The answer is a serverless stack combining Amazon API Gateway, AWS Lambda, Amazon SQS, Amazon DynamoDB, and Amazon CloudWatch. This combination is correct because it delivers a fully decoupled microservices architecture on AWS where each service is independently deployable and scales automatically to handle unpredictable traffic spikes—SQS buffers sudden load between services, Lambda provides stateless, event-driven compute without provisioning, and DynamoDB offers serverless NoSQL storage that scales with demand. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your ability to design resilient, event-driven systems that avoid tight coupling and single points of failure; a common trap is choosing EC2 or ECS with manual scaling, which fails the “unpredictable spikes” requirement. Remember the mnemonic “ALL-SQS” for the core services: API Gateway, Lambda, SQS, DynamoDB, and CloudWatch for observability.
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 company is designing a new microservices architecture on AWS. Each microservice must be independently deployable and scalable. The company expects unpredictable traffic patterns with sudden spikes. Which combination of AWS services should be used to build a decoupled, resilient system?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Amazon API Gateway, AWS Lambda, Amazon SQS, Amazon DynamoDB, and Amazon CloudWatch.
Option A is correct because it combines API Gateway as a managed entry point, Lambda for stateless compute, SQS for decoupling and buffering sudden traffic spikes, DynamoDB for serverless NoSQL storage, and CloudWatch for observability. This serverless stack ensures each microservice is independently deployable and scales automatically without provisioning, handling unpredictable spikes via SQS queue depth and Lambda concurrency limits.
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.
✓
Use Amazon API Gateway, AWS Lambda, Amazon SQS, Amazon DynamoDB, and Amazon CloudWatch.
Why this is correct
This option provides serverless, decoupled, and scalable components ideal for unpredictable spikes.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Application Load Balancer, Amazon EC2 Auto Scaling, Amazon SQS, and Amazon RDS.
Why it's wrong here
EC2 Auto Scaling has slower response to sudden spikes compared to serverless options.
✗
Use Amazon API Gateway, AWS Lambda, Amazon Kinesis Data Streams, and Amazon DynamoDB.
Why it's wrong here
Kinesis is for streaming, not request-response; adding unnecessary complexity.
✗
Use Application Load Balancer, Amazon ECS with Fargate, Amazon SQS, and Amazon RDS with read replicas.
Why it's wrong here
RDS may become a bottleneck under unpredictable spikes; DynamoDB is more suitable.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Kinesis Data Streams (Option C) thinking it provides better decoupling, but they overlook that SQS is specifically designed for asynchronous message buffering with per-message visibility timeouts, which is more appropriate for microservices decoupling than Kinesis's shard-based streaming model.
Detailed technical explanation
How to think about this question
SQS provides a durable buffer with a default visibility timeout of 30 seconds and a maximum retention period of 14 days, allowing Lambda to poll messages at a controlled rate via event source mapping. DynamoDB's on-demand capacity mode can handle millions of requests per second without pre-provisioning, making it ideal for unpredictable traffic. CloudWatch metrics and alarms can trigger auto-scaling policies for Lambda reserved concurrency or SQS queue scaling, ensuring the system remains resilient under load.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
Design for New Solutions — This question tests Design for New Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Amazon API Gateway, AWS Lambda, Amazon SQS, Amazon DynamoDB, and Amazon CloudWatch. — Option A is correct because it combines API Gateway as a managed entry point, Lambda for stateless compute, SQS for decoupling and buffering sudden traffic spikes, DynamoDB for serverless NoSQL storage, and CloudWatch for observability. This serverless stack ensures each microservice is independently deployable and scales automatically without provisioning, handling unpredictable spikes via SQS queue depth and Lambda concurrency limits.
What should I do if I get this SAP-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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