The correct answer is to use managed identity for Azure Functions to access Azure SQL Database, enforce TLS 1.2 for all Azure services, and enforce a minimum TLS version on Blob Storage. These three actions directly align with zero-trust data encryption in transit for Azure Functions, SQL, and Blob Storage because they ensure all data moving between services is encrypted via TLS and that authentication occurs without embedding secrets in code—managed identity handles this securely behind the scenes. On the Microsoft Cybersecurity Architect exam, this question tests your ability to distinguish between encryption in transit (TLS enforcement) and encryption at rest (CMK), a common trap where candidates confuse the two. Remember that firewall rules only control access, not encryption, and customer-managed keys protect data at rest, not in transit. A useful memory tip: “TLS for transit, managed identity for secrets, and never confuse a firewall with a cipher.”
SC-100 Practice Question: Design security solutions for applications and data
This SC-100 practice question tests your understanding of design security solutions for applications and data. 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.
Your company is designing a zero-trust security posture for a new application in Azure. The application uses Azure Functions, Azure SQL Database, and Azure Blob Storage. You need to ensure that data in transit is encrypted and that the application can authenticate without storing secrets in code. Which THREE actions should you take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable 'Enforce minimum TLS version' on the Blob Storage account
Options A, C, and E are correct. Enforcing TLS 1.2 encrypts data in transit, managed identity for Azure Functions provides secretless authentication to Azure SQL, and Enforce minimum TLS version on Blob Storage ensures encrypted connections. Option B is wrong because firewall rules don't encrypt data. Option D is wrong because CMK is for encryption at rest, not in transit.
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.
✓
Enable 'Enforce minimum TLS version' on the Blob Storage account
Why this is correct
Ensures clients use TLS 1.2+ for encrypted connections.
Related concept
Read the scenario before looking for a memorised answer.
✓
Configure the application to use TLS 1.2 or higher for all connections
Why this is correct
Enforces encryption in transit.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use managed identity for Azure Functions to access Azure SQL Database
Why this is correct
Provides secure, secretless authentication.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable customer-managed keys (CMK) for Azure SQL Database
Configure the Azure SQL firewall to allow only the Functions IP range
Why it's wrong here
Firewall controls access but doesn't encrypt data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
Identify which SC-100 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Design security solutions for applications and data — This question tests Design security solutions for applications and data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable 'Enforce minimum TLS version' on the Blob Storage account — Options A, C, and E are correct. Enforcing TLS 1.2 encrypts data in transit, managed identity for Azure Functions provides secretless authentication to Azure SQL, and Enforce minimum TLS version on Blob Storage ensures encrypted connections. Option B is wrong because firewall rules don't encrypt data. Option D is wrong because CMK is for encryption at rest, not in transit.
What should I do if I get this SC-100 question wrong?
Identify which SC-100 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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