Microsoft Azure Developer Associate AZ-204 Practice Question
You are creating an Azure Functions app for a production workload. The function must avoid cold starts by keeping at least one instance warm, scale out automatically to thousands of concurrent executions when traffic spikes, integrate with an Azure Virtual Network for secure data access, and incur no per-execution billing charges. When configuring the hosting for the function app in the Azure portal, which hosting plan should you select?
The Azure Functions Premium plan keeps pre-warmed instances running to eliminate cold start, can automatically scale to many instances, supports VNet integration, and is billed by reserved instance core-seconds rather than individual executions. The Consumption plan also auto-scales but has cold starts, lacks VNet integration without NAT gateway, and charges per execution. An App Service (Dedicated) plan avoids per-execution costs but does not scale to zero and requires manual or rules-based scaling, making unexpected high concurrency expensive. The Elastic Premium (preview) option is synonymous with the Premium plan's capabilities but is not shown as a separate hosting choice in the portal; the appropriate selection remains the Premium plan.
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Microsoft Azure Developer Associate AZ-204
Develop Azure compute solutions
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