Microsoft Azure Architect Design (AZ-304) Practice Test

What is the most appropriate layer of storage for log files that must remain unchangeable but need to be retrievable over an extended period?

1. Azure Blob storage with Archive tier

2. A file share with access control

3. Ingesting files to Azure Log Analytics

4. Blob storage with a time-based policy

The correct answer is: Azure Blob storage with Archive tier

The most appropriate layer of storage for log files that must remain unchangeable and retrievable over an extended period is Azure Blob storage with Archive tier. This storage tier is specifically designed for data that is infrequently accessed and intended for long-term retention. The Archive tier allows you to store large volumes of data at a very low cost, making it ideal for logs that are not regularly accessed but must be retained for compliance or auditing purposes. In this context, the Archive tier provides immutability, meaning that once data is written, it cannot be modified or deleted, thereby meeting the requirement for unchangeable log files. This ensures that the logs are preserved safely over extended periods while still being retrievable when needed. Other storage options do not meet all these requirements effectively. For instance, a file share with access control allows for easy file access and management, but it does not guarantee immutability over long periods. Ingesting files to Azure Log Analytics may provide better querying and analysis capabilities, but it is not designed for long-term, unchangeable storage. Blob storage with a time-based policy, while useful for lifecycle management, does not ensure that the data will be kept in an unchangeable state indefinitely. Thus, choosing Azure Blob storage