- A
The security groups for the application servers do not allow traffic from the ALB.
Why wrong: If security groups blocked traffic, the health checks would fail and instances would be unhealthy.
- B
The SSL certificate on the ALB has expired.
Why wrong: Expired SSL would cause TLS errors, not necessarily 503.
- C
The target group health checks are misconfigured, marking instances as healthy when they are not.
Why wrong: The team already checked and found instances healthy; health check misconfiguration would show unhealthy instances.
- D
The ALB connection draining timeout is set too low, causing requests to be routed to instances that are being de-registered.
Connection draining ensures in-flight requests complete, but if timeout is too short, requests may fail.
Quick Answer
The answer is a misconfigured connection draining timeout on the ALB. When the connection draining timeout is set too low, the load balancer stops sending new requests to an instance that is being de-registered before existing connections have time to complete, but it may still route a small number of new requests to that instance during the brief draining window, causing those requests to fail with HTTP 503 errors. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of how ALB connection draining interacts with SAP application server lifecycle events, such as rolling updates or scaling activities. A common trap is assuming that healthy target groups guarantee no 503s, but the issue is timing—requests hit an instance that is technically healthy but no longer accepting traffic. Remember the memory tip: “Draining too fast leaves requests in the past.”
PAS-C01 Operations and Maintenance Practice Question
This PAS-C01 practice question tests your understanding of operations and maintenance. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company runs SAP Business Suite on AWS. The SAP application servers are behind an Application Load Balancer (ALB). The operations team notices that occasionally, some requests fail with HTTP 503 errors. The team checks the ALB and finds that the target group has healthy instances. The SAP application logs show no errors. What is the most likely cause of the 503 errors?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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 ALB connection draining timeout is set too low, causing requests to be routed to instances that are being de-registered.
Option A is correct. If the ALB connection draining timeout is too short, the ALB may send requests to instances that are being de-registered, resulting in 503 errors. Option B is wrong because if instances were unhealthy, the ALB would not route traffic to them. Option C is wrong because SSL issues would cause other errors, not necessarily 503. Option D is wrong because security group misconfigurations would typically cause connection timeouts, not 503 errors.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 security groups for the application servers do not allow traffic from the ALB.
Why it's wrong here
If security groups blocked traffic, the health checks would fail and instances would be unhealthy.
- ✗
The SSL certificate on the ALB has expired.
Why it's wrong here
Expired SSL would cause TLS errors, not necessarily 503.
- ✗
The target group health checks are misconfigured, marking instances as healthy when they are not.
Why it's wrong here
The team already checked and found instances healthy; health check misconfiguration would show unhealthy instances.
- ✓
The ALB connection draining timeout is set too low, causing requests to be routed to instances that are being de-registered.
Why this is correct
Connection draining ensures in-flight requests complete, but if timeout is too short, requests may fail.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
The team already checked and found instances healthy; health check misconfiguration would show unhealthy instances.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Identify which PAS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Operations and Maintenance — study guide chapter
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Operations and Maintenance — This question tests Operations and Maintenance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The ALB connection draining timeout is set too low, causing requests to be routed to instances that are being de-registered. — Option A is correct. If the ALB connection draining timeout is too short, the ALB may send requests to instances that are being de-registered, resulting in 503 errors. Option B is wrong because if instances were unhealthy, the ALB would not route traffic to them. Option C is wrong because SSL issues would cause other errors, not necessarily 503. Option D is wrong because security group misconfigurations would typically cause connection timeouts, not 503 errors.
What should I do if I get this PAS-C01 question wrong?
Identify which PAS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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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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