SOA-C02 Question 56
Select 3You are managing a web application hosted on AWS that experiences unpredictable traffic patterns. To ensure the application can handle sudden spikes in traffic while optimizing costs, you need to implement a scalable and elastic solution. Which combination of actions meets this requirement?
- A
Configure an Auto Scaling group with dynamic scaling policies based on CPU utilization metrics.
- B
Use an Application Load Balancer to distribute traffic across multiple EC2 instances.
- C
Modify the instance type of your EC2 instances to larger sizes to handle traffic spikes.
- D
Set up Amazon RDS in a Multi-AZ deployment to ensure high availability.
- E
Enable Elastic Load Balancing with an Auto Scaling group to manage traffic and automatically adjust capacity.
Show answer and explanation
Correct answers: A, B, E
Explanation
To implement scalability and elasticity for a web application with unpredictable traffic patterns, you need to use services that can dynamically adjust resources based on demand. Configuring an Auto Scaling group with dynamic scaling policies allows for automated instance management, while an Application Load Balancer ensures efficient traffic distribution. Enabling Elastic Load Balancing with Auto Scaling combines these features for a comprehensive solution. Modifying instance types manually is not scalable, and Multi-AZ RDS, while important for availability, does not address scalability and elasticity for the web application tier.
- A. Correct.
Configuring an Auto Scaling group with dynamic scaling policies ensures that the number of EC2 instances can automatically increase or decrease based on CPU utilization, enabling scalability and elasticity.
- B. Correct.
Using an Application Load Balancer allows you to distribute traffic evenly across multiple EC2 instances, improving fault tolerance and optimizing resource utilization.
- C. Incorrect.
Modifying the instance type to a larger size is not a scalable or elastic solution, as it requires manual intervention and does not dynamically adjust to traffic patterns.
- D. Incorrect.
While setting up Amazon RDS in a Multi-AZ deployment ensures high availability for your database, it does not directly contribute to the scalability and elasticity of your web application.
- E. Correct.
Enabling Elastic Load Balancing with an Auto Scaling group provides an integrated approach to handling traffic spikes and automatically adjusts application capacity based on demand, ensuring scalability and elasticity.