DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. 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 developer is designing a workflow using AWS Step Functions that includes a task to invoke an AWS Lambda function. The Lambda function sometimes times out due to long-running operations. The developer needs the workflow to wait for the Lambda function to complete asynchronously and retry on failure. Which Step Functions pattern should the developer use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a Task state with .waitForTaskToken and have the Lambda function return the token upon completion.
Option A is correct because the Task token (.waitForTaskToken) allows the Lambda function to run asynchronously and call back with the token upon completion, enabling long-running operations. Option B is wrong because it's synchronous and tied to Lambda's timeout. Option C is wrong because it's for parallel execution. Option D is wrong because it doesn't involve Lambda.
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 a Task state with .waitForTaskToken and have the Lambda function return the token upon completion.
Why this is correct
Allows asynchronous execution with callback.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use a Task state that directly invokes the Lambda function synchronously.
Why it's wrong here
Synchronous invocation times out with the function.
✗
Use a Parallel state to run multiple Lambda functions concurrently.
Why it's wrong here
Does not solve timeout issue.
✗
Use a Choice state to branch based on the Lambda function's output.
Why it's wrong here
No relation to asynchronous execution.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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: Use a Task state with .waitForTaskToken and have the Lambda function return the token upon completion. — Option A is correct because the Task token (.waitForTaskToken) allows the Lambda function to run asynchronously and call back with the token upon completion, enabling long-running operations. Option B is wrong because it's synchronous and tied to Lambda's timeout. Option C is wrong because it's for parallel execution. Option D is wrong because it doesn't involve Lambda.
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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