AZ-900 Describe Azure architecture and services Practice Question

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 Kubernetes Service

  Why it's wrong here

  Azure Kubernetes Service (AKS) is a managed Kubernetes orchestration platform for deploying, scaling, and managing complex, multi-container microservices across a cluster of worker nodes. Although the control plane is managed, you must maintain and patch the worker node VMs, perform cluster upgrades, and configure networking, ingress controllers, and persistent storage. Running a full orchestrator for a single container that responds to HTTP adds significant operational complexity and resource overhead, making Azure Container Instances the more appropriate and lightweight choice.

  When this WOULD be correct

  A company needs to deploy a containerized application with complex orchestration requirements, such as auto-scaling, rolling updates, and service discovery, and is willing to manage the cluster or use a managed Kubernetes service.

• ✓

  Azure Container Instances

  Why this is correct

  Azure Container Instances (ACI) is a serverless compute service that runs a single container directly on Microsoft-managed infrastructure without requiring a virtual machine, orchestration cluster, or any persistent provisioning. It is ideal for an HTTP-responding containerized app because you just specify the image and ports, and ACI starts the container in seconds with a public IP address. There are no nodes to patch, no cluster to update, and billing is per-second, so for a simple container workload nothing else is simpler or more cost-effective.

• ✗

  Azure Virtual Machines

  Why it's wrong here

  Azure Virtual Machines give you raw IaaS compute, so running a container requires manually provisioning the VM, installing the guest OS, setting up a container runtime like Docker, patching the OS, and managing public IP addressing and load balancing. You are responsible for the VM's health, security, and availability, which means ongoing maintenance and operational overhead. For simply satisfying HTTP requests from a container, this is dramatically overprovisioned and requires far more management than purpose-built container services such as Azure Container Instances.

  When this WOULD be correct

  A question that requires full control over the operating system, custom software installations, or legacy applications that cannot be containerized. For example: 'A company needs to run a legacy .NET Framework app that requires Windows Server features and custom registry settings. Which service provides the most control?'

• ✗

  Azure App Service

  Why it's wrong here

  Azure App Service is a fully managed PaaS platform primarily for hosting long-running web applications and REST APIs. While it supports Linux containers via the Web App for Containers feature, it is not optimized for a standalone container workload; you must define an App Service plan with performance tiers, auto-scaling rules, and other app-hosting features such as deployment slots and built-in authentication. For a simple container that just responds to HTTP requests, this adds unneeded platform overhead and complexity compared to starting a one-off container instance in a serverless fashion.

  When this WOULD be correct

  This option would be correct if the question asked for the simplest service to host a web application (not containerized) with built-in scaling and CI/CD support, without requiring container management. For example: 'A company wants to deploy a web app with automatic scaling and deployment slots, without managing infrastructure.'

Option-by-option analysis

Why each answer is right or wrong

Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-900 exam frequently reuses these exact scenarios with slightly different constraints.

Analysis generated from the official AZ-900blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”

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