Horizontal scaling on AWS is best characterised as:
- Migrating the workload to S3 Glacier
- Adding more identical instances behind a load balancer to share traffic
- Switching all servers to a single AZ for simplicity
- Increasing the CPU and memory of a single existing EC2 instance
Show answer and solution
Correct answer: B. Adding more identical instances behind a load balancer to share traffic
Scale-out adds instances
vertical scale (scale-up) grows a single instance.
Glacier is archival storage
consolidating into one AZ removes resilience.