The correct answer is that this configuration disables anonymous public access to the container, which is the security best practice enforced by the ARM template snippet. By setting the `publicAccess` property to `None`, the template explicitly blocks any unauthenticated requests to the container, overriding the default Azure Storage account-level setting that might otherwise allow anonymous read access. On the Microsoft Cybersecurity Architect exam, this scenario tests your understanding of how to secure Azure Storage at the container level, often appearing in ARM template or policy questions where a candidate must identify misconfigurations that expose data. A common trap is assuming that disabling public access at the account level automatically secures all containers, but this snippet demonstrates the need for explicit container-level enforcement. Remember the mnemonic “None is the only safe zone” to recall that setting `publicAccess` to `None` is the definitive way to block anonymous access.
SC-100 Practice Question: Design solutions that align with security best practices and priorities
This SC-100 practice question tests your understanding of design solutions that align with security best practices and priorities. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Exhibit
Refer to the exhibit.
```json
{
"type": "Microsoft.Storage/storageAccounts/blobServices/containers",
"apiVersion": "2021-04-01",
"name": "[parameters('storageAccountName')]/default/[parameters('containerName')]",
"properties": {
"publicAccess": "None"
}
}
```
Refer to the exhibit. You are reviewing an ARM template snippet for an Azure Storage container. Which security best practice does this configuration enforce?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Disables anonymous public access to the container
The ARM template snippet sets the `publicAccess` property of the container to `None`. This explicitly disables anonymous public access to the container, enforcing the security best practice of preventing unauthenticated access to Azure Storage data. By default, Azure Storage containers allow anonymous read access if enabled at the account level, but this configuration overrides that to block any public requests.
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.
✓
Disables anonymous public access to the container
Why this is correct
Setting publicAccess to None disables anonymous access.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Allows public access from the internet
Why it's wrong here
publicAccess is 'None', so public access is blocked.
✗
Configures a firewall rule to restrict access to specific IPs
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse the container-level `publicAccess` property with storage account-level firewall rules or encryption settings, leading them to select options that describe unrelated security features.
Detailed technical explanation
How to think about this question
The `publicAccess` property in the ARM template for a blob container accepts values `Container`, `Blob`, or `None`. Setting it to `None` ensures that even if the storage account allows anonymous access, the container itself rejects anonymous requests. This is enforced at the Azure Storage REST API layer, where requests without a valid `Authorization` header are denied with a 404 (Not Found) or 403 (Forbidden) status. In a real-world scenario, this prevents data exposure when a storage account is accidentally configured to allow anonymous access, providing a defense-in-depth layer.
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 SC-100 question in full detail.
Design solutions that align with security best practices and priorities — This question tests Design solutions that align with security best practices and priorities — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Disables anonymous public access to the container — The ARM template snippet sets the `publicAccess` property of the container to `None`. This explicitly disables anonymous public access to the container, enforcing the security best practice of preventing unauthenticated access to Azure Storage data. By default, Azure Storage containers allow anonymous read access if enabled at the account level, but this configuration overrides that to block any public requests.
What should I do if I get this SC-100 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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