- A
Deploy a third-party virtual firewall or router that supports multicast inside the VPC.
Virtual appliances can handle multicast routing.
- B
Use VPC endpoints for multicast support.
Why wrong: VPC endpoints are for accessing services privately, not multicast.
- C
Use VPC peering connections to allow multicast traffic between VPCs.
Why wrong: VPC peering does not support multicast or broadcast.
- D
Use a transit gateway with multicast domain configuration.
Transit gateway supports multicast in a domain.
- E
Use AWS Direct Connect to extend the on-premises multicast domain.
Why wrong: Direct Connect is a physical connection; it does not natively support multicast.
Question 894 of 1,705
AWS Solutions for Multicast Traffic Within a VPC
This ANS-C01 practice question tests your understanding of network implementation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 traffic between servers. The company needs to support multicast in the AWS VPC. Which TWO solutions can the network engineer recommend? (Choose TWO.)
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
✓
Deploy a third-party virtual firewall or router that supports multicast inside the VPC.
Option A is correct because a third-party virtual firewall or router appliance (e.g., from vendors like Palo Alto Networks or Cisco) can be deployed in the VPC and configured to forward multicast traffic using protocols such as IGMP and PIM. This allows the legacy application to continue using multicast within the VPC without native AWS multicast support. Option D is correct because AWS Transit Gateway now supports multicast domains, enabling you to create a multicast group and associate subnets, allowing multicast traffic to flow between attached VPCs and VPN connections.
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.
- ✓
Deploy a third-party virtual firewall or router that supports multicast inside the VPC.
Why this is correct
Virtual appliances can handle multicast routing.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use VPC endpoints for multicast support.
Why it's wrong here
VPC endpoints are for accessing services privately, not multicast.
- ✗
Use VPC peering connections to allow multicast traffic between VPCs.
Why it's wrong here
VPC peering does not support multicast or broadcast.
- ✓
Use a transit gateway with multicast domain configuration.
Why this is correct
Transit gateway supports multicast in a domain.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use AWS Direct Connect to extend the on-premises multicast domain.
Why it's wrong here
Direct Connect is a physical connection; it does not natively support multicast.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume VPC peering or Direct Connect can carry multicast traffic, but AWS explicitly blocks multicast and broadcast at the hypervisor level, so only Transit Gateway multicast domains or third-party appliances can solve this requirement.
Detailed technical explanation
How to think about this question
Multicast in AWS VPCs is not natively supported by default; however, Transit Gateway multicast domains use IGMPv2 to manage group memberships and can forward multicast traffic between attached VPCs and VPNs. When deploying a third-party virtual appliance, it must be placed in a subnet with source/destination check disabled and configured with PIM-SM or PIM-DM to route multicast traffic, which adds complexity but provides flexibility for legacy applications.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Visual reference
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
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: Deploy a third-party virtual firewall or router that supports multicast inside the VPC. — Option A is correct because a third-party virtual firewall or router appliance (e.g., from vendors like Palo Alto Networks or Cisco) can be deployed in the VPC and configured to forward multicast traffic using protocols such as IGMP and PIM. This allows the legacy application to continue using multicast within the VPC without native AWS multicast support. Option D is correct because AWS Transit Gateway now supports multicast domains, enabling you to create a multicast group and associate subnets, allowing multicast traffic to flow between attached VPCs and VPN connections.
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
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Same concept, more angles
5 more ways this is tested on ANS-C01
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 EC2 instances in the same VPC. Which THREE options can support this requirement? (Choose three.)
medium- ✓ A.Use AWS Transit Gateway with a multicast domain.
- B.Use AWS Direct Connect to extend the on-premises multicast domain to the VPC.
- ✓ C.Deploy a multicast-capable third-party virtual appliance in the VPC and configure multicast routing.
- D.Use a VPC with a single subnet and enable multicast on the subnet.
- E.Create a VPC peering connection and enable multicast across the peered VPCs.
Why A: AWS Transit Gateway supports multicast through dedicated multicast domains, allowing EC2 instances in attached subnets and VPCs to participate in multicast groups. This is a native AWS capability. Additionally, deploying a third-party virtual appliance that supports multicast routing in the VPC enables multicast traffic forwarding. However, AWS VPCs do not natively support multicast traffic, even within a single subnet, so option D is not valid. Direct Connect and VPC peering also do not support multicast due to AWS network restrictions.
Variation 2. 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: AWS Transit Gateway supports multicast through the creation of a Transit Gateway multicast domain. This feature allows you to send multicast traffic from a source to multiple receivers within a VPC, which is required for legacy applications that rely on multicast communication. Transit Gateway multicast domains work with IGMP (Internet Group Management Protocol) to manage group memberships and route multicast traffic efficiently.
Variation 3. 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: AWS Transit Gateway supports multicast traffic within a VPC by acting as a multicast router. It allows you to create multicast domains and associate subnets, enabling multicast group communication (using IGMP) for applications like service discovery. This makes it the correct choice for migrating an on-premises application that relies on multicast.
Variation 4. A company is implementing a multicast application in AWS. The application requires that multicast traffic be forwarded between Amazon EC2 instances in different VPCs. The company has set up a multicast domain using AWS Transit Gateway Connect with multicast support. The multicast group is using the IP address 239.0.1.10. The network engineer has confirmed that the EC2 instances are registered as multicast members and that the Transit Gateway multicast domain is configured correctly. However, receivers in VPC B are not receiving multicast traffic from senders in VPC A. What is the MOST likely cause of this issue?
hard- A.The multicast group is not associated with the correct subnet in VPC A.
- B.The multicast traffic has a TTL value of 1, which prevents it from leaving the source subnet.
- ✓ C.The security group for the sender EC2 instances does not allow outbound UDP traffic to the multicast group address.
- D.The receiver instances are not sending IGMP join messages to the multicast group.
Why C: The issue is that the sender EC2 instances' security group must allow outbound UDP traffic to the multicast group address 239.0.1.10. Even though the Transit Gateway multicast domain is correctly configured, security groups act as a virtual firewall at the instance level and can block multicast traffic if the appropriate outbound rule is not present. Option C is correct because without this rule, the traffic is blocked at the source. Option A is incorrect because multicast groups are not tied to specific subnets; they are associated with the transit gateway. Option B is incorrect because TTL is not a limiting factor in this scenario; AWS Transit Gateway multicast handles traffic within the domain regardless of TTL. Option D is incorrect because IGMP join messages are not required; multicast group members are statically registered in the Transit Gateway multicast domain.
Variation 5. 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.
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Last reviewed: Jul 4, 2026
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