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Question 524

A company is hosting an application on AWS for a project that will run for the next 3 years. The application consists of 20 Amazon EC2 On-Demand Instances that are registered in a target group for a Network Load Balancer (NLB). The instances are spread across two Availability Zones. The application is stateless and runs 24 hours a day, 7 days a week.

The company receives reports from users who are experiencing slow responses from the application. Performance metrics show that the instances are at 10% CPU utilization during normal application use. However, the CPU utilization increases to 100% at busy times, which typically last for a few hours.

The company needs a new architecture to resolve the problem of slow responses from the application.

Which solution will meet these requirements MOST cost-effectively?

Create an Auto Scaling group. Attach the Auto Scaling group to the target group of the NLB. Set the minimum capacity to 20 and the desired capacity to 28. Purchase Reserved Instances for 20 instances.

Create a Spot Fleet that has a request type of request. Set the TotalTargetCapacity parameter to 20. Set the DefaultTargetCapacityType parameter to On-Demand. Specify the NLB when creating the Spot Fleet.

Create a Spot Fleet that has a request type of maintain. Set the TotalTargetCapacity parameter to 20. Set the DefaultTargetCapacityType parameter to Spot. Replace the NLB with an Application Load Balancer.

Create an Auto Scaling group. Attach the Auto Scaling group to the target group of the NLB. Set the minimum capacity to 4 and the maximum capacity to 28. Purchase Reserved Instances for four instances.

Correct Answer: D

To address the problem of slow responses during high utilization periods, the most cost-effective solution is to create an Auto Scaling group with a minimum capacity of 4 and a maximum capacity of 28. This allows the application to scale up during busy times to handle the increased load and scale down during normal periods, saving costs. By purchasing Reserved Instances for the minimum number of instances (4), the company can further reduce costs as Reserved Instances are cheaper than On-Demand Instances. This ensures that the application is scalable and cost-efficient.

Discussion

AlagongOption: D

It should be D

kupo777

D D Since the CPU utilization of the instance is 10% during normal application use, a minimum capacity of 4 is required, which is the minimum configuration and most cost-effective.