SAP-C02 Continuous Improvement for Existing Solutions Practice Question
A company runs a web application on EC2 instances behind an Application Load Balancer (ALB). Users report intermittent 503 errors. The ALB target group health checks are failing. Which step is MOST likely to resolve the issue?
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
✓
Increase the health check timeout and decrease the unhealthy threshold.
Increasing the health check timeout gives instances more time to respond before being marked unhealthy, and decreasing the unhealthy threshold allows more consecutive failed health checks before considering an instance unhealthy, reducing false positives. Option A is incorrect because changing the protocol does not address the underlying cause of health check failures; it might even fail if the application does not support HTTPS. Option B is incorrect because using a Network Load Balancer does not resolve health check failures; NLB health checks are different but still need proper configuration. Option C is incorrect because simply increasing the number of instances does not fix the health check issue; instances may still fail health checks if they are not healthy.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Change the health check protocol from HTTP to HTTPS.
Why it's wrong here
Protocol change does not address timeout or threshold issues.
- ✗
Use a Network Load Balancer instead of ALB.
Why it's wrong here
NLB does not have application-layer health checks needed for HTTP errors.
- ✗
Increase the number of instances in the target group.
Why it's wrong here
Scaling does not fix health check configuration issues.
- ✓
Increase the health check timeout and decrease the unhealthy threshold.
Why this is correct
Gives instances more time to respond and reduces sensitivity to transient failures.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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