DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. 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 company runs a data processing pipeline using AWS Step Functions. The pipeline starts with a task that reads a CSV file from Amazon S3 and then fans out to multiple parallel Lambda functions for data transformation. The final step aggregates the results and writes to an Amazon DynamoDB table. Recently, the pipeline has been failing intermittently with 'StateMachineExecutionLimitExceeded' errors. The development team has already increased the execution history limit to the maximum. The pipeline runs about 500 executions per day. Meanwhile, the operations team reports that some executions are timing out after 5 minutes, even though each Lambda function completes within 30 seconds. The Step Function definition uses a Map state with a max concurrency of 20. The developer needs to fix both issues. Which combination of actions should the developer take? (Choose the BEST option.)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Reduce the max concurrency of the Map state and increase the task execution timeout in the Step Function definition.
Option A is correct because reducing max concurrency and increasing task timeout addresses both state machine execution limits and timeouts. Option B is wrong because increasing map concurrency would worsen throttling. Option C is wrong because splitting into multiple state machines does not address task timeouts. Option D is wrong because Lambda reserved concurrency does not prevent state machine throttling.
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.
✓
Reduce the max concurrency of the Map state and increase the task execution timeout in the Step Function definition.
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Split the pipeline into multiple smaller Step Functions and chain them together.
Why it's wrong here
Splitting reduces per-state-machine executions but does not address task timeouts.
✗
Increase the max concurrency of the Map state and add a retry policy.
Why it's wrong here
Increasing concurrency would increase parallelism, worsening throttling.
✗
Set a Lambda reserved concurrency for the transformation functions to 100.
Why it's wrong here
Reserved concurrency limits Lambda invocations but does not prevent state machine throttling.
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 DVA-C02 NAT questions on configuration and troubleshooting.
Development with AWS Services — This question tests Development with AWS Services — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Reduce the max concurrency of the Map state and increase the task execution timeout in the Step Function definition. — Option A is correct because reducing max concurrency and increasing task timeout addresses both state machine execution limits and timeouts. Option B is wrong because increasing map concurrency would worsen throttling. Option C is wrong because splitting into multiple state machines does not address task timeouts. Option D is wrong because Lambda reserved concurrency does not prevent state machine throttling.
What should I do if I get this DVA-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 DVA-C02 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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