SAP-C02 Design for New Solutions Practice Question
A company runs a web application on Amazon EC2 instances behind an Application Load Balancer (ALB). They want to implement a blue/green deployment strategy with minimal impact on users. Which approach should they use?
⚠ Common exam trap
Many exam-takers confuse blue/green deployment with rolling updates or assuming that a new ALB and DNS change are required, when in fact ALB listener rule modifications provide immediate traffic switching without DNS propagation delays.
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
✓
Create a new target group with the green instances. Modify the ALB listener rule to forward traffic to the new target group.
Blue/green deployment with an ALB is achieved by creating a new target group for the green instances and modifying the ALB listener rule to forward traffic to the new target group. This allows instant traffic shifting with zero downtime, as the ALB can route traffic between target groups without changing the DNS or creating a new ALB. The blue (old) target group remains available for instant 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.
- ✓
Create a new target group with the green instances. Modify the ALB listener rule to forward traffic to the new target group.
Why this is correct
This is the standard blue/green deployment with ALB.
- ✗
Stop all instances, launch new instances with the new version, and update the target group.
Why it's wrong here
This causes downtime.
- ✗
Update the existing target group's instances to the new version, one at a time.
Why it's wrong here
This is a rolling update, not blue/green.
- ✗
Create a new ALB and update DNS to point to the new ALB.
Why it's wrong here
This is a manual cutover, not seamless.
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