SAA-C03 Design High-Performing Architectures Practice Question
This SAA-C03 practice question tests your understanding of design high-performing architectures. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. A key principle to apply: provisioned Concurrency keeps Lambda execution environments initialized.. 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 Lambda-based travel booking site has unpredictable traffic spikes and users see latency caused by cold starts. The function must respond consistently during expected campaign windows. What should be configured? The architecture review board prefers a managed AWS-native control.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Provisioned concurrency during campaign windows
Provisioned concurrency initializes a specified number of execution environments in advance, eliminating cold starts for those instances. During campaign windows, this ensures consistent latency by keeping the function warm and ready to handle spikes without the delay of initializing new environments. It is a managed AWS-native control that directly addresses the unpredictable traffic pattern described.
CloudTrail records API activity and does not reduce Lambda latency.
✗
Reserved concurrency only
Why it's wrong here
Reserved concurrency limits and reserves capacity but does not pre-initialize execution environments.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing reserved concurrency (which limits scaling but does not prevent cold starts) with provisioned concurrency (which pre-warms instances to eliminate cold starts), leading candidates to choose reserved concurrency as a simpler but incorrect solution.
Detailed technical explanation
How to think about this question
Under the hood, provisioned concurrency keeps the Lambda execution environment (sandbox) initialized and ready, including loading the runtime and code, so the first request sees no initialization overhead. AWS charges for provisioned concurrency even when idle, making it cost-effective only during predictable high-traffic windows. In real-world scenarios, combining provisioned concurrency with Application Auto Scaling can dynamically adjust the pre-warmed count based on a schedule or metric, further optimizing cost and performance.
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 provisioned Concurrency keeps Lambda execution environments initialized., then practise related SAA-C03 questions on the same topic to reinforce the concept.
The correct answer is: Provisioned concurrency during campaign windows — Provisioned concurrency initializes a specified number of execution environments in advance, eliminating cold starts for those instances. During campaign windows, this ensures consistent latency by keeping the function warm and ready to handle spikes without the delay of initializing new environments. It is a managed AWS-native control that directly addresses the unpredictable traffic pattern described.
What should I do if I get this SAA-C03 question wrong?
Review provisioned Concurrency keeps Lambda execution environments initialized., then practise related SAA-C03 questions on the same topic to reinforce the concept.
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Question Discussion
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