Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 405 discussion

What does "ALB capacity" even means anyway? It should be "Target Group capacity" no? Answer should be DE, as D is a more comprehensive answer (and more practical in real life)

Not A - "AWS Auto Scaling" cannot adjust "ALB capacity" (https://aws.amazon.com/autoscaling/faqs/) Not B - VPC internet gateway has nothing to do with this Not C - Regions have nothing to do with scaling "The system will experience significant increases in traffic during working hours" -> addressed by D "But is not required to operate on weekends" -> addressed by E

AD E - the question doesn't ask about cost. Also, shutting it down during the weekend does nothing to improve scaling during the week. It doesn't address the requirements.

The solutions architect should take actions D and E: D) Use a target tracking scaling policy to scale the Auto Scaling group based on instance CPU utilization. This will allow the Auto Scaling group to dynamically scale in and out based on demand. E) Use scheduled scaling to change the Auto Scaling group capacity to zero on weekends when traffic is expected to be low. This will minimize costs by terminating unused instances.

Basado en los requerimientos la opción que se requiere para optimizar los costos de 0 operaciones en los fines de semana

DE - This seems more close for the auto scaling - A - Its says auto scaling on ALB, but it should always be on EC2 instances and not ELB

Hi guys, very simple * A. because the question are asking abount request rate!!!! This is a requirement! * E. The weekend is not necessary to execute anything! A&D. Is not possible, way you can put an ALB capacity based in cpu and in request rate???? You need to select one or another option (and this is for all questions here guys!)

ALBRequestCountPerTarget—Average Application Load Balancer request count per target. https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-scaling-target-tracking.html#target-tracking-choose-metrics It is possible to set to zero. "is not required to operate on weekends" means the instances are not required during the weekends. https://docs.aws.amazon.com/autoscaling/ec2/userguide/asg-capacity-limits.html

Option E is incorrect because the question specifically mentions an increase in traffic during working hours. Therefore, it is not advisable to schedule the instances for 24 hours using default settings throughout the entire week. E. Use scheduled scaling to change the Auto Scaling group minimum, maximum, and desired capacity to zero for weekends. Revert to the default values at the start of the week.

AD are the correct answs

Either one or two or all of these combinations will meet the need: Use AWS Auto Scaling to adjust the ALB capacity based on request rate. Use a target tracking scaling policy to scale the Auto Scaling group based on instance CPU utilization. Use scheduled scaling to change the Auto Scaling group minimum, maximum, and desired capacity to zero for weekends. Revert to the default values at the start of the week.

https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-scaling-target-tracking.html#target-tracking-choose-metrics Based on docs, ASG can't track ALB's request rate, so the answer is D&E meanwhile ASG can track CPU rates.

Scaling should be at the ASG not ALB. So, not sure about "Use AWS Auto Scaling to adjust the ALB capacity based on request rate"

A. Use AWS Auto Scaling to adjust the ALB capacity based on request rate: This will allow the system to scale up or down based on incoming traffic demand. The solutions architect should use AWS Auto Scaling to monitor the request rate and adjust the ALB capacity as needed. D. Use a target tracking scaling policy to scale the Auto Scaling group based on instance CPU utilization: This will allow the system to scale up or down based on the CPU utilization of the EC2 instances in the Auto Scaling group. The solutions architect should use a target tracking scaling policy to maintain a specific CPU utilization target and adjust the number of EC2 instances in the Auto Scaling group accordingly.

A. Use a target tracking scaling policy to scale the Auto Scaling group based on instance CPU utilization. This approach allows the Auto Scaling group to automatically adjust the number of instances based on the specified metric, ensuring that the system can scale to meet demand during working hours. D. Use scheduled scaling to change the Auto Scaling group minimum, maximum, and desired capacity to zero for weekends. Revert to the default values at the start of the week. This approach allows the Auto Scaling group to reduce the number of instances to zero during weekends when traffic is expected to be low. It will help the organization to save costs by not paying for instances that are not needed during weekends. Therefore, options A and D are the correct answers. Options B and C are not relevant to the scenario, and option E is not a scalable solution as it would require manual intervention to adjust the group capacity every week.

This is why I don't believe A is correct use auto scaling to adjust the ALB .... D&E

AD D there is no requirement for cost minimization in the scenario therefore, A & D are the answers