Architecting on AWS Certification Architecting on AWS Certification Cost Optimization & Performance Efficiency

Question 1

Which EC2 purchasing option offers up to 90% discount compared to On-Demand pricing in exchange for a flexible one- or three-year commitment to a specific instance family and Region?

Accepted Answer

Compute Savings Plans

Answer

Compute Savings Plans offer up to 66% savings (EC2 Instance Savings Plans up to 72%) by committing to a consistent compute usage ($/hour) for 1 or 3 years with flexibility across instance families, sizes, and Regions.

Question 2

Which S3 storage class is the most cost-effective for data that is accessed infrequently but must be retrieved within milliseconds?

Accepted Answer

S3 Standard-Infrequent Access

Answer

S3 Standard-IA offers lower storage costs than S3 Standard with millisecond retrieval, designed for data accessed less than once a month.

Question 3

An architect wants to right-size EC2 instances based on historical CPU and memory utilization. Which AWS service provides these recommendations?

Accepted Answer

AWS Compute Optimizer

Answer

AWS Compute Optimizer analyzes CloudWatch metrics and machine learning models to recommend optimal EC2 instance types based on actual utilization.

Question 4

Which caching strategy reduces database read load by storing frequently queried results in memory, improving application throughput and reducing cost?

Accepted Answer

All of the above are valid strategies

Answer

Write-through, read-through, and lazy-loading are all valid ElastiCache caching strategies that reduce database read pressure and improve performance.

Question 5

An application serves static assets globally. Which AWS service reduces latency for users worldwide by caching content at edge locations?

Accepted Answer

Amazon CloudFront

Answer

Amazon CloudFront is a CDN that caches content at 400+ Points of Presence globally, reducing origin load and delivering assets from the nearest edge location.

Architecting on AWS Certification Practice Test

Architecting on AWS Certification Practice Test

Architecting on AWS Certification Architecting on AWS Certification Cost Optimization & Performance Efficiency