The answer is to store session data in Amazon ElastiCache for Redis. This is correct because decoupling session state from individual web servers is essential for handling session state in highly available AWS architecture; ElastiCache provides a centralized, in-memory data store that all application instances can access, enabling true horizontal scaling and eliminating the single point of failure inherent in local file-based sessions. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of stateless application design versus sticky sessions—a common trap is assuming an Application Load Balancer with session affinity is sufficient, but that actually reduces availability by tying users to specific instances. Remember that ElastiCache for Redis is purpose-built for sub-millisecond session reads and writes, making it far faster than shared storage like EFS. Memory tip: “Cache the session, not the server.”
SAP-C02 Practice Question: Accelerate Workload Migration and Modernization
This SAP-C02 practice question tests your understanding of accelerate workload migration and modernization. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 PHP application running on a single on-premises server to AWS. The application stores session data locally on the server's filesystem. The company wants to achieve high availability and elasticity for the application on AWS. What should the company do to handle session state 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
✓
Store session data in Amazon ElastiCache for Redis
Using ElastiCache for session storage decouples session state from individual servers, allowing the application to scale horizontally. Sticky sessions with an ALB ties a user to a specific instance, which reduces availability if that instance fails. Storing sessions on EFS is possible but slower than ElastiCache. Re-architecting to use Cognito is unnecessary 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.
✗
Configure an Application Load Balancer with sticky sessions enabled
Why it's wrong here
Sticky sessions reduce availability and are not a true HA solution.
✓
Store session data in Amazon ElastiCache for Redis
Why this is correct
Correct. ElastiCache provides a centralized, fast session store for distributed applications.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Amazon EFS to share the session files across multiple EC2 instances
Why it's wrong here
EFS supports shared storage but is slower and not designed for high-frequency session reads/writes.
✗
Refactor the application to use Amazon Cognito for session management
Why it's wrong here
Cognito is for user authentication, not session storage.
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: Store session data in Amazon ElastiCache for Redis — Using ElastiCache for session storage decouples session state from individual servers, allowing the application to scale horizontally. Sticky sessions with an ALB ties a user to a specific instance, which reduces availability if that instance fails. Storing sessions on EFS is possible but slower than ElastiCache. Re-architecting to use Cognito is unnecessary 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.
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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