The answer is that the application is not using the ElastiCache cluster for session storage, which directly explains why users are logged out after deployment. When a stateless web application on EC2 instances is supposed to store session data in ElastiCache Redis but instead defaults to local instance memory, any scaling event or instance replacement in the Auto Scaling group destroys those sessions, forcing users to re-authenticate. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of stateless architecture patterns and the critical role of external session stores—a common trap is assuming the Auto Scaling group or load balancer is misconfigured when the real issue is that the application code simply isn’t pointing to the Redis cluster. Remember the memory tip: “If users are bounced, check where sessions are trounced”—always verify the application’s session storage endpoint before blaming scaling or health checks.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 is running a stateless web application on Amazon EC2 instances in an Auto Scaling group. The application stores session data in an Amazon ElastiCache Redis cluster. After a recent deployment, users are being logged out frequently. 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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The application is not using the ElastiCache cluster for session storage.
Option B is correct because if the application is not properly configured to use the ElastiCache cluster, session data may be lost on instance replacement or scaling events. Option A is wrong because the Auto Scaling group is configured, but the issue is session persistence. Option C is wrong because health checks do not affect session data. Option D is wrong because the ALB is not causing logout; the issue is session storage.
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 Auto Scaling group's min size is too small.
Why it's wrong here
Min size affects capacity but not session persistence; users would still be logged out if sessions are not stored externally.
✗
The Elastic Load Balancer's health check is too aggressive.
Why it's wrong here
Health checks cause instance replacement but should not affect sessions if stored externally.
✓
The application is not using the ElastiCache cluster for session storage.
Why this is correct
If sessions are stored locally on EC2 instances, they are lost when instances are terminated or scaled, causing logouts.
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 ElastiCache cluster's security group is blocking traffic from the ALB.
Why it's wrong here
The ALB does not need to access ElastiCache; the EC2 instances do. If blocked, the app would fail entirely, not just logouts.
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 SAP-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.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The application is not using the ElastiCache cluster for session storage. — Option B is correct because if the application is not properly configured to use the ElastiCache cluster, session data may be lost on instance replacement or scaling events. Option A is wrong because the Auto Scaling group is configured, but the issue is session persistence. Option C is wrong because health checks do not affect session data. Option D is wrong because the ALB is not causing logout; the issue is session storage.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-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.
About these practice questions
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 →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This SAP-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 SAP-C02 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.