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 Blob Storage with static website hosting

  Why this is correct

  Azure Blob Storage static website hosting enables you to serve HTML, CSS, and JavaScript directly from a storage container named $web. When enabled, Blob Storage automatically serves content over a public URL with no compute resources, charging only for storage and transactions. It scales automatically to handle traffic spikes and can be combined with Azure CDN for low-latency global delivery. This makes it the most cost-effective and operationally simple option for hosting static assets.

• ✗

  Azure App Service

  Why it's wrong here

  Azure App Service is a fully managed Platform-as-a-Service designed for hosting web applications that require server-side processing, such as ASP.NET, Node.js, or Python apps. Even though it can serve static files, it requires an App Service Plan that allocates compute capacity, so you pay for a background VM even when there is no traffic. For a static website with no server-side code, this introduces unnecessary cost and management overhead compared to Blob Storage's serverless model.

  When this WOULD be correct

  Azure App Service would be correct if the question specified a web application requiring server-side processing (e.g., ASP.NET, Node.js, PHP) or needing features like authentication, custom domains with SSL, or auto-scaling beyond static content.

• ✗

  Azure Virtual Machines

  Why it's wrong here

  Azure Virtual Machines are an Infrastructure-as-a-Service offering that gives you full control over a virtualized server environment. To host a static website on a VM, you would have to install and configure a web server, patch the operating system, manage security, and pay for compute capacity continuously, even during periods of no traffic. This approach is overkill for static HTML/CSS/JS content, which does not require a dedicated OS or server runtime, and results in significantly higher costs and operational complexity than using Blob Storage's static website hosting.

  When this WOULD be correct

  A company needs to run a custom web application with server-side code (e.g., ASP.NET, Java, PHP) that requires full control over the operating system and software dependencies, and is willing to manage the VM to meet specific compliance or performance requirements.

• ✗

  Azure CDN

  Why it's wrong here

  Azure CDN is a global content delivery network that accelerates the delivery of content by caching it at edge servers located near users. However, a CDN is not a hosting platform; it must pull content from an origin, such as Blob Storage, App Service, or a VM. Without an origin, there is nothing to distribute. Using only Azure CDN would require you to still deploy the static files somewhere else, making it an additional delivery layer, not a replacement for static website hosting.

  When this WOULD be correct

  A company has an existing static website hosted on Azure Blob Storage or App Service and wants to improve global load times and reduce latency for users worldwide. Azure CDN would be the correct answer to cache content at edge locations for faster delivery.

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?”