AWS CLF-C02 Advanced Application
Questions 2026–2027 | Cloud
Practitioner Problem-Solving, Service
Selection & Certification Prep
1. A company hosts a customer-facing application on Amazon EC2. Traffic is
unpredictable, and the application must remain available if an Availability
Zone fails. Which architecture best meets these requirements?
A. Deploy all EC2 instances in one Availability Zone
B. Deploy EC2 instances across multiple Availability Zones behind an Elastic Load
Balancer
C. Use one larger EC2 instance in a single Availability Zone
D. Store application data on the EC2 instance's local storage
Answer: Deploy EC2 instances across multiple Availability Zones behind an
Elastic Load Balancer
Rationale: Deploying resources across multiple Availability Zones improves
availability and fault tolerance. An Elastic Load Balancer distributes incoming
traffic across healthy instances and can route traffic away from failed instances.
, 2. A development team needs to run a batch workload that can tolerate
interruptions. The workload does not need to run continuously. Which EC2
purchasing option is generally the most cost-effective?
A. On-Demand Instances
B. Dedicated Hosts
C. Spot Instances
D. Reserved Instances
Answer: Spot Instances
Rationale: Spot Instances use spare Amazon EC2 capacity and can provide
substantial savings for interruptible workloads. They are well suited to flexible
batch processing and other fault-tolerant applications.
3. A company wants to automatically adjust the number of EC2 instances
based on application demand. Which AWS capability should it use?
A. AWS Auto Scaling
B. AWS CloudTrail
C. AWS Config
D. AWS Artifact
Answer: AWS Auto Scaling
Rationale: AWS Auto Scaling can automatically increase or decrease compute
capacity according to demand and configured scaling policies, helping maintain
performance while controlling costs.
4. An organization needs object storage for millions of images that users
upload. Which AWS service is most appropriate?
A. Amazon EBS
B. Amazon S3
C. Amazon RDS
D. Amazon FSx
Answer: Amazon S3
,Rationale: Amazon S3 is an object storage service designed for highly scalable
storage of objects such as images, documents, backups, and application data.
5. A company wants to reduce storage costs for data that is rarely accessed
but must be retained for several years. Which S3 storage class is most
appropriate for long-term archival?
A. S3 Standard
B. S3 Intelligent-Tiering
C. S3 Glacier Deep Archive
D. S3 Express One Zone
Answer: S3 Glacier Deep Archive
Rationale: S3 Glacier Deep Archive is designed for long-term retention of data
that is rarely accessed, offering very low storage costs compared with frequently
accessed S3 storage classes.
6. An application requires a relational database with automated backups,
patching, and managed infrastructure. Which service should the company
choose?
A. Amazon RDS
B. Amazon S3
C. Amazon DynamoDB
D. Amazon EFS
Answer: Amazon RDS
Rationale: Amazon RDS is a managed relational database service that simplifies
administration tasks such as backups, software patching, and database
provisioning.
7. A mobile application requires a database capable of handling massive
request volumes with single-digit millisecond performance. Which AWS
service is the strongest fit?
, A. Amazon DynamoDB
B. Amazon Redshift
C. Amazon RDS for Oracle
D. Amazon S3
Answer: Amazon DynamoDB
Rationale: DynamoDB is a fully managed NoSQL database designed for high-
scale workloads requiring predictable low-latency performance.
8. A company wants users around the world to receive static website content
with low latency. Which AWS service should be placed in front of the
content?
A. Amazon CloudFront
B. Amazon RDS
C. AWS Direct Connect
D. Amazon Inspector
Answer: Amazon CloudFront
Rationale: CloudFront is AWS's content delivery network. It caches content at
edge locations closer to users, reducing latency and improving delivery
performance.
9. A company needs to protect a web application from common SQL injection
and cross-site scripting attacks. Which AWS service is designed for this
purpose?
