The answer is to use Amazon ElastiCache for Redis as a centralized session state store. This is correct because ElastiCache Redis provides a low-latency, highly available, and scalable external cache that decouples session data from individual web servers, allowing Auto Scaling to add or remove instances without losing user sessions. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of stateless architecture patterns and the trade-offs between sticky sessions (ELB stickiness) and a dedicated session store; the common trap is choosing sticky sessions, which creates a fragile dependency on specific instances and hinders elastic scaling. Remember that for any Auto Scaling architecture, session state must live outside the compute layer, and Redis excels at this with sub-millisecond performance. Memory tip: “Stateless scales, sticky fails” — if you see Auto Scaling, always push session data to ElastiCache, not the web tier.
SAP-C02 Practice Question: Accelerate Workload Migration and Modernization
This SAP-C02 practice question tests your understanding of accelerate workload migration and modernization. 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 company is migrating a legacy e-commerce application to AWS. The application includes a web tier, an application tier, and a MySQL database. The company wants to improve scalability and reduce operational overhead. The architect plans to use Amazon RDS for MySQL and refactor the application to use Auto Scaling for the web and application tiers. However, the application currently stores session state locally on the web servers. What should the architect do to address session state management in the new architecture?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Amazon ElastiCache for Redis to store session state
Using ElastiCache for Redis provides a centralized, scalable session store that works with Auto Scaling. Using sticky sessions (ELB session stickiness) is a workaround but less scalable and not recommended for Auto Scaling. Storing sessions in RDS would add database load. Storing in S3 is not suitable for low-latency session access.
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.
✗
Store session state in Amazon S3
Why it's wrong here
S3 has higher latency and is not designed for session storage.
✗
Store session state in Amazon RDS for MySQL
Why it's wrong here
RDS is not optimized for high-frequency session reads/writes and could become a bottleneck.
✗
Configure an Application Load Balancer with sticky sessions
Why it's wrong here
Sticky sessions can work but limit scalability and are not best practice for Auto Scaling.
✓
Use Amazon ElastiCache for Redis to store session state
Why this is correct
ElastiCache provides a fast, scalable, and centralized session store.
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 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.
Accelerate Workload Migration and Modernization — This question tests Accelerate Workload Migration and Modernization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Amazon ElastiCache for Redis to store session state — Using ElastiCache for Redis provides a centralized, scalable session store that works with Auto Scaling. Using sticky sessions (ELB session stickiness) is a workaround but less scalable and not recommended for Auto Scaling. Storing sessions in RDS would add database load. Storing in S3 is not suitable for low-latency session access.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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
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