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Question 788 of 1,733

Technology →hardMultiple ChoiceObjective-mapped

PAS-C01 Technology Practice Question

This PAS-C01 practice question tests your understanding of technology. 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 has deployed SAP BusinessObjects (BO) on AWS using a multi-tier architecture with a Windows-based application server and a SQL Server database hosted on Amazon RDS. The application server is behind an Application Load Balancer (ALB) that handles HTTPS traffic. Users report that sometimes they receive a '502 Bad Gateway' error when accessing the BO web interface. The error occurs intermittently and is not reproducible on demand. The operations team checks the ALB logs and sees that the target response time occasionally exceeds 120 seconds. The BO application has a default timeout of 60 seconds. The team also notices that the ALB idle timeout is set to 60 seconds. What is the most likely cause of the 502 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.

A
Place an Amazon CloudFront distribution in front of the ALB to cache responses and reduce load.
Why wrong: CloudFront caching does not affect the ALB timeout; dynamic requests still go to the ALB and may still timeout.
B
Increase the max_connections parameter in the RDS SQL Server instance.
Why wrong: The 502 error is due to ALB timeout, not database connection limits.
C
Increase the idle timeout of the Application Load Balancer to 180 seconds.
The ALB request timeout (idle timeout) can be increased to accommodate longer application processing times, preventing premature connection closure.
D
Increase the deregistration delay on the ALB target group to 300 seconds.
Why wrong: The deregistration delay affects how long the ALB waits before removing a target from rotation, not request timeouts.

Full breakdown with real-world context →

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 idle timeout of the Application Load Balancer to 180 seconds.

The 502 errors occur because the ALB idle timeout (60 seconds) matches the BO application's default timeout (60 seconds), but the ALB logs show target response times occasionally exceed 120 seconds. When the ALB idle timeout expires before the backend completes its response, the ALB closes the connection and returns a 502 error. Increasing the ALB idle timeout to 180 seconds allows sufficient time for the backend to respond, preventing premature connection termination.

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.

✗
Place an Amazon CloudFront distribution in front of the ALB to cache responses and reduce load.
Why it's wrong here
CloudFront caching does not affect the ALB timeout; dynamic requests still go to the ALB and may still timeout.
✗
Increase the max_connections parameter in the RDS SQL Server instance.
Why it's wrong here
The 502 error is due to ALB timeout, not database connection limits.
✓
Increase the idle timeout of the Application Load Balancer to 180 seconds.
Why this is correct
The ALB request timeout (idle timeout) can be increased to accommodate longer application processing times, preventing premature connection closure.
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.
✗
Increase the deregistration delay on the ALB target group to 300 seconds.
Why it's wrong here
The deregistration delay affects how long the ALB waits before removing a target from rotation, not request timeouts.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is confusing the ALB idle timeout with the deregistration delay or database connection limits, leading candidates to choose options that address unrelated bottlenecks instead of the direct cause of the 502 error.

Detailed technical explanation

How to think about this question

The ALB idle timeout is defined per the HTTP keep-alive mechanism (RFC 7230), where the ALB waits for data from the target before closing the connection. When the backend application (SAP BO) takes longer than the idle timeout to generate a response, the ALB sends a TCP FIN to the client, resulting in a 502. In real-world scenarios, long-running BO reports or complex queries can cause response times to spike, and the default 60-second idle timeout is often insufficient for such workloads.

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.

TExam Day Tips

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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this PAS-C01 question test?

Technology — This question tests Technology — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Increase the idle timeout of the Application Load Balancer to 180 seconds. — The 502 errors occur because the ALB idle timeout (60 seconds) matches the BO application's default timeout (60 seconds), but the ALB logs show target response times occasionally exceed 120 seconds. When the ALB idle timeout expires before the backend completes its response, the ALB closes the connection and returns a 502 error. Increasing the ALB idle timeout to 180 seconds allows sufficient time for the backend to respond, preventing premature connection termination.

What should I do if I get this PAS-C01 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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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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.