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You have an Auto Scaling group attached to an ELB. If you increase the desired capacity from 2 to 5, what will happen?

medium📝 service behavior Q5 of 15
AWS - Auto Scaling
You have an Auto Scaling group attached to an ELB. If you increase the desired capacity from 2 to 5, what will happen?
AELB immediately routes traffic to 5 instances without waiting for health checks.
BAuto Scaling ignores the change and keeps 2 instances running.
CAuto Scaling launches 3 new instances and ELB starts routing traffic to them once healthy.
DAuto Scaling terminates existing instances to maintain 2 instances.
Step-by-Step Solution
Solution:
  1. Step 1: Understand desired capacity effect

    Increasing desired capacity causes Auto Scaling to launch new instances to meet the target.
  2. Step 2: ELB routing behavior

    ELB routes traffic only to healthy instances after health checks pass.
  3. Final Answer:

    Auto Scaling launches 3 new instances; ELB routes traffic after health checks. -> Option C
  4. Quick Check:

    Desired capacity increase launches instances = C [OK]
Quick Trick: ELB routes only healthy new instances after launch [OK]
Common Mistakes:
  • Assuming ELB routes traffic before health checks
  • Thinking Auto Scaling ignores desired capacity changes
  • Believing Auto Scaling reduces instances on increase

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