Architecting on AWS Certification Architecting on AWS Certification Cost Optimization & Performance Efficiency 2

Question 1

What is the primary benefit of using Amazon Aurora Serverless v2 compared to a provisioned Aurora cluster for a variable-workload application?

Accepted Answer

It automatically scales compute capacity up and down based on demand, eliminating over-provisioning

Answer

Aurora Serverless v2 scales compute in fine-grained increments (0.5 ACU) almost instantly, so you pay only for the capacity used rather than provisioning for peak load.

Question 2

An architect needs to analyze AWS spending patterns and forecast future costs. Which AWS tool provides this capability?

Accepted Answer

AWS Cost Explorer

Answer

AWS Cost Explorer provides an interactive interface to visualize, understand, and forecast your AWS costs and usage over time with up to 12 months of historical data.

Question 3

Which S3 feature automatically transitions objects to cheaper storage classes based on their age, reducing long-term storage costs?

Accepted Answer

S3 Lifecycle Policies

Answer

S3 Lifecycle Policies define rules that automatically transition objects to lower-cost storage classes (e.g., Standard → IA → Glacier) or expire them based on object age.

Question 4

What is the advantage of using AWS Lambda over EC2 for event-driven, short-duration tasks from a cost optimization perspective?

Accepted Answer

Lambda bills in 1ms increments with no charge when idle, unlike EC2 which accrues cost while running

Answer

Lambda charges only for the compute time consumed during function execution (rounded to 1 ms), whereas EC2 charges per second/hour regardless of whether the instance is actively processing requests.

Question 5

Which AWS service provides recommendations to help you follow AWS best practices for cost, security, fault tolerance, and performance?

Accepted Answer

AWS Trusted Advisor

Answer

AWS Trusted Advisor inspects your AWS environment and provides real-time guidance to provision resources following AWS best practices across five categories.

Architecting on AWS Certification Practice Test

Architecting on AWS Certification Practice Test

Architecting on AWS Certification Architecting on AWS Certification Cost Optimization & Performance Efficiency 2