An App Service app must scale to 20 instances during peak but billing shows it caps at 10. What's the limiting factor?
A.The App Service plan's tier defines the maximum instance count
Plan tier sets the ceiling — correct, the 'which layer controls scale' distinction.
B.The subscription quota — it must be raised
Quota issues exist but the standard exam answer is plan-tier limits.
C.Autoscale can't exceed 10 by design
Autoscale goes to the plan max; no arbitrary 10-instance rule.
D.The app's deployment slot count
Slots are for deployment — unrelated to scaling.
Why this answer
The App Service plan (not the app) defines compute tier and scale limits — e.g., Basic caps at 3, Standard at 10, Premium higher. To scale beyond the tier limit you change the PLAN SKU, not app settings.
Correct answer: A · Last reviewed 2026-02-14
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