CV0-004 Cloud Architecture and Design Practice Question
A company wants to migrate a stateful application to the cloud but needs to ensure it can scale horizontally. What architectural change is required?
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
✓
Move session state to a shared database or cache
Horizontal scaling requires stateless application design; sessions must be externalized to a shared data store.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Deploy in multiple availability zones
Why it's wrong here
Multi-AZ improves availability but does not alone enable horizontal scaling for stateful apps.
- ✓
Move session state to a shared database or cache
Why this is correct
Externalizing state allows any instance to handle any request, enabling horizontal scaling.
- ✗
Implement sticky sessions on the load balancer
Why it's wrong here
Sticky sessions bind a user to a specific instance, limiting horizontal scaling.
- ✗
Use larger instance types
Why it's wrong here
That is vertical scaling, not horizontal.
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Written by Johnson Ajibi, MSc IT Security
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