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An Auto Scaling group has MinSize=2, MaxSize=6, and DesiredCapacity=4. If a scale-out event requests 5 additional instances, how many instances will the group have after scaling?

medium📝 service behavior Q5 of 15
AWS - Auto Scaling
An Auto Scaling group has MinSize=2, MaxSize=6, and DesiredCapacity=4. If a scale-out event requests 5 additional instances, how many instances will the group have after scaling?
A9 instances
B4 instances
C5 instances
D6 instances
Step-by-Step Solution
Solution:
  1. Step 1: Calculate new DesiredCapacity after scale-out

    Current DesiredCapacity 4 plus 5 equals 9.
  2. Step 2: Check against MaxSize

    MaxSize is 6, so DesiredCapacity is capped at 6.
  3. Final Answer:

    6 instances -> Option D
  4. Quick Check:

    DesiredCapacity capped by MaxSize after scaling [OK]
Quick Trick: DesiredCapacity cannot exceed MaxSize after scaling [OK]
Common Mistakes:
MISTAKES
  • Ignoring MaxSize limit and expecting 9 instances
  • Adding scale-out amount incorrectly

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