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 Files

  Why this is correct

  Azure Files provides fully managed file shares that are accessible via the SMB protocol, which can be mounted by multiple Linux VMs concurrently. These shares reside in Azure storage accounts and can be accessed across availability zones, enabling shared read/write access for applications. This directly meets the requirement for a common file system accessible by several VMs simultaneously.

• ✗

  Azure Blob Storage

  Why it's wrong here

  Azure Blob Storage is an object-based storage service for large amounts of unstructured data, such as images or backups, accessed via REST APIs. It does not natively support the SMB protocol, nor does it present a file system interface that can be mounted by a Linux VM. Even though some tools can map Blob to a network drive, that is not a native SMB mount and lacks the consistency and semantics required for a shared file system.

  When this WOULD be correct

  A company needs to store and serve large amounts of unstructured data, such as images, videos, or backups, to applications via HTTP/HTTPS, and does not require SMB protocol or concurrent file-level access across VMs.

• ✗

  Azure Managed Disks

  Why it's wrong here

  Azure Managed Disks are persistent block-level storage volumes attached to a single virtual machine, typically mounted as a local disk like /dev/sda1. They cannot be attached to multiple VMs for concurrent read/write access because the file system is not cluster-aware, and simultaneous mounting would risk data corruption. This makes them unsuitable as a shared file system across several Linux VMs.

  When this WOULD be correct

  A company needs to attach high-performance, durable disk storage to a single Azure VM for database workloads, requiring low latency and support for premium SSD tiers. The question would specify a single VM and no multi-instance file sharing.

• ✗

  Azure Queue Storage

  Why it's wrong here

  Azure Queue Storage is a messaging service designed for asynchronous communication between application components, storing small messages that are processed by workers. It does not offer a file system interface, SMB port, or block storage, so it is impossible to mount it as a drive or access files directly. Its purpose is decoupling and scaling, not persistent shared storage.

  When this WOULD be correct

  A company needs to decouple components of a distributed application, allowing asynchronous message passing between them. For example, a web frontend sends order processing tasks to a backend worker via a queue, ensuring reliable delivery and load leveling.

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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