The correct answer is to configure Provisioned Concurrency for the Lambda function. This solution directly addresses cold start latency by pre-initializing a specified number of execution environments, keeping them warm and ready to handle requests instantly without the delay of spinning up a new container. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this question tests your understanding of Lambda performance optimization under the Serverless Architecture domain, often appearing in scenarios involving latency-sensitive APIs or real-time workloads. A common trap is confusing Provisioned Concurrency with increasing memory, which reduces cold start duration but does not eliminate it, or with using a VPC, which can actually worsen latency. Remember the memory tip: “Provisioned Concurrency prevents the pause” — it’s the only option that guarantees zero cold starts for the configured concurrency level, making it the definitive choice for predictable, low-latency serverless applications.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 company has a serverless application using AWS Lambda and Amazon API Gateway. The application experiences cold starts that cause latency spikes. Which solution would reduce the impact of cold starts?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure Provisioned Concurrency for the Lambda function.
Option D is correct because Provisioned Concurrency keeps a number of execution environments warm. Option A is wrong because increasing memory reduces cold start duration but does not eliminate it. Option B is wrong because it increases cost and complexity. Option C is wrong because it reduces performance.
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.
✓
Configure Provisioned Concurrency for the Lambda function.
Why this is correct
Ensures a set number of environments are initialized and ready.
Related concept
Static NAT maps one inside address to one outside address.
✗
Increase the Lambda function memory allocation.
Why it's wrong here
Larger memory can reduce cold start time but not eliminate it entirely.
✗
Decrease the Lambda function timeout.
Why it's wrong here
Timeout does not affect cold starts.
✗
Use a VPC and enable Lambda to access resources in the VPC.
Why it's wrong here
VPC can increase cold starts due to ENI creation.
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 SAP-C02 NAT questions on configuration and troubleshooting.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Configure Provisioned Concurrency for the Lambda function. — Option D is correct because Provisioned Concurrency keeps a number of execution environments warm. Option A is wrong because increasing memory reduces cold start duration but does not eliminate it. Option B is wrong because it increases cost and complexity. Option C is wrong because it reduces performance.
What should I do if I get this SAP-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 SAP-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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