Practice Questions and Explanations for AWS Solutions Architect – Associate Exam

The AWS Certified Solutions Architect – Associate exam validates foundational knowledge and skills in designing scalable, secure, and cost-efficient cloud architectures using AWS services.

Practice questions aligned with the current exam blueprint sharpen problem-solving abilities and reinforce understanding of key concepts such as AWS compute, storage, networking, security, and deployment patterns. 

Practice Questions and Explanations

Question 1:

Scenario: A company wants to host a highly available web application using Amazon EC2 instances across multiple Availability Zones. What AWS service ensures automatic traffic distribution to healthy instances?

Options:

A. Amazon Route 53

B. Elastic Load Balancing (ELB)

C. AWS Auto Scaling

D. AWS CloudTrail

Answer: B. Elastic Load Balancing (ELB)

Explanation: ELB automatically distributes incoming application traffic across multiple Amazon EC2 instances in different Availability Zones. It performs health checks and routes traffic only to healthy instances, ensuring high availability and fault tolerance.

Auto Scaling manages capacity but does not distribute traffic; Route 53 manages DNS; CloudTrail tracks API activity but is not involved in traffic routing.

Question 2:

Scenario: An application requires a serverless architecture to handle unpredictable incoming events with zero server management. Which AWS service is most suitable for hosting the application code?

Options:

A. Amazon EC2

B. AWS Lambda

C. Amazon Elastic Beanstalk

D. Amazon RDS

Answer: B. AWS Lambda

Explanation: AWS Lambda is a serverless compute service that automatically runs code in response to events. It eliminates server management and scales automatically, charging only for execution time. EC2 requires managing instances; Elastic Beanstalk manages servers but is not serverless; RDS is a database service.

Question 3:

Scenario: A company wants to secure data at rest in Amazon S3. They want full control over encryption keys and audit capabilities for key usage. Which option should they use?

Options:

A. Server-Side Encryption with Amazon S3-Managed Keys (SSE-S3)

B. Client-side Encryption

C. Server-Side Encryption with AWS KMS Keys (SSE-KMS)

D. Server-Side Encryption with Customer-Provided Keys (SSE-C)

Answer: C. Server-Side Encryption with AWS KMS Keys (SSE-KMS)

Explanation: SSE-KMS integrates with AWS Key Management Service, allowing customer control over key rotation, IAM policies, and audit logging through AWS CloudTrail. SSE-S3 encrypts at rest but does not provide key management control. SSE-C requires customers to manage keys entirely. Client-side encryption is done before upload and is not managed by AWS.

Question 4:

Scenario: To optimize costs, a solutions architect wants to reduce EC2 instance spend for fault-tolerant, flexible batch jobs that can be interrupted. Which AWS pricing model is best suited?

Options:

A. On-Demand Instances

B. Reserved Instances

C. Spot Instances

D. Dedicated Hosts

Answer: C. Spot Instances

Explanation: Spot Instances offer significant discounts (up to 90%) but can be interrupted with short notice, making them ideal for fault-tolerant, flexible workloads such as batch processing. On-Demand is costly but reliable; Reserved Instances require commitment; Dedicated Hosts are for compliance and licensing.

Question 5:

Scenario: What is the primary AWS service used for Infrastructure as Code (IaC) to automate deploying and managing cloud resources?

Options:

A. AWS CloudTrail

B. AWS CloudFormation

C. AWS Config

D. AWS Systems Manager

Answer: B. AWS CloudFormation

Explanation: AWS CloudFormation allows creating and managing AWS resources using declarative JSON or YAML templates, enabling automated, repeatable infrastructure deployments. CloudTrail is for API activity logging; Config tracks configuration changes; Systems Manager manages operational tasks.