AZ-900 - Describe Azure Architecture and Services (36% of the exam) - Section 2.3

Describe Azure storage services including storage account types, redundancy options, access tiers, and migration tooling.

Describe Azure Blob Storage, the available storage account and storage types, redundancy options (LRS, ZRS, GRS), and access tiers (hot, cool, and archive), weighing each tier's trade-off between cost and retrieval latency. Use AzCopy, Azure Storage Explorer, and Azure File Sync to move files, and select the redundancy level that meets a given availability requirement.

Azure storage account typesredundancy LRS ZRS GRSaccess tiers hot cool archiveAzure Blob StorageAzCopy and Storage Migration

Practice question for this objective

Free sampleDescribe Azure Architecture and Servicesmedium

A branch office keeps a Windows file server that staff use locally, and the team wants it to stay bi-directionally synced with Azure Files while caching only frequently used files on the local disk. Which tool delivers this?

AAzure File Sync installed on the server Correct
BAzCopy copying the file share each night
CAzure Data Box shipped to the branch office
DAzure Storage Explorer managing the share

Azure File Sync keeps a Windows file server bi-directionally synced with Azure Files and supports cloud tiering of infrequently used files. Azure File Sync centralises file shares in Azure Files yet keeps a Windows file server, automatically staying bi-directionally synced with the cloud copy and supporting cloud tiering so frequently accessed files are cached locally while infrequent ones stay in Azure.

Why A is correct: Correct. Azure File Sync centralises file shares in Azure Files yet keeps a Windows file server, automatically staying bi-directionally synced with the cloud copy and supporting cloud tiering so frequently accessed files are cached locally while infrequent ones stay in Azure.

Why B is wrong: AzCopy is a command-line copier whose synchronize option is one-direction only, so it cannot keep the local server and Azure Files updated in both directions as required.

Why C is wrong: Azure Data Box ships a physical appliance for one-off offline bulk transfer, so it does not provide the ongoing bi-directional sync or cloud tiering the branch office needs.

Why D is wrong: Azure Storage Explorer is a graphical app for manually browsing files and blobs, so it supports ad-hoc management rather than continuous server-to-cloud synchronisation with tiering.

See more AZ-900 practice questions, answers explained.

Exam traps in Describe Azure Architecture and Services

Answers that look right on this material and are not. Each one is a distractor from a different question in the AZ-900 bank for this domain.

The cool tier, for data idle at least 30 days
Why it is wrong: The cool tier targets infrequently accessed data held for at least 30 days, trading lower storage cost for a higher access cost, so it is wrong for constantly read blobs.
AzCopy run directly from the command line
Why it is wrong: AzCopy is the command-line utility that the backend relies on, so it lacks the graphical desktop interface the administrator is specifically requesting.
The cold tier, online with a 90-day minimum
Why it is wrong: The cold tier suits infrequent access at a 90-day minimum but stays online with lower retrieval latency and a higher storage cost than archive, so it does not meet the offline, lowest-cost requirement.

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