- A
Amazon EFS
Why wrong: EFS is a file system, not designed for low-latency session state access.
- B
Amazon ElastiCache for Redis
Redis is an in-memory data store that provides sub-millisecond latency and supports session management features.
- C
Amazon RDS for MySQL
Why wrong: RDS is a relational database with higher latency and overhead for session state.
- D
Amazon DynamoDB
Why wrong: DynamoDB is a NoSQL database with single-digit millisecond latency, but in-memory caching like Redis is faster for session state.
Question 132 of 1,746
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 ECS with Fargate launch type. The application needs to store session state that is shared across multiple tasks. The session data must be highly available and low-latency. Which AWS service should be used to store the session state?
Answer choices
Why each option matters
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 an in-memory data store with sub-millisecond latency, which is ideal for storing session state that must be shared across multiple ECS Fargate tasks. Redis supports data structures like hashes and strings that map directly to session data, and it offers built-in replication and automatic failover for high availability. This makes it a purpose-built solution for distributed session management in containerized applications.
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 EFS
Why it's wrong here
EFS is a file system, not designed for low-latency session state access.
- ✓
Amazon ElastiCache for Redis
Why this is correct
Redis is an in-memory data store that provides sub-millisecond latency and supports session management features.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon RDS for MySQL
Why it's wrong here
RDS is a relational database with higher latency and overhead for session state.
- ✗
Amazon DynamoDB
Why it's wrong here
DynamoDB is a NoSQL database with single-digit millisecond latency, but in-memory caching like Redis is faster for session state.
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 serverless and highly available, but they overlook that session state requires ultra-low latency that only an in-memory cache like Redis can provide, and DynamoDB's millisecond latency is not sufficient for high-throughput session management.
Detailed technical explanation
How to think about this question
Under the hood, Redis stores data entirely in RAM, allowing O(1) complexity for key-value lookups, and it supports session-specific features like Time-To-Live (TTL) for automatic expiration of stale sessions. In a real-world scenario, an e-commerce platform using ECS Fargate with multiple tasks behind an Application Load Balancer can use ElastiCache for Redis to ensure that a user's shopping cart remains consistent regardless of which task handles the request. The Redis replication group with Multi-AZ deployment provides automatic failover, ensuring session data persists even if a cache node fails.
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
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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Design for New Solutions — study guide chapter
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
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 an in-memory data store with sub-millisecond latency, which is ideal for storing session state that must be shared across multiple ECS Fargate tasks. Redis supports data structures like hashes and strings that map directly to session data, and it offers built-in replication and automatic failover for high availability. This makes it a purpose-built solution for distributed session management in containerized applications.
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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Last reviewed: Jul 4, 2026
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