CLF-C02 Question 181
Select 3A company is launching a new web application and expects a high volume of traffic from multiple regions. They want to ensure the application remains highly available and can automatically distribute incoming requests to multiple servers. Which of the following are purposes of using an AWS Elastic Load Balancer (ELB) in this scenario?
- A
Distribute incoming traffic across multiple targets, such as EC2 instances, in one or more Availability Zones.
- B
Automatically scale up EC2 instances based on the incoming traffic.
- C
Provide a single point of contact for clients to access the application.
- D
Perform health checks on registered targets to route traffic only to healthy instances.
- E
Encrypt data at rest in the backend storage.
Show answer and explanation
Correct answers: A, C, D
Explanation
AWS Elastic Load Balancers are designed to improve the availability and fault tolerance of applications by distributing traffic across multiple targets, providing a unified access point, and ensuring only healthy targets receive traffic. These features make ELB a critical component for highly available and scalable architectures, but it does not handle tasks like scaling EC2 instances or encrypting data at rest.
- A. Correct.
Correct: One of the main purposes of a load balancer is to distribute incoming traffic across multiple targets, such as EC2 instances, to ensure availability and fault tolerance.
- B. Incorrect.
Incorrect: While Auto Scaling works with load balancers, the load balancer itself does not handle scaling up or down. This is managed by Auto Scaling Groups.
- C. Correct.
Correct: A load balancer provides a single point of access for clients to interact with the application, simplifying the architecture and improving user experience.
- D. Correct.
Correct: Elastic Load Balancers perform health checks on registered targets and route traffic only to healthy instances, ensuring reliability and consistent performance.
- E. Incorrect.
Incorrect: Encrypting data at rest is not a purpose of a load balancer. This is typically handled by storage services like EBS or S3.