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AZ-305 · Question 40 · Domain 4.1: Compute Solutions
You are designing a serverless architecture using Azure Functions.
The function will be triggered by HTTP requests. The workload is highly variable, with long periods of inactivity followed by sudden, massive spikes in traffic.
The application has a strict requirement: the response time for the very first request after a period of inactivity must be under 500 milliseconds. Furthermore, the function needs to securely access resources inside an Azure Virtual Network.
Which Azure Functions hosting plan should you recommend?
You are designing a serverless architecture using Azure Functions.
The function will be triggered by HTTP requests. The workload is highly variable, with long periods of inactivity followed by sudden, massive spikes in traffic.
The application has a strict requirement: the response time for the very first request after a period of inactivity must be under 500 milliseconds. Furthermore, the function needs to securely access resources inside an Azure Virtual Network.
Which Azure Functions hosting plan should you recommend?
Answer options:
A.
Consumption plan
B.
Premium plan
C.
Dedicated (App Service) plan
D.
Azure Container Instances
How to approach this question
Identify the two constraints: 'No cold starts' and 'VNet integration'. Both point away from Consumption and toward Premium.
Full Answer
B.Premium plan✓ Correct
Premium plan
The Azure Functions Premium plan is designed for serverless workloads that require advanced features. It provides 'pre-warmed' instances to completely eliminate cold starts, ensuring the first request is processed instantly (<500ms). It also provides native VNet Integration to access private resources. The Consumption plan suffers from cold starts and lacks VNet integration. The Dedicated plan lacks the rapid, event-driven serverless scaling needed for sudden spikes.
Common mistakes
Choosing Consumption plan because it's the default 'serverless' option, ignoring the cold start and VNet constraints.
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