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 has an AWS Lambda function that processes messages from an Amazon SQS queue. The function sometimes fails due to transient errors. The developer wants to ensure that failed messages are retried automatically and then sent to a dead-letter queue after three failed attempts. How should the developer configure this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the SQS queue with a redrive policy and a dead-letter queue. Set the maxReceiveCount to 3.
Option A is correct because SQS redrive policy and dead-letter queue handle retries and failures. Option B is wrong because Lambda's retry is separate. Option C is wrong because DLQ on Lambda doesn't integrate with SQS retry logic. Option D is wrong because Lambda destination is for success/failure, not retries.
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.
✗
Enable Lambda function's DLQ and set the retry attempts to 3.
Why it's wrong here
Lambda DLQ is for async invocations, not SQS-triggered.
✗
Configure the Lambda function's reserved concurrency to 0 and set the DLQ on the function.
Why it's wrong here
Reserved concurrency 0 stops invocations.
✓
Configure the SQS queue with a redrive policy and a dead-letter queue. Set the maxReceiveCount to 3.
Why this is correct
SQS handles retries via visibility timeout and moves to DLQ after 3 receives.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use an Amazon SNS topic to send failed messages to a DLQ after three Lambda invocations.
Why it's wrong here
SNS doesn't provide retry logic.
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: Configure the SQS queue with a redrive policy and a dead-letter queue. Set the maxReceiveCount to 3. — Option A is correct because SQS redrive policy and dead-letter queue handle retries and failures. Option B is wrong because Lambda's retry is separate. Option C is wrong because DLQ on Lambda doesn't integrate with SQS retry logic. Option D is wrong because Lambda destination is for success/failure, not retries.
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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