AI-200 Event Driven Integration Practice Question
You are building an event-driven architecture where an Azure Function needs to process messages from an Azure Service Bus queue. To optimize cost and resource utilization during quiet periods, you want the Azure Function host to scale down to zero instances when the queue is empty, and scale out rapidly when messages arrive. Which hosting plan should you choose?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Functions Premium Plan or Consumption Plan
Azure Functions Premium Plan or Consumption Plan supports scale-to-zero and scaling based on Azure Service Bus queue length metrics via the Azure Functions Service Bus trigger scaler.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Azure Functions Premium Plan or Consumption Plan
Why this is correct
Both Consumption and Premium plans support scale-to-zero and event-driven scaling based on queue depth.
- ✗
Azure Virtual Machines with autoscale rules
Why it's wrong here
VMs do not scale to zero or provide serverless queue trigger bindings natively.
- ✗
Azure App Service Dedicated (App Service Plan - S1 tier)
Why it's wrong here
Dedicated App Service plans do not scale to zero; they run continuously, incurring costs even when idle.
- ✗
Azure Kubernetes Service with manual pod scaling
Why it's wrong here
AKS requires manual or KEDA configuration to scale to zero, whereas Functions provides native serverless scaling.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
About these practice questions
One of 503 original AI-200 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Microsoft exam blueprint
This AI-200 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AI-200 exam.