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A solutions architect is developing a multiple-subnet VPC architecture. The solution will consist of six subnets in two Availability Zones. The subnets are defined as public, private and dedicated for databases. Only the Amazon EC2 instances running in the private subnets should be able to access a database. Which solution meets these requirements?
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A company is implementing a new application on AWS. The company will run the application on multiple Amazon EC2 instances across multiple Availability Zones within multiple AWS Regions. The application will be available through the internet. Users will access the application from around the world. The company wants to ensure that each user who accesses the application is sent to the EC2 instances that are closest to the user's location. Which solution will meet these requirements?
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Question 756 - SAA-C03 discussion

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A company's application is deployed on Amazon EC2 instances and uses AWS Lambda functions for an event-driven architecture. The company uses nonproduction development environments in a different AWS account to test new features before the company deploys the features to production.

The production instances show constant usage because of customers in different time zones. The company uses nonproduction instances only during business hours on weekdays. The company does not use the nonproduction instances on the weekends. The company wants to optimize the costs to run its application on AWS.

Which solution will meet these requirements MOST cost-effectively?

A.
Use On-Demand Instances (or the production instances. Use Dedicated Hosts for the nonproduction instances on weekends only.
Answers
A.
Use On-Demand Instances (or the production instances. Use Dedicated Hosts for the nonproduction instances on weekends only.
B.
Use Reserved instances for the production instances and the nonproduction instances Shut down the nonproduction instances when not in use.
Answers
B.
Use Reserved instances for the production instances and the nonproduction instances Shut down the nonproduction instances when not in use.
C.
Use Compute Savings Plans for the production instances. Use On-Demand Instances for the nonproduction instances Shut down the nonproduction instances when not in use.
Answers
C.
Use Compute Savings Plans for the production instances. Use On-Demand Instances for the nonproduction instances Shut down the nonproduction instances when not in use.
D.
Use Dedicated Hosts for the production instances. Use EC2 Instance Savings Plans for the nonproduction instances.
Answers
D.
Use Dedicated Hosts for the production instances. Use EC2 Instance Savings Plans for the nonproduction instances.
Suggested answer: C

Explanation:

Compute Savings Plans offer the most flexible and cost-effective solution for the production instances, as they provide significant savings (up to 66%) for both EC2 and AWS Lambda usage, while allowing flexibility in the type of instance family, size, and even region. For nonproduction instances, using On-Demand Instances ensures you only pay for the instances when they are running, and shutting them down during off-hours further optimizes cost.

Key AWS features:

Compute Savings Plans: Provide savings based on consistent usage, making it ideal for production environments with steady load.

On-Demand Instances: Suitable for nonproduction environments that are used intermittently. Shutting them down when not in use avoids unnecessary costs.

AWS Documentation: According to AWS's cost optimization best practices, using a combination of Savings Plans for production and On-Demand Instances for nonproduction environments that are used sparingly results in optimal cost savings.

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asked 16/09/2024
Paulo Cury
33 questions
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