This CCSP practice question tests your understanding of cloud application security. 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 large enterprise is migrating a legacy .NET application to Azure App Service. The application currently stores session state in-memory on the web server. During the migration, the team plans to horizontally scale the application across multiple instances. The security team requires that session data remain confidential and be available even if an instance fails. Which solution should the team implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Azure Redis Cache to store session state with encryption enabled
Azure Redis Cache with encryption enabled provides a secure, centralized session store that persists data independently of individual web server instances. This ensures session data remains available even if an instance fails, and encryption protects confidentiality in transit and at rest, meeting the security team's requirements for horizontal 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.
✗
Store session data in Azure SQL Database with column-level encryption
Why it's wrong here
SQL Database works but is heavier; Redis is purpose-built for cache/session.
✓
Use Azure Redis Cache to store session state with encryption enabled
Why this is correct
Redis provides scalable, encrypted, persistent session storage independent of instances.
Related concept
Read the scenario before looking for a memorised answer.
✗
Encrypt session data and store it as a client-side cookie
Why it's wrong here
Client-side cookies can be tampered with and have size limits.
✗
Configure Application Gateway with cookie-based affinity (sticky sessions)
Why it's wrong here
Sticky sessions tie users to specific instances; if the instance fails, session is lost.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between availability and affinity, where candidates mistakenly choose sticky sessions (Option D) thinking they solve availability, but sticky sessions actually create a single point of failure by binding a user to one instance.
Detailed technical explanation
How to think about this question
Azure Redis Cache implements the Redis protocol with in-memory data structures, offering sub-millisecond read/write times ideal for session state. Encryption is enforced via TLS 1.2+ for data in transit and optional Azure Key Vault integration for at-rest encryption using AES-256. In a real-world scenario, ASP.NET's built-in RedisSessionStateProvider leverages this to serialize session objects into Redis hashes, allowing any instance to retrieve the session regardless of which instance originally handled the request, ensuring seamless failover.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
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.
Cloud Application Security — This question tests Cloud Application Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Azure Redis Cache to store session state with encryption enabled — Azure Redis Cache with encryption enabled provides a secure, centralized session store that persists data independently of individual web server instances. This ensures session data remains available even if an instance fails, and encryption protects confidentiality in transit and at rest, meeting the security team's requirements for horizontal scaling.
What should I do if I get this CCSP 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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