PAS-C01 Operations and Maintenance Practice Question
This PAS-C01 practice question tests your understanding of operations and maintenance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Refer to the exhibit. An SAP administrator is configuring Route 53 to point a custom domain name to an Application Load Balancer (ALB) that fronts SAP Web Dispatchers. The record set is configured as shown. However, when users access sap.example.com, they receive a 503 error. What is the MOST likely cause?
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.
The EvaluateTargetHealth is set to true, which is causing the record to be marked as unhealthy.
Why wrong: EvaluateTargetHealth set to true is correct for alias records and does not directly cause a 503 error.
B
The security group for the ALB is not allowing inbound traffic on port 443 from the internet.
If the ALB security group blocks inbound HTTPS traffic from the internet, users cannot connect, resulting in a 503 error.
C
The Alias Target is incorrect; it should be the ALB's DNS name without 'dualstack'.
Why wrong: The alias target should include 'dualstack' to support both IPv4 and IPv6; omitting it would cause DNS resolution issues, not a 503.
D
The health check for the ALB target group is failing, causing Route 53 to return 503.
Why wrong: While a failing target group health check can cause a 503, the security group misconfiguration is a more common and likely cause given the scenario.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The security group for the ALB is not allowing inbound traffic on port 443 from the internet.
A 503 error from an ALB typically indicates that the ALB is not receiving traffic or that the target group is unhealthy. However, in this scenario, the correct answer is B: the security group for the ALB is not allowing inbound traffic on port 443 from the internet. Without that rule, the ALB cannot accept HTTPS requests, resulting in a 503. EvaluateTargetHealth being true (Option A) is a correct configuration for alias records and does not cause a 503. The Alias Target (Option C) is correctly set to the ALB's DNS name; 'dualstack' is part of that DNS name and is legitimate. A failing target group health check (Option D) would cause a 503, but the question specifies that users receive 503 when accessing the domain, and the most likely cause given the exhibit is the missing security group rule on the ALB.
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 EvaluateTargetHealth is set to true, which is causing the record to be marked as unhealthy.
Why it's wrong here
EvaluateTargetHealth set to true is correct for alias records and does not directly cause a 503 error.
✓
The security group for the ALB is not allowing inbound traffic on port 443 from the internet.
Why this is correct
If the ALB security group blocks inbound HTTPS traffic from the internet, users cannot connect, resulting in a 503 error.
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.
✗
The Alias Target is incorrect; it should be the ALB's DNS name without 'dualstack'.
Why it's wrong here
The alias target should include 'dualstack' to support both IPv4 and IPv6; omitting it would cause DNS resolution issues, not a 503.
✗
The health check for the ALB target group is failing, causing Route 53 to return 503.
Why it's wrong here
While a failing target group health check can cause a 503, the security group misconfiguration is a more common and likely cause given the scenario.
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
Scenario analysis trap
While a failing target group health check can cause a 503, the security group misconfiguration is a more common and likely cause given the scenario.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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.
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 security group for the ALB is not allowing inbound traffic on port 443 from the internet. — A 503 error from an ALB typically indicates that the ALB is not receiving traffic or that the target group is unhealthy. However, in this scenario, the correct answer is B: the security group for the ALB is not allowing inbound traffic on port 443 from the internet. Without that rule, the ALB cannot accept HTTPS requests, resulting in a 503. EvaluateTargetHealth being true (Option A) is a correct configuration for alias records and does not cause a 503. The Alias Target (Option C) is correctly set to the ALB's DNS name; 'dualstack' is part of that DNS name and is legitimate. A failing target group health check (Option D) would cause a 503, but the question specifies that users receive 503 when accessing the domain, and the most likely cause given the exhibit is the missing security group rule on the ALB.
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.
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Question Discussion
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