- A
Create an AWS Transit Gateway and attach both VPCs to it. Configure route tables to allow communication.
Why wrong: Transit Gateway solves the problem but introduces additional complexity and cost (hourly charge per attachment). For only two VPCs, VPC Peering is simpler and more cost-effective.
- B
Create a VPC Peering connection between VPC-A and VPC-B. Update the route tables in each VPC to add routes to the other VPC's CIDR.
VPC Peering provides direct, private connectivity between two VPCs. It is highly available by nature and supports cross-account connections. Route tables must be updated to enable traffic flow.
- C
Attach an internet gateway to each VPC and use Amazon Route 53 to resolve private DNS names over the internet.
Why wrong: Using internet gateways routes traffic over the public internet, not private IP addresses. This would expose traffic to the internet and incur data transfer costs, violating the requirement for private IP communication.
- D
Set up a site-to-site VPN connection between the two VPCs using AWS Virtual Private Gateway.
Why wrong: Site-to-site VPN connections require a VPN endpoint in each VPC and are designed for on-premises connectivity. Using it for VPC-to-VPC is overly complex and not as reliable as VPC Peering.
Quick Answer
The answer is to create a VPC Peering connection between VPC-A and VPC-B, then update the route tables in each VPC to add routes to the other VPC’s CIDR block. This is correct because VPC Peering establishes direct, private IP connectivity using the AWS global network, eliminating bandwidth bottlenecks and single points of failure without requiring a third-party appliance. For the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of native VPC interconnection methods—specifically that VPC Peering is the simplest, highly available solution for connecting two VPCs in the same account and Region, provided their CIDRs do not overlap. A common trap is choosing a VPN or Transit Gateway, but those add unnecessary complexity or cost when a direct peering connection suffices. Remember the memory tip: “Peer first, route second”—always establish the peering connection before updating route tables, and ensure both route tables point to the peering ID as the target for the other VPC’s CIDR.
SOA-C02 Networking and Content Delivery 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: vPC Peering enables private IP communication between two VPCs.. 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 two VPCs in the same AWS account and Region: VPC-A (10.0.0.0/16) and VPC-B (10.1.0.0/16). The SysOps administrator needs to establish connectivity between these VPCs so that resources in VPC-A can reach resources in VPC-B using private IP addresses. The solution must be highly available and not involve a third-party appliance. Which solution should the administrator implement?
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
Create a VPC Peering connection between VPC-A and VPC-B. Update the route tables in each VPC to add routes to the other VPC's CIDR.
Option B is correct because VPC Peering provides direct, private IP connectivity between two VPCs using the AWS global network, with no bandwidth bottleneck or single point of failure. By creating a peering connection and adding routes to the other VPC's CIDR in each VPC's route table, resources can communicate privately and the solution is highly available as the peering connection itself is redundant within AWS's infrastructure. No third-party appliance is required, and the setup is fully managed by AWS.
Key principle: VPC Peering enables private IP communication between two VPCs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create an AWS Transit Gateway and attach both VPCs to it. Configure route tables to allow communication.
Why it's wrong here
Transit Gateway solves the problem but introduces additional complexity and cost (hourly charge per attachment). For only two VPCs, VPC Peering is simpler and more cost-effective.
- ✓
Create a VPC Peering connection between VPC-A and VPC-B. Update the route tables in each VPC to add routes to the other VPC's CIDR.
Why this is correct
VPC Peering provides direct, private connectivity between two VPCs. It is highly available by nature and supports cross-account connections. Route tables must be updated to enable traffic flow.
Related concept
VPC Peering enables private IP communication between two VPCs.
- ✗
Attach an internet gateway to each VPC and use Amazon Route 53 to resolve private DNS names over the internet.
Why it's wrong here
Using internet gateways routes traffic over the public internet, not private IP addresses. This would expose traffic to the internet and incur data transfer costs, violating the requirement for private IP communication.
- ✗
Set up a site-to-site VPN connection between the two VPCs using AWS Virtual Private Gateway.
Why it's wrong here
Site-to-site VPN connections require a VPN endpoint in each VPC and are designed for on-premises connectivity. Using it for VPC-to-VPC is overly complex and not as reliable as VPC Peering.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often overcomplicate the solution by choosing Transit Gateway (Option A) for high availability, forgetting that VPC Peering is inherently highly available within a region and is the simplest, most cost-effective option for connecting just two VPCs.
Detailed technical explanation
How to think about this question
VPC Peering uses the AWS global backbone to route traffic between VPCs, ensuring low latency and high throughput without traversing the public internet. The peering connection is not a transitive gateway; each pair of VPCs requires a separate peering connection, and route tables must be explicitly updated with the peer VPC's CIDR. Under the hood, AWS uses BGP-like logic to propagate routes within the VPC, but the peering connection itself is a logical link that leverages AWS's internal infrastructure for redundancy.
KKey Concepts to Remember
- VPC Peering enables private IP communication between two VPCs.
- Traffic over a VPC Peering connection stays within the AWS network.
- Route tables in both VPCs must be updated for traffic flow.
- VPC Peering is highly available and supports cross-account connections.
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
VPC Peering enables private IP communication between two VPCs.
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.
Review vPC Peering enables private IP communication between two VPCs., 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 — VPC Peering enables private IP communication between two VPCs..
What is the correct answer to this question?
The correct answer is: Create a VPC Peering connection between VPC-A and VPC-B. Update the route tables in each VPC to add routes to the other VPC's CIDR. — Option B is correct because VPC Peering provides direct, private IP connectivity between two VPCs using the AWS global network, with no bandwidth bottleneck or single point of failure. By creating a peering connection and adding routes to the other VPC's CIDR in each VPC's route table, resources can communicate privately and the solution is highly available as the peering connection itself is redundant within AWS's infrastructure. No third-party appliance is required, and the setup is fully managed by AWS.
What should I do if I get this SOA-C02 question wrong?
Review vPC Peering enables private IP communication between two VPCs., then practise related SOA-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
VPC Peering enables private IP communication between two VPCs.
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Last reviewed: Jun 11, 2026
This SOA-C02 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 SOA-C02 exam.
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