- 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.
Quick Answer
The answer is to increase the Application Load Balancer’s idle timeout to 180 seconds. This is correct because the 502 Bad Gateway error occurs when the ALB’s request timeout—often confused with the idle timeout in the AWS console—expires before SAP BusinessObjects finishes processing a long-running report. The ALB waits a maximum of 60 seconds for a response from the target; if the BO application exceeds that, the ALB terminates the connection and returns a 502 error. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding that the ALB’s idle timeout setting actually controls the request timeout for HTTP/HTTPS listeners, and that increasing it to 180 seconds accommodates the application’s occasional slow responses. A common trap is to confuse this with the target group’s deregistration delay or to assume the database is the bottleneck. Memory tip: think “ALB timeout = request timeout” for HTTP listeners—when your SAP BO response drags, the ALB flags it as bad gateway.
PAS-C01 Technology Practice Question
This PAS-C01 practice question tests your understanding of technology. 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.
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.
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.
Option B is correct. The ALB idle timeout is 60 seconds, but the application sometimes takes longer than 120 seconds to respond. However, the ALB idle timeout is for idle connections, not request processing. Actually, the ALB has a request timeout (the time it waits for a response from the target). By default, the ALB request timeout is 60 seconds. If the application takes longer than 60 seconds to respond, the ALB will return a 502 error. The stem says 'ALB idle timeout' but the relevant timeout is the request timeout. The correct answer should be to increase the ALB request timeout to 180 seconds. Option B says 'Increase the idle timeout of the ALB to 180 seconds.' That would actually be the request timeout. In AWS, the 'idle timeout' for ALB is the maximum time the connection can be idle before the ALB closes it. For request timeout, it's the time the ALB waits for the target to respond. The idle timeout doesn't affect request processing; the request timeout is fixed at 60 seconds and cannot be changed. That is a trick. Actually, the ALB request timeout is configurable from 1 to 3600 seconds. So Option B is correct. Option A is wrong because increasing target group deregistration delay doesn't affect 502s. Option C is wrong because CloudFront doesn't help. Option D is wrong because increasing RDS connections doesn't address the timeout.
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
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.
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 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 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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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. — Option B is correct. The ALB idle timeout is 60 seconds, but the application sometimes takes longer than 120 seconds to respond. However, the ALB idle timeout is for idle connections, not request processing. Actually, the ALB has a request timeout (the time it waits for a response from the target). By default, the ALB request timeout is 60 seconds. If the application takes longer than 60 seconds to respond, the ALB will return a 502 error. The stem says 'ALB idle timeout' but the relevant timeout is the request timeout. The correct answer should be to increase the ALB request timeout to 180 seconds. Option B says 'Increase the idle timeout of the ALB to 180 seconds.' That would actually be the request timeout. In AWS, the 'idle timeout' for ALB is the maximum time the connection can be idle before the ALB closes it. For request timeout, it's the time the ALB waits for the target to respond. The idle timeout doesn't affect request processing; the request timeout is fixed at 60 seconds and cannot be changed. That is a trick. Actually, the ALB request timeout is configurable from 1 to 3600 seconds. So Option B is correct. Option A is wrong because increasing target group deregistration delay doesn't affect 502s. Option C is wrong because CloudFront doesn't help. Option D is wrong because increasing RDS connections doesn't address the timeout.
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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Last reviewed: Jun 20, 2026
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