The answer is to use a managed identity assigned to the playbook to authenticate to Azure SQL Database. This is correct because a managed identity provides a secure, identity-based authentication method that allows the Sentinel playbook to access Azure SQL without ever storing or rotating credentials, eliminating the risk of credential leakage. On the Microsoft Cybersecurity Architect exam, this question tests your understanding of how to secure automated workflows in cloud-native environments, often appearing as a trap where candidates confuse network-level controls like firewall rules with identity-based access. A common mistake is choosing data masking or customer-managed keys, but those address query result obfuscation and encryption at rest, not authentication. Remember the memory tip: “Identity for access, not masks or keys” — if the goal is to control who or what can connect, always look for a managed identity or Azure AD authentication first.
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 organization uses Microsoft Sentinel to detect threats. You need to ensure that sensitive data stored in Azure SQL Database is protected from unauthorized access by Sentinel playbooks. What should you implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a managed identity assigned to the playbook to authenticate to Azure SQL
Option A is correct because managed identities provide a secure, identity-based authentication for playbooks to access Azure SQL without storing credentials. Option B is wrong because firewall rules are network-level, not identity-based. Option C is wrong because data masking is for query results, not access control. Option D is wrong because CMK is for encryption at rest, not access control.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 dynamic data masking on the SQL database
Why it's wrong here
Data masking hides sensitive data from query results but doesn't prevent unauthorized access.
✗
Use customer-managed keys (CMK) for SQL Transparent Data Encryption
Why it's wrong here
CMK encrypts data at rest but doesn't control access to the database.
✗
Configure Azure SQL firewall rules to allow only Sentinel IP addresses
Why it's wrong here
Firewall rules control network access but don't authenticate the playbook identity.
✓
Use a managed identity assigned to the playbook to authenticate to Azure SQL
Why this is correct
Managed identities provide secure, credential-free authentication for Azure resources.
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-100 question in full detail.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SC-100 subnetting questions on CIDR, address ranges, and subnet selection.
Design security solutions for applications and data — This question tests Design security solutions for applications and data — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Use a managed identity assigned to the playbook to authenticate to Azure SQL — Option A is correct because managed identities provide a secure, identity-based authentication for playbooks to access Azure SQL without storing credentials. Option B is wrong because firewall rules are network-level, not identity-based. Option C is wrong because data masking is for query results, not access control. Option D is wrong because CMK is for encryption at rest, not access control.
What should I do if I get this SC-100 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SC-100 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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