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 (AKS)

  Why this is correct

  Azure Kubernetes Service (AKS) is Azure's managed Kubernetes offering, which abstracts the control plane and manages the worker node VMs as part of the cluster. It provides built-in capabilities such as horizontal pod autoscaling, cluster autoscaling, service discovery via DNS, and self-healing, so you don't directly provision or patch underlying VMs. By defining desired state in Kubernetes manifests, AKS continuously reconciles the cluster, making it the correct choice for running a containerized application without managing VMs.

• ✗

  Azure Container Instances

  Why it's wrong here

  Azure Container Instances (ACI) is a serverless service that runs individual containers or simple container groups without requiring you to manage VMs, but it does not provide full orchestration features. It lacks automatic multi-container scaling, rolling deployments, and built-in service discovery across a cluster, which are essential for a distributed containerized application. ACI is ideal for burst-like jobs or as a component in a custom orchestration solution, but on its own it cannot handle the lifecycle of a set of interdependent services, making it incorrect for this scenario.

  When this WOULD be correct

  A question that asks for the simplest way to run a single container or a small number of containers without orchestration, where the requirement is quick deployment and per-second billing, and no need for scaling, load balancing, or service discovery.

• ✗

  Azure App Service

  Why it's wrong here

  Azure App Service is a fully managed Platform-as-a-Service (PaaS) designed for hosting web apps, REST APIs, and mobile backends. While it can run containers through Web App for Containers, it is not a container orchestration platform and lacks the native multi-container scheduling, service discovery, and fine-grained scaling policies of Kubernetes. It is optimized for a single web application or API, not for orchestrating a cluster of containerized microservices, so it does not fulfill the requirement of managed container orchestration.

  When this WOULD be correct

  A company wants to deploy a web application using a pre-built container image (e.g., from Docker Hub) with automatic scaling and load balancing, but does not need full container orchestration or service discovery. Azure App Service for Containers would be the correct choice.

• ✗

  Azure Virtual Machines

  Why it's wrong here

  Azure Virtual Machines (VMs) are an Infrastructure-as-a-Service (IaaS) offering, meaning you are responsible for the entire stack above the hypervisor, including the operating system, container runtime (e.g., Docker or containerd), patching, and load balancing. To use VMs for containers, you would either manually install and configure Kubernetes or a similar orchestrator, which involves managing VM scale sets, networking, and storage—directly contradicting the 'without managing any VMs' requirement. Thus, VMs are the least suitable option, as they maximize rather than eliminate infrastructure management.

  When this WOULD be correct

  This option would be correct if the question specified a need for full control over the operating system, custom software installations, or legacy applications that cannot be containerized, and the candidate is willing to manage VMs.

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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