- A
Use Amazon API Gateway in front of each service to throttle requests and protect against traffic spikes.
Why wrong: API Gateway helps with throttling but does not prevent cascading failures due to service dependencies.
- B
Implement retry logic with exponential backoff, circuit breakers, and timeouts in each service's client code.
Circuit breakers and retries isolate failures and prevent cascading, a standard resilience pattern.
- C
Convert all inter-service communication to asynchronous messaging using Amazon SQS or SNS.
Why wrong: Asynchronous communication can decouple services but requires significant changes; not always appropriate for synchronous interactions.
- D
Deploy multiple instances of each service across multiple Availability Zones and use an Application Load Balancer.
Why wrong: High availability is good but does not prevent cascading failures; a failing service still fails.
Quick Answer
The correct answer is to implement retry logic with exponential backoff, circuit breakers, and timeouts in each service’s client code. This combination directly prevents cascading failures in microservices on ECS Fargate by ensuring that when a downstream service, like the payment service, becomes slow or unresponsive, the upstream service does not keep waiting indefinitely or hammer it with repeated requests. The circuit breaker trips after a threshold of failures, stopping traffic to the failing service and allowing it to recover, while exponential backoff spaces out retries to avoid overwhelming the system. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this question tests your understanding of resilience patterns in distributed systems, often appearing as a trap where candidates mistakenly choose scaling or API Gateway as a cure-all. A common memory tip is the “three-legged stool” of fault isolation: timeouts, retries with backoff, and circuit breakers—remove any one leg, and the system topples under load.
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 building a new microservices-based application on AWS using Amazon ECS with Fargate. The application has a frontend service, an order service, and a payment service. Services communicate synchronously via REST APIs. The company expects variable traffic and wants to ensure that failures in one service do not cascade to others. Which solution should a Solutions Architect recommend?
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
Implement retry logic with exponential backoff, circuit breakers, and timeouts in each service's client code.
Option D is correct because implementing circuit breakers, retries, and timeouts is a standard pattern to prevent cascading failures. Option A is wrong because synchronous communication is already in place; adding an API Gateway doesn't prevent cascading failures. Option B is wrong because adding more instances does not protect against service failures. Option C is wrong because converting to asynchronous messaging is a larger architectural change and may not be suitable for all interactions.
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 API Gateway in front of each service to throttle requests and protect against traffic spikes.
Why it's wrong here
API Gateway helps with throttling but does not prevent cascading failures due to service dependencies.
- ✓
Implement retry logic with exponential backoff, circuit breakers, and timeouts in each service's client code.
Why this is correct
Circuit breakers and retries isolate failures and prevent cascading, a standard resilience pattern.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Convert all inter-service communication to asynchronous messaging using Amazon SQS or SNS.
Why it's wrong here
Asynchronous communication can decouple services but requires significant changes; not always appropriate for synchronous interactions.
- ✗
Deploy multiple instances of each service across multiple Availability Zones and use an Application Load Balancer.
Why it's wrong here
High availability is good but does not prevent cascading failures; a failing service still fails.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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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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: Implement retry logic with exponential backoff, circuit breakers, and timeouts in each service's client code. — Option D is correct because implementing circuit breakers, retries, and timeouts is a standard pattern to prevent cascading failures. Option A is wrong because synchronous communication is already in place; adding an API Gateway doesn't prevent cascading failures. Option B is wrong because adding more instances does not protect against service failures. Option C is wrong because converting to asynchronous messaging is a larger architectural change and may not be suitable for all interactions.
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.
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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