The answer is to enable provisioned concurrency on the Lambda function. Provisioned concurrency pre-initializes a specified number of execution environments, keeping them warm and ready to handle requests instantly, which directly eliminates the cold start latency caused by Java’s JVM startup and large library loading. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of Lambda performance optimization, often paired with API Gateway integrations where latency is critical. A common trap is assuming that increasing memory or switching runtimes is the best fix, but provisioned concurrency is the most direct and effective solution without requiring code changes. Remember the mnemonic: “Provisioned = Pre-warmed; no more cold-start harm.”
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 optimizing an API Gateway REST API that uses Lambda integration. The response times are high, and CloudWatch logs show that the Lambda function has cold starts frequently. The function is written in Java and uses a large library. What is the MOST effective optimization?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable provisioned concurrency on the Lambda function.
Option B is correct because using provisioned concurrency keeps the function initialized and warm, eliminating cold starts. Option A is wrong because increasing memory does not directly reduce cold start time. Option C is wrong because using the AWS SDK alone does not reduce cold starts. Option D is wrong because using a Node.js function would reduce cold starts but may require rewriting the code, which is not as effective as provisioned concurrency.
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.
✗
Rewrite the function in Node.js to reduce cold start time.
Why it's wrong here
Rewriting is costly and may not be the most effective optimization compared to provisioned concurrency.
✗
Increase the Lambda function's memory allocation to 3008 MB.
Why it's wrong here
More memory can speed up execution but does not prevent cold starts.
✓
Enable provisioned concurrency on the Lambda function.
Why this is correct
Provisioned concurrency keeps a number of execution environments initialized and ready to respond immediately, eliminating cold starts.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use the AWS SDK for Java 2.x to reduce initialization time.
Why it's wrong here
While the SDK 2.x may have lower overhead, it does not eliminate cold starts entirely.
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.
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Enable provisioned concurrency on the Lambda function. — Option B is correct because using provisioned concurrency keeps the function initialized and warm, eliminating cold starts. Option A is wrong because increasing memory does not directly reduce cold start time. Option C is wrong because using the AWS SDK alone does not reduce cold starts. Option D is wrong because using a Node.js function would reduce cold starts but may require rewriting the code, which is not as effective as provisioned concurrency.
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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