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

  Why it's wrong here

  Azure Blob Storage is an object storage service that stores data as blobs (binary large objects) in a flat hierarchical namespace based on containers. It is optimized for storing massive amounts of unstructured data, such as text or binary data, and accessed via REST APIs or SDKs, not through the SMB protocol. Because it does not present a file share that can be mounted as a network drive, it cannot satisfy the requirement for a shared file system that multiple Azure VMs can simultaneously access with Active Directory Domain Services authentication.

  When this WOULD be correct

  A company needs to store large amounts of unstructured data (e.g., images, videos, backups) accessible via HTTP/HTTPS from anywhere, with tiered storage options for cost optimization. The service must support REST APIs and SDKs for application development.

• ✓

  Azure Files

  Why this is correct

  Azure Files offers fully managed, cloud-based file shares that support the SMB 3.0 protocol. It integrates with Azure AD DS or on-premises AD DS for authentication and can be mounted simultaneously by multiple Azure VMs. This meets all requirements.

• ✗

  Azure NetApp Files

  Why it's wrong here

  While Azure NetApp Files provides high-performance NFS and SMB shares, it is designed for enterprise-grade workloads requiring sub-millisecond latency and massive throughput via dedicated hardware. This option fails because the requirement specifies a fully managed service that integrates with Active Directory Domain Services; however, standard NetApp deployments often require additional configuration compared to Azure Files. You would select this if your application required extreme IOPS or specific POSIX file permissions for high-performance computing.

• ✗

  Azure Disk Storage

  Why it's wrong here

  Azure Disk Storage provides block-level disks that can be attached to Azure VMs. While multiple VMs can use Azure Shared Disks in limited configurations, this is complex and not a true file share with SMB protocol. It is not the intended solution for shared file storage.

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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