PAS-C01 Technology Practice Question
A company is running SAP BusinessObjects on AWS. The application servers are behind an Application Load Balancer (ALB). The ALB is configured to use a single target group. The company wants to deploy a new version of the application with zero downtime. Which deployment strategy should be used?
⚠ Common exam trap
Watch out — candidates often confuse a rolling update (which can cause brief downtime) with a blue/green deployment (which provides instant, zero-downtime cutover), especially when the question explicitly requires zero downtime and the ALB is already in place.
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
✓
Implement a blue/green deployment by creating a new target group and updating the ALB listener.
A blue/green deployment allows you to create a completely new target group with the new application version, then update the ALB listener rule to route all traffic from the existing target group to the new one. This ensures zero downtime because the switch is instantaneous at the listener level, and the old environment remains intact for immediate rollback if needed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Perform a rolling update by terminating one instance at a time and launching a new one.
Why it's wrong here
Rolling updates may cause temporary capacity loss.
- ✓
Implement a blue/green deployment by creating a new target group and updating the ALB listener.
Why this is correct
Blue/green allows instant traffic switch with no downtime.
- ✗
Create a new ALB and update the DNS record to point to the new ALB.
Why it's wrong here
DNS changes take time to propagate, causing potential downtime.
- ✗
Use a canary release by routing 10% of traffic to the new version.
Why it's wrong here
Canary release is not fully zero downtime if the old version is still in use.
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