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.

• ✓

  A) Azure Blob Storage

  Why this is correct

  Azure Blob Storage is the correct choice because it is purpose-built for storing massive quantities of unstructured data, including images, videos, and documents, as binary large objects. It exposes data through HTTP/HTTPS endpoints, making it accessible directly from browsers and REST-based clients. Blob Storage offers tiered storage (hot, cool, archive) for cost optimization, and each blob is stored in a container within a storage account, enabling high scalability for petabyte-scale workloads.

• ✗

  B) Azure File Storage

  Why it's wrong here

  Azure File Storage is a managed file share service that provides Server Message Block (SMB) and Network File System (NFS) access, designed for lifting-and-shifting on-premises file servers or sharing files between multiple virtual machines. It does not provide a native HTTP/HTTPS object interface for storing unstructured binary files like images; instead, files are accessed via mounted network drives. While it can store image files, it is not optimized for massive volumes of random-access unstructured data and lacks the REST-based access patterns typical of object storage.

  When this WOULD be correct

  A company needs to migrate an on-premises file server to the cloud and requires shared file access for multiple virtual machines using standard SMB protocol.

• ✗

  C) Azure Queue Storage

  Why it's wrong here

  Azure Queue Storage is a messaging service used for reliable asynchronous communication between application components, where messages are sent to a queue and processed by consumers. Each message is limited to 64 KB in size, so it cannot hold large images or videos at all. Queue Storage is not a persistent data store for files; it is a transient buffer for passing messages, and its sole purpose is to decouple and scale application architecture, not to serve as a repository for unstructured data.

  When this WOULD be correct

  An exam question asks: 'A company needs to reliably store and deliver messages between application components for asynchronous processing. Which Azure service should they use?' In that scenario, Azure Queue Storage is the correct answer.

• ✗

  D) Azure Table Storage

  Why it's wrong here

  Azure Table Storage is a NoSQL key-value store tailored for structured, semi-structured, or schemaless data such as application metadata, user records, or device telemetry. It stores entities as rows with partition and row keys, and each entity can contain only up to 1 MB of data, making it entirely unsuitable for large binary files like images or videos. Table Storage does not support storing blob content directly; it is designed for fast read/write access to small structured data points, not for bulky unstructured assets.

  When this WOULD be correct

  A company needs to store structured, non-relational data (e.g., user profiles, device logs) with key-based access and high scalability, and does not require complex queries or joins.

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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