Architecting on AWS Certification Cost Optimization & Performance Efficiency Flashcards
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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?
Answer: Compute Savings Plans
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.
Which S3 storage class is the most cost-effective for data that is accessed infrequently but must be retrieved within milliseconds?
Answer: S3 Standard-Infrequent Access
S3 Standard-IA offers lower storage costs than S3 Standard with millisecond retrieval, designed for data accessed less than once a month.
An architect wants to right-size EC2 instances based on historical CPU and memory utilization. Which AWS service provides these recommendations?
Answer: AWS Compute Optimizer
AWS Compute Optimizer analyzes CloudWatch metrics and machine learning models to recommend optimal EC2 instance types based on actual utilization.
Which caching strategy reduces database read load by storing frequently queried results in memory, improving application throughput and reducing cost?
Answer: All of the above are valid strategies
Write-through, read-through, and lazy-loading are all valid ElastiCache caching strategies that reduce database read pressure and improve performance.
An application serves static assets globally. Which AWS service reduces latency for users worldwide by caching content at edge locations?
Answer: Amazon CloudFront
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.
Which EC2 instance purchasing model is best suited for a batch processing workload that can tolerate interruptions in exchange for the lowest possible cost?
Answer: Spot Instances
EC2 Spot Instances use spare AWS capacity at up to 90% discount; they can be interrupted with a 2-minute warning, making them ideal for fault-tolerant batch jobs.