AWS Certified Solutions Architect – Professional Practice Exam Questions And 100% Correct Answers With Complete Explanations 2026.

AWS Certified Solutions Architect – Professional Practice Exam Questions
And 100% Correct Answers With Complete Explanations 2026.


1. A company is designing a multi-region architecture for a mission-critical application
with strict RTO and RPO requirements. Which AWS service combination provides
the fastest failover with near-zero data loss?
A. Amazon S3 Cross-Region Replication with Route 53 failover routing
B. Amazon Aurora Global Database with Route 53 health checks
C. Amazon RDS Multi-AZ with AWS Backup cross-region copy
D. AWS Storage Gateway with CloudFront failover
Correct Answer: B
Explanation: Aurora Global Database provides cross-region replication with low
latency and near-zero RPO, while Route 53 enables fast failover. Other options either
have higher latency or do not support near-zero RPO.



2. A solutions architect must design a cost-efficient data lake for infrequently accessed
data with occasional analytics queries. Which approach is MOST cost-effective?
A. Store data in S3 Standard and query using Athena
B. Store data in S3 Glacier Deep Archive and restore when needed
C. Store data in S3 Intelligent-Tiering and query with Redshift Spectrum
D. Store data in EBS volumes attached to EC2 instances
Correct Answer: C
Explanation: S3 Intelligent-Tiering automatically optimizes storage costs, and
Redshift Spectrum allows querying without moving data. Glacier has high retrieval
latency, and EBS is not suitable for data lakes.



3. A company requires strict network isolation between workloads in the same VPC.
What is the BEST solution?
A. Use separate subnets with route tables
B. Implement security groups only
C. Use AWS PrivateLink endpoints
D. Use VPC traffic mirroring
Correct Answer: C
Explanation: AWS PrivateLink ensures private connectivity between services with
strong isolation. Subnets and security groups alone do not fully isolate traffic at
service level.



4. A company needs to run batch processing jobs that can tolerate interruptions. Which
EC2 purchasing option should be used?
A. On-Demand Instances
B. Reserved Instances
C. Spot Instances

, D. Dedicated Hosts
Correct Answer: C
Explanation: Spot Instances provide significant cost savings and are suitable for
interruptible workloads. Others are more expensive or unnecessary.



5. A high-traffic web application needs to reduce latency globally. Which architecture is
BEST?
A. Use a single-region ALB
B. Deploy EC2 in multiple AZs
C. Use CloudFront with edge locations
D. Use Route 53 weighted routing
Correct Answer: C
Explanation: CloudFront caches content globally at edge locations, reducing latency
significantly compared to regional-only solutions.



6. A company wants to enforce encryption for all data stored in S3. What is the BEST
solution?
A. Enable default encryption on the bucket
B. Use IAM policies only
C. Use CloudTrail monitoring
D. Use VPC endpoints
Correct Answer: A
Explanation: Default encryption ensures all objects are encrypted automatically. IAM
policies alone cannot enforce encryption on all uploads.



7. An application requires a shared file system accessible across multiple EC2 instances
in different AZs. Which service should be used?
A. Amazon EBS
B. Amazon EFS
C. Amazon S3
D. Amazon FSx for Windows
Correct Answer: B
Explanation: EFS provides a scalable, shared file system accessible across AZs. EBS
is limited to a single AZ.



8. A company wants to reduce NAT Gateway costs. Which solution is BEST?
A. Replace NAT Gateway with NAT Instance
B. Use VPC endpoints for AWS services
C. Use Internet Gateway
D. Use VPN connection
Correct Answer: B

, Explanation: VPC endpoints allow private access to AWS services without NAT,
reducing data transfer and NAT costs.



9. A microservices architecture requires decoupling and asynchronous processing.
Which service is BEST?
A. Amazon SNS
B. Amazon SQS
C. AWS Step Functions
D. AWS Lambda
Correct Answer: B
Explanation: SQS enables decoupled, reliable message queuing. SNS is for pub/sub,
not queue persistence.



10. A company needs to migrate an on-prem database to AWS with minimal downtime.
Which service should be used?
A. AWS DataSync
B. AWS DMS
C. AWS Snowball
D. AWS Glue
Correct Answer: B
Explanation: AWS DMS supports continuous replication, enabling minimal downtime
migration.



11. Which AWS service provides fine-grained access control at the API level?
A. IAM policies
B. Security Groups
C. NACLs
D. Route Tables
Correct Answer: A
Explanation: IAM policies control permissions at API level. Security groups and
NACLs operate at network level.



12. A system requires high availability for stateless web servers. What is the BEST
design?
A. Single EC2 instance
B. Auto Scaling group across AZs
C. Dedicated host
D. EC2 Spot only
Correct Answer: B
Explanation: Auto Scaling across AZs ensures high availability and scalability.

, 13. Which service is BEST for real-time stream processing?
A. Amazon S3
B. Amazon Kinesis
C. AWS Glue
D. Amazon Athena
Correct Answer: B
Explanation: Kinesis is designed for real-time streaming data processing.



14. A company needs to monitor API calls across AWS accounts. Which service should
be used?
A. CloudWatch
B. CloudTrail
C. Config
D. Trusted Advisor
Correct Answer: B
Explanation: CloudTrail logs API activity across AWS accounts.



15. Which storage class is BEST for frequently accessed data with low latency?
A. S3 Glacier
B. S3 Standard
C. S3 IA
D. S3 Deep Archive
Correct Answer: B
Explanation: S3 Standard is optimized for frequent access with low latency.



16. A company wants to deploy infrastructure as code. Which service is BEST?
A. AWS CloudFormation
B. AWS OpsWorks
C. AWS Systems Manager
D. AWS Config
Correct Answer: A
Explanation: CloudFormation enables declarative infrastructure provisioning.



17. Which service helps improve database read scalability?
A. Read replicas
B. Multi-AZ
C. Snapshots
D. Backups
Correct Answer: A
Explanation: Read replicas distribute read traffic, improving scalability.