SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 application that will run on Amazon EC2 instances behind an Application Load Balancer. The application needs to store session state. Which AWS service provides a fully managed, highly scalable solution for session state management?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon ElastiCache for Redis
Amazon ElastiCache for Redis is the correct choice because it provides a fully managed, in-memory data store that is ideal for session state management. Redis offers sub-millisecond latency, built-in replication, and automatic failover, making it highly scalable and durable for session data. The Application Load Balancer can be configured with stickiness (session affinity) to route requests to the same EC2 instance, but using ElastiCache for Redis decouples session state from the compute layer, enabling stateless application tiers and seamless scaling.
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.
✗
Amazon DynamoDB
Why it's wrong here
DynamoDB is a NoSQL database, but for session state, in-memory stores like Redis are more appropriate for low latency.
✓
Amazon ElastiCache for Redis
Why this is correct
ElastiCache for Redis is a fully managed, highly scalable, in-memory data store ideal for session state.
Related concept
Read the scenario before looking for a memorised answer.
✗
Amazon S3
Why it's wrong here
S3 is object storage and not designed for low-latency session state access.
✗
Amazon RDS for MySQL
Why it's wrong here
RDS is a relational database, which adds latency and overhead compared to in-memory caching.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Amazon DynamoDB because it is fully managed and scalable, but they overlook the fact that session state requires extremely low latency and automatic TTL expiration, which are native strengths of Redis but require additional configuration (e.g., DynamoDB TTL) and still cannot match Redis's in-memory performance.
Detailed technical explanation
How to think about this question
ElastiCache for Redis uses an in-memory data structure store with optional persistence to disk, allowing session data to be accessed in microseconds. Redis supports key expiration via the TTL command, which is critical for automatically cleaning up stale sessions without application-level garbage collection. In a real-world scenario, a high-traffic e-commerce site can use Redis with cluster mode enabled to shard session data across multiple nodes, achieving horizontal scalability and sub-millisecond response times even under millions of concurrent users.
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.
TExam Day Tips
→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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Amazon ElastiCache for Redis — Amazon ElastiCache for Redis is the correct choice because it provides a fully managed, in-memory data store that is ideal for session state management. Redis offers sub-millisecond latency, built-in replication, and automatic failover, making it highly scalable and durable for session data. The Application Load Balancer can be configured with stickiness (session affinity) to route requests to the same EC2 instance, but using ElastiCache for Redis decouples session state from the compute layer, enabling stateless application tiers and seamless scaling.
What should I do if I get this SAP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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