A target group is a set of registered targets (like EC2 instances) that an Elastic Load Balancer routes traffic to.
The default load-balancing algorithm for an Application Load Balancer is round-robin.
No, CloudWatch alarms transition directly to ALARM when thresholds are breached; there is no WARNING state.
No, the FTP protocol is not supported by Amazon SNS for subscription endpoints.
An SNS Dead Letter Queue (DLQ) is used to store messages that couldn’t be successfully delivered to their subscribed endpoints for later analysis or reprocessing.