CV0-004 Operations and Support Practice Question
A cloud engineer is designing an auto-scaling solution for a stateful application. The scaling policy must ensure that instances are properly drained before termination and that new instances are fully initialized before receiving traffic. Which THREE features should be used? (Choose THREE.)
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
✓
Elastic Load Balancer target group health checks
Lifecycle hooks allow custom actions during scale-in (draining) and scale-out (initialization). Health checks ensure instances are healthy before receiving traffic. Cooldown periods prevent rapid scaling. Elastic Load Balancer target group ensures traffic distribution. CloudWatch alarms trigger scaling.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Scheduled scaling actions
Why it's wrong here
Scheduled scaling is for time-based scaling, not for lifecycle management.
- ✓
Elastic Load Balancer target group health checks
Why this is correct
Health checks ensure instances are healthy before receiving traffic from the load balancer.
- ✓
Auto-scaling group launch configurations with user data
Why this is correct
User data can run initialization scripts, and combined with lifecycle hooks, can ensure readiness.
- ✗
Cooldown periods
Why it's wrong here
Cooldown periods prevent frequent scaling but don't directly handle draining or initialization.
- ✓
Lifecycle hooks
Why this is correct
Lifecycle hooks enable custom actions during instance launch and termination, such as draining connections.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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