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

It provides a lower storage cost per GB

Answer

It replicates data to three Regions automatically

Answer

It eliminates the need for database backups

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 Budgets

Answer

AWS Pricing Calculator

Answer

AWS Trusted Advisor

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 Object Lock

Answer

S3 Replication

Answer

S3 Intelligent-Tiering

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 uses cheaper hardware than EC2

Answer

Lambda has free unlimited storage

Answer

Lambda instances are reserved and always cheaper

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 Config

Answer

AWS Systems Manager

Answer

AWS Well-Architected Tool

Question 6

An architect wants to reduce NAT Gateway data processing costs. Which design change could help for traffic that stays within AWS?

Accepted Answer

Use VPC Gateway Endpoints for S3 and DynamoDB to bypass NAT Gateway

Answer

Use S3 Transfer Acceleration instead

Answer

Enable VPC Flow Logs to identify top consumers

Answer

Switch to an Internet Gateway