ExpertHard1 markMultiple Choice
AZ-305 · Question 41 · Domain 4.1: Compute Solutions
You are designing a serverless architecture using Azure Functions.
The function will process messages from an Azure Service Bus queue. The function must be able to securely access an on-premises database via an existing Azure ExpressRoute connection. The workload is highly variable, experiencing sudden spikes in traffic, and requires avoiding 'cold starts' to maintain performance.
Which Azure Functions hosting plan should you recommend?
You are designing a serverless architecture using Azure Functions.
The function will process messages from an Azure Service Bus queue. The function must be able to securely access an on-premises database via an existing Azure ExpressRoute connection. The workload is highly variable, experiencing sudden spikes in traffic, and requires avoiding 'cold starts' to maintain performance.
Which Azure Functions hosting plan should you recommend?
Answer options:
A.
Consumption Plan
B.
Premium Plan
C.
Dedicated (App Service) Plan
D.
Azure Container Apps
How to approach this question
Match the requirements: VNet integration (rules out Consumption), no cold starts (rules out Consumption), dynamic scaling for spikes (favors Premium over Dedicated).
Full Answer
B.Premium Plan✓ Correct
Premium Plan
The Azure Functions Premium plan is the correct choice. It provides VNet integration, which is required to route traffic over the ExpressRoute connection to the on-premises database. It also provides pre-warmed instances, which eliminates cold starts. Finally, unlike the Dedicated plan, the Premium plan scales dynamically and rapidly to handle sudden spikes in workload, making it ideal for variable serverless processing.
Common mistakes
Choosing Consumption plan because it's 'serverless'. Consumption cannot connect to a VNet.
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