- A
Use AWS Transit Gateway with attachment route tables that isolate traffic between VPCs, ensuring that VPC A and VPC B routes are separate.
Correct. Transit Gateway allows VPCs with overlapping CIDRs to communicate by using isolated route tables per VPC attachment, meeting all requirements and scaling well.
- B
Use AWS PrivateLink by creating a Network Load Balancer in VPC C and configuring VPC endpoints in VPC A and VPC B to access the services.
Why wrong: Incorrect. PrivateLink only provides access to specific services (e.g., via NLB and VPC endpoints), not general IP communication between all resources in the VPCs. It does not fulfill the requirement of enabling private IP communication between the VPCs.
- C
Create two VPC peering connections: one between VPC A and VPC C, and one between VPC B and VPC C.
Why wrong: Incorrect. VPC peering does not support overlapping CIDR blocks, so peering between VPC A and VPC C (both using 10.0.0.0/16) would fail due to conflicts.
- D
Set up two AWS Site-to-Site VPN connections from VPC C to VPC A and VPC B using virtual private gateways.
Why wrong: Incorrect. Site-to-Site VPN is typically used for connecting on-premises networks to VPCs, not for VPC-to-VPC communication in the same region. It adds complexity and does not address overlapping CIDRs.
SOA-C02 Transit Gateway Practice Question
This SOA-C02 practice question tests your understanding of networking and content delivery. 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. A key principle to apply: transit Gateway. 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 has three VPCs in the same AWS region: VPC A (production), VPC B (development), and VPC C (shared services). The VPCs have overlapping CIDR blocks (e.g., VPC A: 10.0.0.0/16, VPC B: 10.0.0.0/16, VPC C: 10.1.0.0/16). The SysOps administrator needs to enable private IP communication between VPC A and VPC C, and between VPC B and VPC C, but not between VPC A and VPC B. The solution must also support a growing number of VPCs in the future. Which AWS service should be used?
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
Use AWS Transit Gateway with attachment route tables that isolate traffic between VPCs, ensuring that VPC A and VPC B routes are separate.
AWS Transit Gateway can handle VPCs with overlapping CIDR blocks by using separate route tables for each VPC attachment. This allows VPC A and VPC B to both communicate with VPC C while remaining isolated from each other. The service also scales easily as more VPCs are added. PrivateLink (option B) only provides access to specific services via VPC endpoints, not general private IP communication between all resources in the VPCs. VPC peering (option C) does not support overlapping CIDRs. Site-to-Site VPN (option D) is more complex and unnecessary for this use case.
Key principle: Transit Gateway
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use AWS Transit Gateway with attachment route tables that isolate traffic between VPCs, ensuring that VPC A and VPC B routes are separate.
- ✗
Use AWS PrivateLink by creating a Network Load Balancer in VPC C and configuring VPC endpoints in VPC A and VPC B to access the services.
Why it's wrong here
Incorrect. PrivateLink only provides access to specific services (e.g., via NLB and VPC endpoints), not general IP communication between all resources in the VPCs. It does not fulfill the requirement of enabling private IP communication between the VPCs.
- ✗
Create two VPC peering connections: one between VPC A and VPC C, and one between VPC B and VPC C.
Why it's wrong here
Incorrect. VPC peering does not support overlapping CIDR blocks, so peering between VPC A and VPC C (both using 10.0.0.0/16) would fail due to conflicts.
- ✗
Set up two AWS Site-to-Site VPN connections from VPC C to VPC A and VPC B using virtual private gateways.
Why it's wrong here
Incorrect. Site-to-Site VPN is typically used for connecting on-premises networks to VPCs, not for VPC-to-VPC communication in the same region. It adds complexity and does not address overlapping CIDRs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates may think that PrivateLink provides full VPC-to-VPC connectivity, but it only allows access to specific services (e.g., via NLB and VPC endpoints). For general private IP communication between VPCs, Transit Gateway is the appropriate service.
Detailed technical explanation
How to think about this question
AWS PrivateLink uses VPC endpoints (interface or Gateway Load Balancer endpoints) to privately connect VPCs to services hosted on a Network Load Balancer (NLB) in another VPC, without requiring VPC peering or transit routing. The NLB in VPC C handles traffic from VPC A and VPC B via separate endpoint connections, and because PrivateLink operates at the application layer (via DNS and ENIs), it bypasses IP-level routing conflicts caused by overlapping CIDRs. This design also scales horizontally as new VPCs can be added by creating additional VPC endpoints, making it ideal for hub-and-spoke architectures with CIDR overlap.
KKey Concepts to Remember
- Transit Gateway
- Overlapping CIDRs
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
Transit Gateway
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
What to study next
Got this wrong? Here's your next step.
Review transit Gateway, then practise related SOA-C02 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Networking and Content Delivery — This question tests Networking and Content Delivery — Transit Gateway.
What is the correct answer to this question?
The correct answer is: Use AWS Transit Gateway with attachment route tables that isolate traffic between VPCs, ensuring that VPC A and VPC B routes are separate. — AWS Transit Gateway can handle VPCs with overlapping CIDR blocks by using separate route tables for each VPC attachment. This allows VPC A and VPC B to both communicate with VPC C while remaining isolated from each other. The service also scales easily as more VPCs are added. PrivateLink (option B) only provides access to specific services via VPC endpoints, not general private IP communication between all resources in the VPCs. VPC peering (option C) does not support overlapping CIDRs. Site-to-Site VPN (option D) is more complex and unnecessary for this use case.
What should I do if I get this SOA-C02 question wrong?
Review transit Gateway, then practise related SOA-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Transit Gateway
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Last reviewed: Jun 11, 2026
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