The correct answer is to launch EC2 instances in at least two Availability Zones and deploy a NAT Gateway in each Availability Zone. This configuration ensures that if an entire AZ fails, your application’s compute layer remains operational in the surviving AZ, while each private subnet retains a local, resilient path to the internet via its own NAT Gateway—avoiding costly cross-AZ data transfer and single points of failure. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this question tests your understanding of high availability VPC design with multi-AZ NAT Gateways, specifically the principle that fault tolerance requires redundancy at both the compute and network edge layers. A common trap is assuming a single NAT Gateway in one AZ suffices, but that creates a dependency on that AZ’s health. Memory tip: “Two AZs, two NATs—no single point of failure, no cross-AZ data rates.”
SOA-C02 Networking and Content Delivery Practice Question
This SOA-C02 practice question tests your understanding of networking and content delivery. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 SysOps administrator is planning a VPC design with high availability for an application that must tolerate the failure of an entire Availability Zone. Which TWO configurations should be implemented? (Select TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy a NAT Gateway in each Availability Zone.
Option B is correct because deploying a NATGateway in each Availability Zone ensures that private subnets in each AZ have a route to the internet via a NAT Gateway that resides in the same AZ, preventing cross-AZ data transfer costs and maintaining high availability if an entire AZ fails. Option C is correct because launching EC2 instances in at least two Availability Zones provides fault tolerance at the compute layer, allowing the application to continue serving traffic even if one AZ becomes unavailable.
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.
Provides AZ-level redundancy for outbound traffic.
Related concept
Read the scenario before looking for a memorised answer.
✓
Launch EC2 instances in at least two Availability Zones.
Why this is correct
Spreading across AZs provides high availability.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a placement group to ensure instances are in different AZs.
Why it's wrong here
Placement groups spread across AZs but do not guarantee high availability by themselves.
✗
Use only one public subnet and one private subnet.
Why it's wrong here
Single subnet per AZ is not redundant across AZs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think a single NATGateway is sufficient for high availability because it is a managed service, but they overlook that it is still tied to a single AZ and will fail if that AZ fails, making per-AZ deployment essential for AZ-level fault tolerance.
Detailed technical explanation
How to think about this question
NAT Gateways are highly available within their own Availability Zone, but they are not resilient to AZ failures unless you deploy one per AZ and configure separate route tables for each private subnet to point to its local NAT Gateway. EC2 instances in different AZs can be fronted by an Application Load Balancer (ALB) with cross-zone load balancing enabled, which automatically distributes traffic to healthy instances across AZs, ensuring seamless failover when an AZ goes down.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Networking and Content Delivery — This question tests Networking and Content Delivery — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy a NAT Gateway in each Availability Zone. — Option B is correct because deploying a NAT Gateway in each Availability Zone ensures that private subnets in each AZ have a route to the internet via a NAT Gateway that resides in the same AZ, preventing cross-AZ data transfer costs and maintaining high availability if an entire AZ fails. Option C is correct because launching EC2 instances in at least two Availability Zones provides fault tolerance at the compute layer, allowing the application to continue serving traffic even if one AZ becomes unavailable.
What should I do if I get this SOA-C02 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.
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Question Discussion
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