A company wants to automatically distribute incoming traffic across multiple EC2 instances and, when some instances become unhealthy, route traffic only to the healthy instances. Which service is MOST suitable?
A question asking for the service that load-balances across multiple instances.
Elastic Load Balancing (ELB)
Correct. Elastic Load Balancing (ELB) is a service that automatically distributes incoming traffic across multiple targets (such as EC2 instances). It detects unhealthy instances through health checks and routes traffic only to healthy instances, improving availability and scalability.
Amazon S3
S3 is object storage.
It is not a load balancer that distributes traffic across multiple instances, so it is incorrect.
Amazon Route 53
Route 53 is a DNS service that performs name resolution and routing.
Its role differs from a load balancer that distributes incoming traffic directly to instances and routes by health check, so it is incorrect.
AWS IAM
IAM is a service that manages access permissions.
It is not a load balancer that distributes traffic, so it is incorrect.
“Distribute traffic across multiple instances” and “route by health check” point to Elastic Load Balancing (ELB). Combine it with Auto Scaling to build a highly available, scalable architecture.