PAS-C01 Design of SAP Workloads on AWS Practice Question
An SAP system on AWS is experiencing high CPU utilization on the application server during peak hours. The SAP administrator wants to add a new application server instance to distribute the load. Which AWS service should be used to automatically register the new instance with the existing SAP system's load balancer?
⚠ Common exam trap
Candidates often confuse Auto Scaling groups with CloudFormation, thinking that CloudFormation can dynamically register instances, but CloudFormation is a provisioning tool that does not handle real-time auto-registration of instances with a load balancer.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Auto Scaling group
An Auto Scaling group can automatically launch new EC2 instances based on scaling policies (e.g., when CPU utilization exceeds a threshold) and, when configured with a lifecycle hook or a launch template that includes a user-data script, can register the new instance with the existing SAP system's load balancer (such as an Application Load Balancer or Classic Load Balancer). This ensures the new application server is automatically added to the load balancer target group, distributing incoming traffic without manual intervention.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Auto Scaling group
Why this is correct
Auto Scaling can automatically register new instances with a load balancer.
- ✗
AWS Lambda
Why it's wrong here
Lambda is for serverless functions.
- ✗
Amazon SQS
Why it's wrong here
SQS is a message queue service.
- ✗
AWS CloudFormation
Why it's wrong here
CloudFormation is for provisioning resources, not automatic scaling.
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