AZ-204 Practice Question: Azure Files SMB vs Blob Storage for standard file…
A Windows desktop application uses standard .NET file system calls such as File.ReadAllText and Directory.GetFiles. The team wants to move the file storage to Azure. The application code must not be rewritten. Which Azure storage service supports this requirement?
⚠ Common exam trap
Test-takers frequently assume Azure Blob Storage is the only file storage option and overlook Azure Files, which is specifically designed for lift-and-shift scenarios requiring SMB-based file sharing without code changes.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Files with an SMB share mounted as a drive letter on the Windows machine
Azure Files with an SMB share mounted as a drive letter on the Windows machine allows the existing .NET application to use standard file system calls like File.ReadAllText and Directory.GetFiles without any code changes. This is because the mounted SMB share presents itself as a local drive, and the .NET runtime interacts with it through the standard Windows file system API, which internally uses the SMB protocol (CIFS) to communicate with Azure Files. No SDK or API rewrite is required.
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 with an SMB share mounted as a drive letter on the Windows machine
Why this is correct
SMB shares exposed by Azure Files are indistinguishable from local or network drives at the OS level. The .NET file system APIs translate directly to SMB operations on the share, requiring zero code changes in the application.
- ✗
Azure Blob Storage with the Azure Storage SDK replacing all file system calls
Why it's wrong here
Azure Blob Storage is an object storage solution designed for massive scale and unstructured data, not a traditional file system. It fundamentally lacks support for drive-letter mounting or the Server Message Block (SMB) protocol required for direct operating system file I/O. Consequently, integrating an existing application would necessitate a complete rewrite of all file system calls to utilize the Azure Storage SDK (e.g., BlobClient or BlobContainerClient), directly violating the problem's constraint of requiring zero code changes.
- ✗
Azure Queue Storage for staging files between producer and consumer processes
Why it's wrong here
Azure Queue Storage is a messaging service primarily used for decoupling application components and handling asynchronous tasks, not for storing file contents. Its design limits individual message sizes to 64 KB, making it wholly unsuitable for transferring or storing typical files. Furthermore, Queue Storage provides no file system interface or semantics, meaning it cannot be mounted as a drive or accessed via standard file I/O operations, rendering it incompatible with the requirement.
- ✗
Azure Table Storage with the file content stored as base64-encoded entity properties
Why it's wrong here
Azure Table Storage is a NoSQL key-value store optimized for structured, non-relational data, not for general-purpose file storage. While it can store binary data as base64-encoded strings within entity properties, each property is strictly limited to 64 KB. This severe size constraint makes it impractical for storing even moderately sized files, and it offers no native file system interface or SMB support, thus requiring extensive application code modifications to interact with it via its SDK.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AZ-204 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-204 exam.