- A
Place Amazon API Gateway in front of AWS Lambda functions for request handling.
API Gateway plus Lambda fits spiky request traffic well because it removes server management and charges are based on actual use.
- B
Keep the EC2 fleet and add more instances so the idle cost is less noticeable.
Why wrong: Adding more always-on servers increases idle spend and directly contradicts the goal of paying only for usage.
- C
Use Amazon SQS to buffer notification work and decouple it from the request path.
SQS absorbs bursts and separates the user-facing request from downstream processing, improving cost efficiency and operational resilience.
- D
Move the API to an Application Load Balancer only, without changing compute.
Why wrong: An ALB can distribute traffic, but it does not remove the need to manage EC2 instances or eliminate idle capacity.
- E
Store runtime secrets in user data on each instance.
Why wrong: This does not address variable traffic or cost optimization, and it creates a poor secret-handling pattern.
Quick Answer
The answer is to use Amazon SQS to buffer notification work and decouple it from the request path, paired with API Gateway and Lambda to replace the EC2 fleet. This design is correct because it transforms the architecture into a fully serverless API that handles unpredictable traffic by scaling automatically with each request, while SQS absorbs spikes in downstream notification work so the Lambda function can return quickly without waiting for slow or bursty downstream services. On the SAA-C03 exam, this scenario tests your understanding of decoupling patterns and serverless cost optimization—a common trap is to keep EC2 instances for the notification logic or to use Lambda for everything without a buffer, which leads to timeouts and throttling under load. Remember the key principle: API Gateway + Lambda handles the request path, and SQS acts as a shock absorber for asynchronous work. Memory tip: “Sync the request, buffer the rest.”
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. 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 startup has an HTTP API with highly unpredictable traffic from mobile devices. Each request performs lightweight validation, writes an event record, and triggers downstream notifications. The current EC2 fleet stays mostly idle, and the team wants to reduce infrastructure management and pay only for usage. Which two changes best fit the requirement? Select two.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Place Amazon API Gateway in front of AWS Lambda functions for request handling.
Option A is correct because Amazon API Gateway can directly invoke AWS Lambda functions, eliminating the need to manage EC2 instances. This serverless architecture scales automatically with unpredictable traffic, and you pay only for the requests and compute time consumed, which aligns with the startup's goal of reducing idle costs and infrastructure management.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Place Amazon API Gateway in front of AWS Lambda functions for request handling.
Why this is correct
API Gateway plus Lambda fits spiky request traffic well because it removes server management and charges are based on actual use.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Keep the EC2 fleet and add more instances so the idle cost is less noticeable.
Why it's wrong here
Adding more always-on servers increases idle spend and directly contradicts the goal of paying only for usage.
- ✓
Use Amazon SQS to buffer notification work and decouple it from the request path.
Why this is correct
SQS absorbs bursts and separates the user-facing request from downstream processing, improving cost efficiency and operational resilience.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Move the API to an Application Load Balancer only, without changing compute.
Why it's wrong here
An ALB can distribute traffic, but it does not remove the need to manage EC2 instances or eliminate idle capacity.
- ✗
Store runtime secrets in user data on each instance.
Why it's wrong here
This does not address variable traffic or cost optimization, and it creates a poor secret-handling pattern.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates might think adding more EC2 instances (Option B) or using an ALB (Option D) solves the idle cost problem, but these options still require managing servers and incur idle costs, whereas serverless options (A and C) eliminate idle costs entirely.
Detailed technical explanation
How to think about this question
API Gateway supports throttling and request validation at the edge, reducing Lambda invocations for malformed requests. SQS decouples the notification work from the request path, allowing Lambda to process events asynchronously and retry on failure, which is ideal for downstream notifications that can tolerate latency. This pattern (API Gateway + Lambda + SQS) is a common serverless architecture for handling spiky traffic with minimal cost.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Design Secure Architectures — study guide chapter
Learn the concepts, then practise the questions
- →
Design Secure Architectures practice questions
Targeted practice on this topic area only
- →
All SAA-C03 questions
1,040 questions across all exam domains
- →
SAA-C03 study guide
Full concept coverage aligned to exam objectives
- →
SAA-C03 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related SAA-C03 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Design Secure Architectures practice questions
Practise SAA-C03 questions linked to Design Secure Architectures.
Design Resilient Architectures practice questions
Practise SAA-C03 questions linked to Design Resilient Architectures.
Design High-Performing Architectures practice questions
Practise SAA-C03 questions linked to Design High-Performing Architectures.
Design Cost-Optimized Architectures practice questions
Practise SAA-C03 questions linked to Design Cost-Optimized Architectures.
SAA-C03 VPC practice questions
Practise SAA-C03 questions linked to SAA-C03 VPC.
SAA-C03 S3 lifecycle policy questions
Practise SAA-C03 questions linked to SAA-C03 S3 lifecycle policy questions.
SAA-C03 RDS Multi-AZ questions
Practise SAA-C03 questions linked to SAA-C03 RDS Multi-AZ questions.
SAA-C03 IAM policy practice questions
Practise SAA-C03 questions linked to SAA-C03 IAM policy.
SAA-C03 Route 53 failover questions
Practise SAA-C03 questions linked to SAA-C03 Route 53 failover questions.
SAA-C03 CloudFront practice questions
Practise SAA-C03 questions linked to SAA-C03 CloudFront.
SAA-C03 NAT gateway questions
Practise SAA-C03 questions linked to SAA-C03 NAT gateway questions.
SAA-C03 VPC endpoint questions
Practise SAA-C03 questions linked to SAA-C03 VPC endpoint questions.
Practice this exam
Start a free SAA-C03 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Secure Architectures — This question tests Design Secure Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Place Amazon API Gateway in front of AWS Lambda functions for request handling. — Option A is correct because Amazon API Gateway can directly invoke AWS Lambda functions, eliminating the need to manage EC2 instances. This serverless architecture scales automatically with unpredictable traffic, and you pay only for the requests and compute time consumed, which aligns with the startup's goal of reducing idle costs and infrastructure management.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More SAA-C03 practice questions
- A content publishing system uses Lambda functions that call an unreliable third-party API. Failed events must be retaine…
- A startup runs two EC2-based workloads in the same AWS Region. Its customer-facing API is always on, and its nightly vid…
- A warehouse integration service must use shared file storage across Linux EC2 instances in multiple Availability Zones.…
- A team runs a stateless web app on Amazon EC2 behind an Application Load Balancer. During traffic spikes, new EC2 instan…
- A service in private subnets downloads product images from Amazon S3 and stores job state in DynamoDB. A NAT Gateway is…
- A static site is hosted in Amazon S3 and delivered by CloudFront. After a frontend release, the same JavaScript bundles…
Last reviewed: Jun 11, 2026
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.