A Large Multinational Company Runs a Timesheet Application on AWS

question 133

Multiple Choice

A large multinational company runs a timesheet application on AWS that is used by staff across the world. The application runs on Amazon EC2 instances in an Auto Scaling group behind an Elastic Load Balancing (ELB) load balancer, and stores data in an Amazon RDS MySQL Multi-AZ database instance. The CFO is concerned about the impact on the business if the application is not available. The application must not be down for more than two hours, but he solution must be as cost-effective as possible. How should the Solutions Architect meet the CFO's requirements while minimizing data loss?

• A) In another region, configure a read replica and create a copy of the infrastructure. When an issue occurs, promote the read replica and configure as an Amazon RDS Multi-AZ database instance. Update the DNS record to point to the other region's ELB.
• B) Configure a 1-day window of 60-minute snapshots of the Amazon RDS Multi-AZ database instance. Create an AWS CloudFormation template of the application infrastructure that uses the latest snapshot. When an issue occurs, use the AWS CloudFormation template to create the environment in another region. Update the DNS record to point to the other region's ELB.
• C) Configure a 1-day window of 60-minute snapshots of the Amazon RDS Multi-AZ database instance which is copied to another region. Create an AWS CloudFormation template of the application infrastructure that uses the latest copied snapshot. When an issue occurs, use the AWS CloudFormation template to create the environment in another region. Update the DNS record to point to the other region's ELB.
• D) Configure a read replica in another region. Create an AWS CloudFormation template of the application infrastructure. When an issue occurs, promote the read replica and configure as an Amazon RDS Multi-AZ database instance and use the AWS CloudFormation template to create the environment in another region using the promoted Amazon RDS instance. Update the DNS record to point to the other region's ELB.

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Definitions:

Payback Period

The length of time required to recover the initial cost of an investment, highlighting the investment's risk and liquidity.

Modified Internal Rate

A version of the Internal Rate of Return (IRR) calculation that adjusts for changes in cash flows over the project's life, offering a more nuanced evaluation of profitability.

Discounting Approach

A financial strategy that determines the present value of future cash flows by applying a discount rate.

Discount Rate

It’s the interest rate used in the process of discounted cash flow analysis to evaluate the present value of anticipated future cash flows.