A. AWS WAF
B. AWS Shield only
C. Amazon GuardDuty
D. AWS CloudTrail
Answer: AWS WAF
Questions 2026–2027 | Cloud
Practitioner Problem-Solving, Service
Selection & Certification Prep
1. A company hosts a customer-facing application on Amazon EC2. Traffic is
unpredictable, and the application must remain available if an Availability
Zone fails. Which architecture best meets these requirements?
A. Deploy all EC2 instances in one Availability Zone
B. Deploy EC2 instances across multiple Availability Zones behind an Elastic Load
Balancer
C. Use one larger EC2 instance in a single Availability Zone
D. Store application data on the EC2 instance's local storage
Answer: Deploy EC2 instances across multiple Availability Zones behind an
Elastic Load Balancer
Rationale: Deploying resources across multiple Availability Zones improves
availability and fault tolerance. An Elastic Load Balancer distributes incoming
traffic across healthy instances and can route traffic away from failed instances.
, 2. A development team needs to run a batch workload that can tolerate
interruptions. The workload does not need to run continuously. Which EC2
purchasing option is generally the most cost-effective?
A. On-Demand Instances
B. Dedicated Hosts
C. Spot Instances
D. Reserved Instances
Answer: Spot Instances
Rationale: Spot Instances use spare Amazon EC2 capacity and can provide
substantial savings for interruptible workloads. They are well suited to flexible
batch processing and other fault-tolerant applications.
3. A company wants to automatically adjust the number of EC2 instances
based on application demand. Which AWS capability should it use?
A. AWS Auto Scaling
B. AWS CloudTrail
C. AWS Config
D. AWS Artifact
Answer: AWS Auto Scaling
Rationale: AWS Auto Scaling can automatically increase or decrease compute
capacity according to demand and configured scaling policies, helping maintain
performance while controlling costs.
4. An organization needs object storage for millions of images that users
upload. Which AWS service is most appropriate?
A. Amazon EBS
B. Amazon S3
C. Amazon RDS
D. Amazon FSx
Answer: Amazon S3
,Rationale: Amazon S3 is an object storage service designed for highly scalable
storage of objects such as images, documents, backups, and application data.
5. A company wants to reduce storage costs for data that is rarely accessed
but must be retained for several years. Which S3 storage class is most
appropriate for long-term archival?
A. S3 Standard
B. S3 Intelligent-Tiering
C. S3 Glacier Deep Archive
D. S3 Express One Zone
Answer: S3 Glacier Deep Archive
Rationale: S3 Glacier Deep Archive is designed for long-term retention of data
that is rarely accessed, offering very low storage costs compared with frequently
accessed S3 storage classes.
6. An application requires a relational database with automated backups,
patching, and managed infrastructure. Which service should the company
choose?
A. Amazon RDS
B. Amazon S3
C. Amazon DynamoDB
D. Amazon EFS
Answer: Amazon RDS
Rationale: Amazon RDS is a managed relational database service that simplifies
administration tasks such as backups, software patching, and database
provisioning.
7. A mobile application requires a database capable of handling massive
request volumes with single-digit millisecond performance. Which AWS
service is the strongest fit?
, A. Amazon DynamoDB
B. Amazon Redshift
C. Amazon RDS for Oracle
D. Amazon S3
Answer: Amazon DynamoDB
Rationale: DynamoDB is a fully managed NoSQL database designed for high-
scale workloads requiring predictable low-latency performance.
8. A company wants users around the world to receive static website content
with low latency. Which AWS service should be placed in front of the
content?
A. Amazon CloudFront
B. Amazon RDS
C. AWS Direct Connect
D. Amazon Inspector
Answer: Amazon CloudFront
Rationale: CloudFront is AWS's content delivery network. It caches content at
edge locations closer to users, reducing latency and improving delivery
performance.
9. A company needs to protect a web application from common SQL injection
and cross-site scripting attacks. Which AWS service is designed for this
purpose?
A. AWS WAF
B. AWS Shield only
C. Amazon GuardDuty
D. AWS CloudTrail
Answer: AWS WAF
