PAS-C01 Technology Practice Question
A company is running a stateful application on EC2 instances in an Auto Scaling group. The instances store session state locally. The group uses a simple scaling policy based on network traffic. The company notices that when instances are terminated during scale-in, active sessions are lost. What is the MOST effective way to preserve session state during scaling events?
⚠ Common exam trap
Test-takers frequently confuse termination protection (which prevents manual termination) with lifecycle hooks (which manage the termination process), or they mistakenly believe that scaling policy types or cooldowns can influence session state preservation.
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 a lifecycle hook to gracefully drain sessions before instance termination.
A lifecycle hook is the most effective solution because it pauses the instance termination process during scale-in, allowing the application to drain active sessions (e.g., by transferring session state to a shared data store like ElastiCache or DynamoDB) before the instance is fully terminated. This preserves session continuity without requiring architectural changes to the application's stateful design.
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 a step scaling policy instead of a simple scaling policy.
Why it's wrong here
Step scaling does not affect session preservation.
- ✓
Use a lifecycle hook to gracefully drain sessions before instance termination.
Why this is correct
Lifecycle hooks allow instances to perform custom actions before being terminated.
- ✗
Increase the cooldown period for the Auto Scaling group.
Why it's wrong here
Cooldown delays scaling but does not preserve sessions.
- ✗
Use a launch configuration that enables termination protection.
Why it's wrong here
Termination protection prevents termination but does not help preserve sessions when scale-in is needed.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PAS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PAS-C01 exam.