- A
Use Amazon CloudFront to cache session data at the edge.
Why wrong: CloudFront is not a session store.
- B
Use Amazon DynamoDB to store session data.
DynamoDB is a scalable, low-latency session store.
- C
Use Amazon S3 to store session data as objects.
Why wrong: S3 is not designed for low-latency session storage.
- D
Use ElastiCache for Redis to store session data externally.
ElastiCache for Redis is a common choice for session storage.
- E
Use Amazon EFS to store session data as files.
Why wrong: EFS is not designed for high-frequency session updates.
Question 649 of 1,750
Session Storage Options for Stateless AWS Applications
This DOP-C02 practice question tests your understanding of resilient cloud 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 runs a stateful web application on EC2 instances that store session data locally. They want to migrate to a stateless architecture for better resilience. Which TWO actions should they take?
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
✓
Use Amazon DynamoDB to store session data.
Option B is correct because DynamoDB provides a fully managed, low-latency, highly available NoSQL database that is ideal for storing session state externally. By moving session data to DynamoDB, the EC2 instances become stateless, allowing any instance to handle any request without relying on local storage, which improves resilience and scalability.
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.
- ✗
Use Amazon CloudFront to cache session data at the edge.
Why it's wrong here
CloudFront is not a session store.
- ✓
Use Amazon DynamoDB to store session data.
Why this is correct
DynamoDB is a scalable, low-latency session store.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use Amazon S3 to store session data as objects.
Why it's wrong here
S3 is not designed for low-latency session storage.
- ✓
Use ElastiCache for Redis to store session data externally.
Why this is correct
ElastiCache for Redis is a common choice for session storage.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use Amazon EFS to store session data as files.
Why it's wrong here
EFS is not designed for high-frequency session updates.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse stateless session storage with caching or file storage, incorrectly choosing S3 or EFS because they are persistent, while overlooking the need for low-latency, high-throughput, and consistent access that only DynamoDB or ElastiCache can provide.
Detailed technical explanation
How to think about this question
DynamoDB achieves single-digit millisecond latency for session reads and writes by using SSD-backed storage and automatic replication across three Availability Zones. ElastiCache for Redis stores session data in-memory, offering microsecond latency and built-in data structures like TTL-based key expiration, which is ideal for automatically cleaning up stale sessions. Both services support atomic operations (e.g., DynamoDB conditional writes, Redis transactions) to prevent race conditions in concurrent session updates.
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.
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Resilient Cloud Solutions — study guide chapter
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Amazon DynamoDB to store session data. — Option B is correct because DynamoDB provides a fully managed, low-latency, highly available NoSQL database that is ideal for storing session state externally. By moving session data to DynamoDB, the EC2 instances become stateless, allowing any instance to handle any request without relying on local storage, which improves resilience and scalability.
What should I do if I get this DOP-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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