Cost optimization pillar in AWS - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Cost Optimization Principles

Which of the following best describes the primary goal of the Cost Optimization pillar in cloud architecture?

A Minimize cost while maintaining performance and reliability

B Maximize resource usage without considering cost

C Focus only on reducing upfront capital expenses

D Avoid using any managed cloud services to save money

💡 Hint

Think about balancing cost with service quality.

The Cost Optimization pillar aims to reduce costs while ensuring the system remains performant and reliable. Simply cutting costs without considering impact is not the goal.

❓ Architecture

intermediate

Choosing the Right Storage Class for Cost Savings

You have a data archive that is rarely accessed but must be retained for years. Which AWS storage class is the most cost-effective choice?

A Amazon S3 Intelligent-Tiering

B Amazon S3 Standard

C Amazon S3 Glacier Deep Archive

D Amazon EBS General Purpose SSD

💡 Hint

Consider storage classes designed for long-term, infrequent access.

Amazon S3 Glacier Deep Archive is the lowest-cost storage class for long-term data archiving with infrequent access.

❓ security

advanced

Impact of Cost Optimization on Security

Which cost optimization approach can unintentionally increase security risks in a cloud environment?

A Disabling automated security updates to save costs

B Implementing auto-scaling to match demand

C Using reserved instances for predictable workloads

D Using spot instances for non-critical batch jobs

💡 Hint

Think about what happens if security updates are not applied.

Disabling automated security updates to save money can leave systems vulnerable to attacks, increasing security risks.

❓ service_behavior

advanced

Effect of Auto Scaling on Cost Optimization

How does enabling auto scaling in AWS help optimize costs?

A It keeps all instances running at all times to avoid delays

B It increases instance size to handle peak loads continuously

C It disables unused instances permanently to save cost

D It automatically adjusts the number of instances based on demand

💡 Hint

Consider how resources match workload changes.

Auto scaling adjusts the number of instances dynamically, so you pay only for what you need, reducing waste.

✅ Best Practice

expert

Implementing Cost Allocation Tags

You want to track cloud costs by department and project. Which practice ensures accurate cost allocation in AWS?

A Tag only the resources with the highest cost

B Use cost allocation tags consistently on all resources

C Apply tags randomly to some resources to save time

D Avoid tagging to reduce management overhead

💡 Hint

Think about how to get clear cost reports per group.

Consistent use of cost allocation tags on all resources allows detailed and accurate cost tracking by department and project.