- A
Publish a message to an Amazon SNS topic that triggers an email to the approver. The workflow continues after a fixed timeout.
Why wrong: This does not allow waiting for a specific approval response.
- B
Schedule a CloudWatch Events rule to trigger a Lambda function that checks for approval status in a DynamoDB table.
Why wrong: This is a polling approach that is less efficient and more complex.
- C
Use Amazon Cognito to manage user identities and require the approver to authenticate via a web portal.
Why wrong: Cognito is not designed for workflow approval callbacks.
- D
Use a Step Functions activity task that sends a message to an Amazon SQS queue. The approval process polls the queue and sends a task success response with the .taskToken.
Step Functions activity tasks support callback tokens for manual intervention.
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 is using AWS Step Functions to orchestrate a workflow that processes orders. The workflow includes a task that calls a Lambda function to validate the order. If the validation fails, the workflow should wait for manual approval before proceeding. What is the MOST efficient way to implement this manual approval step?
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
Use a Step Functions activity task that sends a message to an Amazon SQS queue. The approval process polls the queue and sends a task success response with the .taskToken.
Option A is correct because Step Functions has a built-in 'Wait for Callback' pattern with .taskToken and activity tasks that can integrate with SQS to wait for manual approval. Option B is wrong because an SNS topic does not provide a callback mechanism. Option C is wrong because CloudWatch Events is for scheduling and events, not for manual approval workflows. Option D is wrong because Cognito is for user authentication, not workflow approval.
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.
- ✗
Publish a message to an Amazon SNS topic that triggers an email to the approver. The workflow continues after a fixed timeout.
Why it's wrong here
This does not allow waiting for a specific approval response.
- ✗
Schedule a CloudWatch Events rule to trigger a Lambda function that checks for approval status in a DynamoDB table.
Why it's wrong here
This is a polling approach that is less efficient and more complex.
- ✗
Use Amazon Cognito to manage user identities and require the approver to authenticate via a web portal.
Why it's wrong here
Cognito is not designed for workflow approval callbacks.
- ✓
Use a Step Functions activity task that sends a message to an Amazon SQS queue. The approval process polls the queue and sends a task success response with the .taskToken.
Why this is correct
Step Functions activity tasks support callback tokens for manual intervention.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
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 Step Functions activity task that sends a message to an Amazon SQS queue. The approval process polls the queue and sends a task success response with the .taskToken. — Option A is correct because Step Functions has a built-in 'Wait for Callback' pattern with .taskToken and activity tasks that can integrate with SQS to wait for manual approval. Option B is wrong because an SNS topic does not provide a callback mechanism. Option C is wrong because CloudWatch Events is for scheduling and events, not for manual approval workflows. Option D is wrong because Cognito is for user authentication, not workflow approval.
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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Last reviewed: Jun 20, 2026
This DVA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DVA-C02 exam.
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