An Application Runs on Amazon EC2 Instances Across Multiple Availability

question 565

Multiple Choice

An application runs on Amazon EC2 instances across multiple Availability Zones. The instances run in an Amazon EC2 Auto Scaling group behind an Application Load Balancer. The application performs best when the CPU utilization of the EC2 instances is at or near 40%. What should a solutions architect do to maintain the desired performance across all instances in the group?

• A) Use a simple scaling policy to dynamically scale the Auto Scaling group.
• B) Use a target tracking policy to dynamically scale the Auto Scaling group.
• C) Use an AWS Lambda function to update the desired Auto Scaling group capacity.
• D) Use scheduled scaling actions to scale up and scale down the Auto Scaling group.

Apply sensitivity analysis to assess changes in assumptions.

Understand the concept and calculation of operating leverage.

Distinguish between fixed and variable costs and their roles in CVP analysis.

Understand the concept and application of cost volume profit (CVP) analysis in decision making.

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Definitions:

Net Present Value

A performance indicator for assessing an investment's profit, derived by taking away the current value of cash disbursements from the current value of cash incomes during a specific period.

Capital Expenditure

Funds used by a company to acquire or upgrade physical assets such as property, industrial buildings, or equipment.

Cash Inflows

The total amount of money being transferred into a business, typically measured within a specific time period.

Cash Outflows

Money that is spent or transferred out of a business, usually as a result of operational expenses, investments, or financing activities.