The answer is that ECS tasks are being replaced by the service scheduler during deployments or health checks, which causes the session data loss. This is correct because Fargate tasks are ephemeral by design—their local file system is temporary and destroyed whenever a task stops or is replaced. When the ECS service scheduler replaces a task during a rolling deployment or after a failed health check, any session state stored locally on that container is wiped out, forcing users to re-authenticate. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this question tests your understanding of stateless application design in containerized environments, a common trap being that sticky sessions (ALB) seem like a fix but cannot preserve data when the container itself disappears. The key takeaway is that Fargate’s ephemeral storage means you must offload session state to an external store like ElastiCache or DynamoDB. Memory tip: think “Fargate forgets files—offload or you’re logged out.”
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 runs a web application on Amazon ECS with Fargate launch type behind an Application Load Balancer. The application stores session state in a local file system on the container. Users report that they are frequently logged out and lose session data. 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
✓
ECS tasks are being replaced by the service scheduler during deployments or health checks.
Option B is correct because Fargate tasks are ephemeral; they can be replaced due to deployments or health checks, causing loss of local session data. Option A is wrong because ALB sticky sessions are irrelevant if the container itself is replaced. Option C is wrong because scaling out does not cause individual container replacement. Option D is wrong because the issue is about session persistence, not security groups.
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.
✓
ECS tasks are being replaced by the service scheduler during deployments or health checks.
Why this is correct
Fargate tasks are ephemeral; replacement causes loss of local session data.
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 security group for the ECS tasks is blocking inbound traffic from the ALB.
Why it's wrong here
This would cause connectivity issues, not session loss.
✗
The ECS service is configured to scale out, causing new tasks to be created without existing session data.
Why it's wrong here
Scaling out adds tasks, but existing tasks retain their data.
✗
The Application Load Balancer is not configured with sticky sessions.
Why it's wrong here
Sticky sessions would help if containers persist, but containers are being replaced.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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: ECS tasks are being replaced by the service scheduler during deployments or health checks. — Option B is correct because Fargate tasks are ephemeral; they can be replaced due to deployments or health checks, causing loss of local session data. Option A is wrong because ALB sticky sessions are irrelevant if the container itself is replaced. Option C is wrong because scaling out does not cause individual container replacement. Option D is wrong because the issue is about session persistence, not security groups.
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.
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Question Discussion
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