The answer is to store session state in Amazon ElastiCache for Redis. This is the best choice because ElastiCache provides a highly available, in-memory data store external to any single EC2 instance, ensuring that session data persists and remains accessible even if an instance fails or is terminated during Auto Scaling events. By decoupling session state from compute, the application can scale seamlessly behind the Application Load Balancer, as any instance can retrieve the session from the shared Redis cluster. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of stateless architecture patterns and the trade-offs between managed services—a common trap is choosing instance-local storage or DynamoDB, but Redis is optimized for sub-millisecond reads and writes required for session state, while DynamoDB introduces latency and cost overhead for this use case. Memory tip: think “Redis for rapid reads” to remember that session state needs speed and fault tolerance, not a full database or object store.
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. 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 designing a new web application on AWS. The application must be highly available and scale automatically based on traffic. The architecture includes an Application Load Balancer (ALB) and an Auto Scaling group of EC2 instances. The application stores session state. What is the BEST way to handle session state to ensure high availability?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Store session state in Amazon ElastiCache for Redis
Option A is correct because ElastiCache for Redis provides a highly available, in-memory data store for session state that can be accessed by any instance. Option B is incorrect because storing session state on the instance itself is not fault-tolerant. Option C is incorrect because DynamoDB is a database, not optimized for session state. Option D is incorrect because S3 is object storage, not suitable for session state.
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 DynamoDB
Why it's wrong here
DynamoDB is a database, not optimized for session state.
✗
Store session state on the local instance store of each EC2 instance
Why it's wrong here
Instance store is ephemeral and not shared.
✗
Store session state in Amazon S3
Why it's wrong here
S3 is object storage, not suitable for session state.
✓
Store session state in Amazon ElastiCache for Redis
Why this is correct
ElastiCache provides a centralized, highly available session store.
Clue confirmation
The clue word "best" 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 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.
Design for New Solutions — This question tests Design for New Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Store session state in Amazon ElastiCache for Redis — Option A is correct because ElastiCache for Redis provides a highly available, in-memory data store for session state that can be accessed by any instance. Option B is incorrect because storing session state on the instance itself is not fault-tolerant. Option C is incorrect because DynamoDB is a database, not optimized for session state. Option D is incorrect because S3 is object storage, not suitable for session state.
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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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