Question 494 of 1,616
PAS-C01 Operations and Maintenance Practice Question
A company runs SAP on AWS and uses an Application Load Balancer (ALB) to distribute traffic to a fleet of EC2 instances running SAP Web Dispatcher. The ALB has a target group with health checks configured on port 8080. Recently, the operations team noticed that some instances are being deregistered due to health check failures. The instances are healthy and the Web Dispatcher is running. The health check response time is consistently below 2 seconds. What is the most likely cause?
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
✓
The health check interval is too short, causing the threshold to be exceeded.
A health check interval that is too short can cause the threshold to be exceeded even though the instances are healthy. If the interval is set very low, the ALB may send health checks more frequently than the instance can respond, leading to occasional timeouts or failures that accumulate and cross the unhealthy threshold. Option B is incorrect because the ALB health checks originate from the ALB's own subnet IPs, not from the internet, so a security group blocking internet traffic would not affect health checks. Option C is incorrect because memory exhaustion would typically cause application-level failures, not health check failures on port 8080 if Web Dispatcher is still running. Option D is incorrect because an incorrect health check path would cause all health checks to fail consistently, not just some instances intermittently.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The health check interval is too short, causing the threshold to be exceeded.
Why this is correct
The health check interval is too short, causing the threshold to be exceeded. When the interval is too short, the ALB sends health checks more frequently, and if the threshold is low, a temporary slow response can trigger a failure.
- ✗
The security group for the instances blocks inbound traffic from the internet.
Why it's wrong here
The security group for the instances blocks inbound traffic from the internet. This is incorrect because ALB health checks originate from the ALB's own IPs, not the internet. The security group must allow traffic from the ALB's subnet.
- ✗
The instances are running out of memory.
Why it's wrong here
The instances are running out of memory. This is unlikely because the health check response time is under 2 seconds, indicating the Web Dispatcher is responsive.
- ✗
The health check path is incorrect.
Why it's wrong here
The health check path is incorrect. If the path were incorrect, all health checks would fail consistently, not just some instances.
Visual reference
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Last reviewed: Jun 20, 2026
This PAS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PAS-C01 exam.
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