AWS Technical Essentials Practice

AWS offers a highly available architecture primarily through Elastic Load Balancing and Auto Scaling.

Elastic Load Balancing automatically distributes incoming application traffic across multiple targets, such as Amazon EC2 instances. This ensures that no single instance bears too much load, which enhances availability and fault tolerance. If one instance goes down or experiences high traffic, the load balancer can redirect traffic to other healthy instances without causing downtime for users.

Auto Scaling complements this by automatically adjusting the number of EC2 instances in response to changing traffic patterns. It can launch new instances when demand increases or terminate instances when demand decreases, optimizing resource usage and maintaining performance. This dynamic adjustment helps to ensure that applications are always running with the right number of resources to handle the current load, contributing to a highly available service.

In contrast, while other options may involve components that play roles in application architecture, they do not inherently provide the same level of built-in high availability that Elastic Load Balancing and Auto Scaling specifically offer. CloudFront and CloudWatch, for instance, are more focused on content delivery and monitoring, respectively, whereas Lambda and Batch Processing address different use cases in compute resource management. Elastic Beanstalk and ECS can help manage application deployments but do not focus primarily on high availability to the extent