- A
The deregistration delay value is too low, causing connections to be dropped during scaling events.
Why wrong: Affects draining, not sticky sessions.
- B
The ALB health check interval is too short, causing healthy instances to be marked unhealthy frequently.
Why wrong: Health checks do not remove cookies.
- C
Cross-zone load balancing is disabled, causing uneven traffic distribution.
Why wrong: Cross-zone balancing does not affect stickiness.
- D
The stickiness cookie expiration duration is set too low, causing the cookie to expire before the user's session ends.
Short cookie duration causes loss of stickiness.
Question 238 of 1,616
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 developer deploys an application on EC2 instances behind an Application Load Balancer (ALB). The application uses sticky sessions (session affinity) based on a cookie. Users report that they are intermittently logged out during their session. 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.
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 stickiness cookie expiration duration is set too low, causing the cookie to expire before the user's session ends.
Option D is correct because if the stickiness cookie expiration duration is set too low, the cookie will expire before the user's session ends, causing the load balancer to route the user to a different instance and losing session state. Option A is wrong because deregistration delay affects how long an instance remains in service during scaling events, but does not directly cause intermittent logouts during a session. Option B is wrong because a short health check interval might cause healthy instances to be marked unhealthy, but this would result in dropped connections, not specifically intermittent logouts due to session stickiness. Option C is wrong because cross-zone load balancing affects traffic distribution across zones, not session stickiness.
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 deregistration delay value is too low, causing connections to be dropped during scaling events.
Why it's wrong here
Affects draining, not sticky sessions.
- ✗
The ALB health check interval is too short, causing healthy instances to be marked unhealthy frequently.
Why it's wrong here
Health checks do not remove cookies.
- ✗
Cross-zone load balancing is disabled, causing uneven traffic distribution.
Why it's wrong here
Cross-zone balancing does not affect stickiness.
- ✓
The stickiness cookie expiration duration is set too low, causing the cookie to expire before the user's session ends.
Why this is correct
Short cookie duration causes loss of stickiness.
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.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which DVA-C02 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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Troubleshooting and Optimization — study guide chapter
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The stickiness cookie expiration duration is set too low, causing the cookie to expire before the user's session ends. — Option D is correct because if the stickiness cookie expiration duration is set too low, the cookie will expire before the user's session ends, causing the load balancer to route the user to a different instance and losing session state. Option A is wrong because deregistration delay affects how long an instance remains in service during scaling events, but does not directly cause intermittent logouts during a session. Option B is wrong because a short health check interval might cause healthy instances to be marked unhealthy, but this would result in dropped connections, not specifically intermittent logouts due to session stickiness. Option C is wrong because cross-zone load balancing affects traffic distribution across zones, not session stickiness.
What should I do if I get this DVA-C02 question wrong?
Identify which DVA-C02 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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Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 20, 2026
This DVA-C02 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 DVA-C02 exam.
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