AZ-305 Design data storage solutions Practice Question
A company has 10 branch offices, each with Windows file servers. They want to centralize file storage in Azure and allow each branch office to cache files locally for fast access. The solution must support cloud tiering so that only frequently accessed files are kept locally. Which Azure service should they implement?
⚠ Common exam trap
Test-takers frequently confuse Azure Files (a standalone cloud file share) with Azure File Sync (the hybrid caching and sync service), or incorrectly assume Azure Blob Storage can be used with File Sync, when in fact File Sync only integrates with Azure Files.
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 File Sync
Azure File Sync is the correct choice because it enables centralizing file shares in Azure Files while providing local caching on Windows file servers at each branch office. It supports cloud tiering, which automatically keeps only frequently accessed files locally and moves cold data to the cloud, meeting the requirement for fast local access and efficient storage.
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 File Sync
Why this is correct
Azure File Sync is the only solution that provides continuous, multi-site synchronization between on-premises Windows file servers and Azure Files. Its cloud tiering feature keeps only the most frequently accessed files on each branch server's local disk while transparently offloading the rest to Azure, allowing each office to retain a fast, cache-like working set without requiring a full copy. This gives you a single cloud namespace with local caching and hierarchical sync across all branch offices.
- ✗
Azure Files
Why it's wrong here
Azure Files is a managed cloud SMB share, but it lacks the synchronization engine that Azure File Sync provides. Without Azure File Sync, each branch office would either access the cloud share directly over the internet or VPN, which introduces latency and no automatic local cache, or you would have to manually replicate files to each server—there is no built-in multi-site sync or tiering. As a standalone service, Azure Files does not offer the local cache and distributed sync required for the branch office scenario described.
- ✗
Azure Blob Storage with Azure File Sync
Why it's wrong here
Azure Blob Storage with Azure File Sync is technically invalid because Azure File Sync is designed to work only with Azure Files, not with blob storage. Blob Storage is a REST-based object store and does not expose SMB file semantics, so on-premises Windows file servers cannot sync to it through Azure File Sync. Attempting to use Blob Storage would require a custom gateway or third-party tool, and you would be duplicating the native Azure Files integration rather than simplifying it; thus, this combination is redundant and non-functional as proposed.
- ✗
Azure NetApp Files
Why it's wrong here
Azure NetApp Files is a high-performance, enterprise-grade file service that supports SMB and NFS protocols, but it is not a sync and caching solution for branch offices. It has no built-in cloud tiering that can push data down to local branch server caches, nor does it provide replication between distributed on-premises Windows file servers. While suitable for HPC, databases, and other latency-sensitive workloads in Azure, it does not address the multi-site file server consolidation and local caching needs outlined in the scenario.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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