The correct answer is that the script lists blobs modified in the last 7 days. This is achieved by using `Get-AzStorageBlob` with the `-Prefix` parameter to narrow the blob names, then piping the results into `Where-Object` to filter based on the `LastModified` property being greater than or equal to the current date minus seven days. On the DP-900 exam, this tests your ability to read Azure PowerShell scripts that combine storage blob retrieval with date-based filtering, a common scenario for monitoring recent data changes. A frequent trap is confusing this with copying or deleting blobs, but the script performs no such actions—it only filters and outputs. To remember this, think of the `Where-Object` block as a “date gate” that only lets blobs through if they were touched within the last week, making it a straightforward time-based filter rather than a data mover.
DP-900 Describe an analytics workload on Azure Practice Question
This DP-900 practice question tests your understanding of describe an analytics workload on azure. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
List blobs modified in the last 7 days
The script uses `Get-AzStorageBlob` with the `-Prefix` parameter to filter blobs by name, then applies a `Where-Object` filter to select only blobs whose `LastModified` property is greater than or equal to 7 days ago. This effectively lists blobs modified in the last 7 days. The script does not perform any copy or delete operations, and it does not list all blobs without filtering.
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.
✗
List all blobs in the container
Why it's wrong here
Filters by prefix and date, not all.
✗
Copy blobs to another container
Why it's wrong here
No copy operation.
✓
List blobs modified in the last 7 days
Why this is correct
Filters blobs by LastModified within 7 days.
Related concept
Read the scenario before looking for a memorised answer.
✗
Delete old blobs from the container
Why it's wrong here
No deletion is performed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates see `Get-AzStorageBlob` and assume it lists all blobs (option A), overlooking the `Where-Object` filter that restricts results to only recently modified blobs.
Detailed technical explanation
How to think about this question
The `Get-AzStorageBlob` cmdlet returns blob objects with metadata including `LastModified` (a UTC DateTime). The `-Prefix` parameter filters blobs by name prefix, which is useful for directory-like structures in flat blob storage. The `Where-Object` filter uses `.TotalDays` on a `TimeSpan` object to compare against 7 days; note that `(Get-Date).AddDays(-7)` creates a threshold in local time, which may cause off-by-one issues if the blob's `LastModified` is in UTC and the system timezone differs.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-900 question in full detail.
Describe an analytics workload on Azure — This question tests Describe an analytics workload on Azure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: List blobs modified in the last 7 days — The script uses `Get-AzStorageBlob` with the `-Prefix` parameter to filter blobs by name, then applies a `Where-Object` filter to select only blobs whose `LastModified` property is greater than or equal to 7 days ago. This effectively lists blobs modified in the last 7 days. The script does not perform any copy or delete operations, and it does not list all blobs without filtering.
What should I do if I get this DP-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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