Common exam trap
A common trap is assuming that VPC Lattice supports multicast because it handles service-to-service communication, but it only supports unicast. Another trap is thinking that load balancers can handle multicast. Only Transit Gateway multicast domains provide native multicast support in AWS.
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 multicast domain
AWS Transit Gateway multicast domains are the only native AWS service that supports multicast traffic between EC2 instances within a VPC. AWS VPC Lattice does not support multicast; it provides service-to-service connectivity using HTTP/HTTPS and TCP. NLB, ALB, and GWLB are load balancers that distribute traffic but do not support multicast.
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 VPC Lattice
Why it's wrong here
Incorrect. AWS VPC Lattice does not support multicast traffic; it only handles unicast service-to-service communication.
- ✗
Network Load Balancer (NLB)
Why it's wrong here
Incorrect. Network Load Balancer distributes TCP/UDP traffic but does not support multicast protocols.
- ✗
Application Load Balancer (ALB)
Why it's wrong here
Incorrect. Application Load Balancer works at Layer 7 and does not support multicast.
- ✗
Gateway Load Balancer (GWLB)
Why it's wrong here
Incorrect. Gateway Load Balancer is for transparent inspection appliances and does not support multicast.
- ✓
AWS Transit Gateway multicast domain
Why this is correct
Correct. AWS Transit Gateway multicast domains allow multicast traffic between EC2 instances in the same VPC or across attached VPCs.
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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.