SAA-C03 Design High-Performing Architectures Practice Question
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.
⚠ Common exam trap
A common mix-up: candidates confuse 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.
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
✓
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.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Provisioned concurrency during campaign windows
Why this is correct
Provisioned concurrency during campaign windows is the correct solution because it initializes the Lambda runtime and application code in advance, removing the cold-start penalty for the first request in each concurrently processed execution environment. By setting a provisioned concurrency level prior to the campaign, the booking site can handle unpredictable spikes with consistently low latency, and the configuration can be scaled or scheduled to align with expected traffic patterns.
- ✗
A larger deployment package
Why it's wrong here
A larger deployment package increases the time Lambda needs to download and unpack your code and dependencies before executing the handler. Since cold starts require loading and initializing everything from scratch, the larger the package, the longer the initialization latency, which is the opposite of what the booking site needs during unpredictable traffic spikes.
- ✗
CloudTrail data events
Why it's wrong here
CloudTrail data events capture management and data-plane API activity for auditing, security analysis, and compliance purposes. Enabling CloudTrail creates logs of all requests, but it has no mechanism to affect Lambda's execution environment lifecycle, memory allocation, or runtime initialization, so it would not reduce latency in any way.
- ✗
Reserved concurrency only
Why it's wrong here
Reserved concurrency only caps the maximum number of concurrent executions for a function, ensuring it doesn't consume all regional concurrency, but it does not create any pre-warmed instances. Even with a reserved limit, each new environment still undergoes a full cold start when invoked, so spikes in traffic will still experience the same initial latency delays.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SAA-C03 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SAA-C03 exam.