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Development with AWS Services →hardMultiple ChoiceObjective-mapped

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 critical application on AWS Lambda that processes real-time financial transactions. The Lambda function is triggered by an SQS queue that receives messages from an API Gateway. Recently, the team has observed an increase in processing errors and occasional data loss. Upon investigation, they find that the Lambda function's concurrency limit is set to 5, and the SQS queue has a visibility timeout of 30 seconds. The function typically takes 2 seconds to process a message, but during peak hours, the queue depth grows to thousands of messages. The errors occur when the Lambda function throws an exception, causing the message to return to the queue after the visibility timeout expires. However, some messages are never processed again and are eventually lost. The team suspects that the messages are being sent to the dead-letter queue (DLQ) after multiple retries, but the DLQ is not configured. The team needs to ensure that no messages are lost and that processing errors are handled appropriately. What should the team do to resolve this issue?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "never"
Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.

Question 1hardmultiple choice

Full question →

A
Increase the Lambda concurrency limit to 100 and set the SQS visibility timeout to 60 seconds.
Why wrong: While this may reduce backlog, it does not handle messages that fail repeatedly; without a DLQ, messages are still lost after retries.
B
Configure an Amazon CloudWatch alarm on the queue depth and set a Lambda function as the on-failure destination for asynchronous invocations.
Why wrong: CloudWatch alarm does not prevent message loss; Lambda on-failure destination is not applicable to SQS-triggered functions.
C
Change the Lambda invocation mode to synchronous and use API Gateway as a proxy to invoke the function directly.
Why wrong: Synchronous invocation does not solve the retry and loss issue; it may increase latency and complexity.
D
Configure a dead-letter queue on the SQS source queue and set the maximum receives to 3. Implement error handling in the Lambda function to catch exceptions and log them.
A DLQ captures failed messages after retries, preventing data loss and allowing manual or automated reprocessing.

Full breakdown with real-world context →

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

✓

Configure a dead-letter queue on the SQS source queue and set the maximum receives to 3. Implement error handling in the Lambda function to catch exceptions and log them.

Option B is correct. Configuring a dead-letter queue (DLQ) on the SQS queue ensures that messages that cannot be processed after a specified number of retries are moved to a separate queue for later analysis and reprocessing, preventing data loss. Option A is incorrect because increasing concurrency without a DLQ would still result in lost messages after retries are exhausted. Option C is incorrect because synchronous invocation does not solve the retry and loss problem. Option D is incorrect because Lambda's on-failure destination is for async invocations, not SQS-triggered Lambda (which uses event source mapping).

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.

✗
Increase the Lambda concurrency limit to 100 and set the SQS visibility timeout to 60 seconds.
Why it's wrong here
While this may reduce backlog, it does not handle messages that fail repeatedly; without a DLQ, messages are still lost after retries.
✗
Configure an Amazon CloudWatch alarm on the queue depth and set a Lambda function as the on-failure destination for asynchronous invocations.
Why it's wrong here
CloudWatch alarm does not prevent message loss; Lambda on-failure destination is not applicable to SQS-triggered functions.
✗
Change the Lambda invocation mode to synchronous and use API Gateway as a proxy to invoke the function directly.
Why it's wrong here
Synchronous invocation does not solve the retry and loss issue; it may increase latency and complexity.
✓
Configure a dead-letter queue on the SQS source queue and set the maximum receives to 3. Implement error handling in the Lambda function to catch exceptions and log them.
Why this is correct
A DLQ captures failed messages after retries, preventing data loss and allowing manual or automated reprocessing.
Clue confirmation
The clue word "never" in the question point toward this answer.
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 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.

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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: Configure a dead-letter queue on the SQS source queue and set the maximum receives to 3. Implement error handling in the Lambda function to catch exceptions and log them. — Option B is correct. Configuring a dead-letter queue (DLQ) on the SQS queue ensures that messages that cannot be processed after a specified number of retries are moved to a separate queue for later analysis and reprocessing, preventing data loss. Option A is incorrect because increasing concurrency without a DLQ would still result in lost messages after retries are exhausted. Option C is incorrect because synchronous invocation does not solve the retry and loss problem. Option D is incorrect because Lambda's on-failure destination is for async invocations, not SQS-triggered Lambda (which uses event source mapping).

What should I do if I get this DVA-C02 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "never". Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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