- A
Use Amazon ECS with Fargate to run a container that processes S3 events and generates thumbnails.
Why wrong: ECS Fargate is more expensive and complex than Lambda for this use case.
- B
Upload to S3, send a message to an SQS queue, and have a Lambda function poll the queue to generate thumbnails.
Why wrong: S3 event notifications can directly invoke Lambda; adding SQS introduces unnecessary complexity.
- C
Use an Auto Scaling group of EC2 instances to poll S3 for new uploads and generate thumbnails.
Why wrong: EC2 instances run continuously, incurring cost even when idle; overscales for unpredictable traffic.
- D
Configure S3 event notifications to invoke a Lambda function directly upon upload to generate thumbnails.
Lambda is serverless, scales automatically, and only incurs cost when running.
Quick Answer
The answer is to configure S3 event notifications to invoke a Lambda function directly upon upload for serverless thumbnail generation. This solution is correct because S3 event notifications natively trigger Lambda asynchronously, allowing the function to process each new object immediately without any intermediary services, which minimizes both cost and operational overhead by scaling automatically to zero when idle and handling unpredictable traffic spikes without provisioning. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your ability to choose the simplest serverless integration for event-driven workloads, with a common trap being to over-engineer with SQS or ECS when a direct S3-to-Lambda trigger is sufficient and more cost-effective. Remember the memory tip: “S3 to Lambda, no middleman drama” — if the task is a simple, stateless transformation like thumbnail generation, keep the architecture flat and direct.
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. 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. 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 startup is building a serverless photo-sharing application on AWS. Users upload photos via a web app, which stores them in Amazon S3. Each upload triggers an AWS Lambda function that creates a thumbnail and stores it in another S3 bucket. The application is expected to have unpredictable traffic patterns. The startup wants to minimize costs and operational overhead while ensuring the thumbnail generation completes reliably. Which solution should a Solutions Architect recommend?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Configure S3 event notifications to invoke a Lambda function directly upon upload to generate thumbnails.
Option B is correct because S3 event notifications to Lambda are serverless, cost-effective, and scale automatically. Option A is wrong because EC2 instances incur cost even when idle and require management. Option C is wrong because SQS adds complexity and latency; Lambda can directly process S3 events. Option D is wrong because ECS with Fargate is more complex and expensive than Lambda for this simple task.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 Amazon ECS with Fargate to run a container that processes S3 events and generates thumbnails.
Why it's wrong here
ECS Fargate is more expensive and complex than Lambda for this use case.
- ✗
Upload to S3, send a message to an SQS queue, and have a Lambda function poll the queue to generate thumbnails.
Why it's wrong here
S3 event notifications can directly invoke Lambda; adding SQS introduces unnecessary complexity.
- ✗
Use an Auto Scaling group of EC2 instances to poll S3 for new uploads and generate thumbnails.
Why it's wrong here
EC2 instances run continuously, incurring cost even when idle; overscales for unpredictable traffic.
- ✓
Configure S3 event notifications to invoke a Lambda function directly upon upload to generate thumbnails.
Why this is correct
Lambda is serverless, scales automatically, and only incurs cost when running.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SAP-C02 NAT questions on configuration and troubleshooting.
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Design for New Solutions — study guide chapter
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Design for New Solutions practice questions
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
Design for New Solutions — This question tests Design for New Solutions — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Configure S3 event notifications to invoke a Lambda function directly upon upload to generate thumbnails. — Option B is correct because S3 event notifications to Lambda are serverless, cost-effective, and scale automatically. Option A is wrong because EC2 instances incur cost even when idle and require management. Option C is wrong because SQS adds complexity and latency; Lambda can directly process S3 events. Option D is wrong because ECS with Fargate is more complex and expensive than Lambda for this simple task.
What should I do if I get this SAP-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SAP-C02 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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