Question 464 of 1,031

Describe Azure architecture and services →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is Azure File Sync, because it allows you to cache Azure Files locally on-premises by synchronizing the most frequently accessed files to a small Windows Server machine at each branch office, while maintaining a single unified namespace so users see the same UNC path whether the file is cached or stored in the cloud. This works through cloud tiering, which keeps only the hottest files locally to minimize latency and bandwidth usage, while all data remains in Azure Files as the primary storage. On the AZ-900 exam, this scenario tests your understanding of how Azure File Sync differs from simply mounting an Azure file share directly—a common trap is choosing Azure Files alone, which lacks local caching and a unified namespace. Remember the memory tip: “Sync for cache, share for storage”—Azure File Sync is the caching layer, while Azure Files is the cloud storage backend.

AZ-900 Describe Azure architecture and services Practice Question

This AZ-900 practice question tests your understanding of describe azure architecture and services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

A company has multiple on-premises file servers that store user home directories and department shares. The company wants to migrate these file shares to Azure Files to eliminate on-premises server maintenance. However, users frequently access large files, and the company wants to cache the most frequently accessed files locally on a small Windows Server machine at each branch office to minimize latency and bandwidth usage. The company also wants a single unified namespace so users can access files using the same path regardless of whether the files are cached locally or stored in Azure. Which Azure service should the company use?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

Question 1mediummultiple choice

Read the full NAT/PAT explanation →

A
Azure Blob Storage with Azure Content Delivery Network (CDN)
Why wrong: Azure Blob Storage is an object storage solution, not a file share. Azure CDN can cache content at edge locations but does not provide a unified namespace for SMB file shares or support on-premises caching of file shares.
B
Azure File Sync
Azure File Sync enables you to centralize file shares in Azure Files while maintaining the flexibility, performance, and compatibility of an on-premises file server. It provides cloud tiering to cache frequently accessed files locally and transparently recalls files from Azure on demand, offering a single namespace.
C
Azure Site Recovery
Why wrong: Azure Site Recovery is a disaster recovery service that orchestrates replication and failover of workloads, not a file synchronization or caching solution.
D
Azure Migrate
Why wrong: Azure Migrate is a service for discovering, assessing, and migrating on-premises servers, databases, and applications to Azure. It does not provide ongoing file caching or a unified namespace for file shares.

Full breakdown with real-world context →

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 caching of frequently accessed files on a local Windows Server at each branch office while maintaining a single unified namespace (the same UNC path). It synchronizes files between Azure Files and on-premises servers, allowing users to access files locally for low latency and bandwidth savings, while changes are synced to Azure. This directly addresses the requirement to eliminate on-premises server maintenance by using Azure Files as the primary storage, with local caching for performance.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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 with Azure Content Delivery Network (CDN)
Why it's wrong here
Azure Blob Storage is an object storage solution, not a file share. Azure CDN can cache content at edge locations but does not provide a unified namespace for SMB file shares or support on-premises caching of file shares.
✓
Azure File Sync
Why this is correct
Azure File Sync enables you to centralize file shares in Azure Files while maintaining the flexibility, performance, and compatibility of an on-premises file server. It provides cloud tiering to cache frequently accessed files locally and transparently recalls files from Azure on demand, offering a single namespace.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Site Recovery
Why it's wrong here
Azure Site Recovery is a disaster recovery service that orchestrates replication and failover of workloads, not a file synchronization or caching solution.
✗
Azure Migrate
Why it's wrong here
Azure Migrate is a service for discovering, assessing, and migrating on-premises servers, databases, and applications to Azure. It does not provide ongoing file caching or a unified namespace for file shares.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may confuse Azure File Sync with Azure Blob Storage or Azure Migrate, mistakenly thinking that blob storage with CDN can serve file shares or that a migration tool provides ongoing caching and synchronization, rather than recognizing that Azure File Sync is the only service that combines local caching, cloud tiering, and a unified SMB namespace.

Detailed technical explanation

How to think about this question

Azure File Sync uses the File Sync agent on a Windows Server to create a sync group with an Azure file share, enabling cloud tiering where only frequently accessed files are cached locally while less-used files are tiered to Azure. The unified namespace is achieved because the local server presents the same SMB share path (e.g., \\server\share) that transparently accesses cached files locally or retrieves tiered files from Azure on demand. In a real-world scenario, this allows branch offices with limited bandwidth to maintain fast access to large files while centralizing storage in Azure, with the File Sync agent handling conflict resolution and change detection via the Azure File Sync REST API.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this AZ-900 question test?

Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Azure File Sync — Azure File Sync is the correct choice because it enables caching of frequently accessed files on a local Windows Server at each branch office while maintaining a single unified namespace (the same UNC path). It synchronizes files between Azure Files and on-premises servers, allowing users to access files locally for low latency and bandwidth savings, while changes are synced to Azure. This directly addresses the requirement to eliminate on-premises server maintenance by using Azure Files as the primary storage, with local caching for performance.

What should I do if I get this AZ-900 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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