AZ-305 Design data storage solutions Practice Question
You are designing a hybrid storage solution where on-premises applications need low-latency access to file shares hosted in Azure. The solution must cache frequently accessed files locally and sync changes bidirectionally. Which Azure feature should you use?
⚠ Common exam trap
A common mix-up: candidates confuse Azure NetApp Files with ExpressRoute as a caching solution, but ExpressRoute only improves network latency and reliability—it does not provide local caching or bidirectional sync, which are core requirements of the scenario.
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 bidirectional syncing of Azure file shares with on-premises Windows Servers, caching frequently accessed files locally for low-latency access while automatically syncing changes back to Azure. This meets the hybrid requirement of local caching and bidirectional sync without requiring full migration or dedicated network circuits.
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 correct choice for a hybrid storage solution that requires ongoing, bidirectional synchronization. It installs an agent on your on-premises Windows Server, creates a local cache, and continuously syncs changes both to and from an Azure file share. This gives you local performance for active files while maintaining a cloud copy for disaster recovery, multi-site replication, and backup. Its cloud tiering policy also optimizes local storage capacity by automatically moving cold files to Azure and leaving placeholders.
- ✗
Azure Data Box
Why it's wrong here
Azure Data Box is an offline data transfer appliance designed to move large volumes of data into Azure as a one-time bulk upload. It does not provide ongoing bidirectional synchronization or local caching, because the physical device is shipped back to Azure after the initial transfer. Once the data is in Azure, any subsequent changes on-premises would not automatically propagate, making it unsuitable as a persistent hybrid storage sync solution. It could only be a seeding step before deploying Azure File Sync, not a substitute for it.
- ✗
Azure NetApp Files with ExpressRoute
Why it's wrong here
Azure NetApp Files with ExpressRoute delivers low-latency access to fully managed cloud file shares, but it does not provide local caching on on-premises servers. With this option, on-premises clients must retrieve every file over the express route connection each time they access it, which reintroduces network dependency and can be slower than local storage for large working sets. ExpressRoute only improves network latency and reliability; it does not create a local replica or perform bidirectional sync with on-prem data. Thus, it lacks the core hybrid capability of caching a copy locally while keeping changes synchronized.
- ✗
Azure Blob Storage with Azure Files migration
Why it's wrong here
Azure Blob Storage with Azure Files migration refers to moving your existing on-premises files into Azure Blob storage or an Azure file share, but that is a one-time migration action, not an ongoing sync mechanism. After the migration, the on-premises server no longer has a synchronized local cache, so any new changes on-premises would not be automatically reflected in Azure. To get local caching plus continuous sync, you need Azure File Sync, which is the service specifically built for hybrid file storage. Merely migrating without a sync agent leaves two disconnected copies that will quickly diverge.
Visual reference
Go deeper
Related to this question
About these practice questions
One of 795 original AZ-305 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AZ-305 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-305 exam.