SC-100 Practice Question: Recommend security best practices and priorities
This SC-100 practice question tests your understanding of recommend security best practices and priorities. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
You are the lead security architect for a multinational corporation that recently completed a merger. The new entity, Contoso Ltd., has a complex Azure environment with over 200 subscriptions spread across multiple management groups. The company's security team has identified several critical issues: (1) many subscriptions have Azure Security Center's Secure Score below 30%, (2) there are numerous unmanaged VMs with public IP addresses, (3) there is no centralized logging for security events, and (4) identity management is fragmented with multiple Azure AD tenants. The CEO mandates a 'zero-trust' security posture within 12 months. You have a limited budget and must prioritize the most impactful actions. Which course of action should you take first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Consolidate all Azure AD tenants into a single tenant and establish a common identity baseline
Option C is correct because identity is the foundational control plane for zero-trust architecture. Without a unified identity baseline across a single Azure AD tenant, you cannot enforce consistent conditional access policies, least-privilege access, or authentication strength—making all other security controls ineffective. Consolidating tenants first directly addresses the fragmented identity management issue and enables centralized policy enforcement, which is the highest-impact, lowest-cost action to improve the security posture within 12 months.
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.
✗
Implement Azure Sentinel to centralize logs and create automated response playbooks
Why it's wrong here
Log centralization is important but should follow identity consolidation.
✗
Deploy Azure Firewall and enforce forced tunneling for all VNets
Why it's wrong here
Network controls are part of zero-trust but depend on identity.
✓
Consolidate all Azure AD tenants into a single tenant and establish a common identity baseline
Why this is correct
Zero-trust requires a unified identity to enforce consistent access policies.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Deploy Azure Policy to deny creation of VMs with public IPs and enforce NSGs
Why it's wrong here
This addresses a symptom but doesn't fix the identity fragmentation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often prioritize network controls (Azure Firewall, forced tunneling) or monitoring tools (Azure Sentinel) because they seem more directly related to 'security' or 'visibility,' but the SC-100 exam emphasizes that identity is the new perimeter in zero-trust, and without a unified identity plane, all other controls are undermined.
Detailed technical explanation
How to think about this question
Azure AD tenant consolidation involves migrating users, groups, and applications from multiple tenants into a single tenant using tools like Azure AD Connect or cross-tenant synchronization, which requires careful planning for UPN conflicts, application registration reassignment, and conditional access policy alignment. Under the hood, Azure AD uses a tenant-specific directory with a unique tenant ID (GUID) for all authentication tokens; fragmented tenants break the ability to use Azure RBAC, Azure Policy, and Azure AD Conditional Access uniformly across the entire organization. In a real-world merger scenario, failing to consolidate tenants first leads to duplicate identities, inconsistent MFA enforcement, and inability to use Azure AD Privileged Identity Management (PIM) across the combined environment, which directly contradicts zero-trust principles of explicit verification and least privilege.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-100 question in full detail.
Recommend security best practices and priorities — This question tests Recommend 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: Consolidate all Azure AD tenants into a single tenant and establish a common identity baseline — Option C is correct because identity is the foundational control plane for zero-trust architecture. Without a unified identity baseline across a single Azure AD tenant, you cannot enforce consistent conditional access policies, least-privilege access, or authentication strength—making all other security controls ineffective. Consolidating tenants first directly addresses the fragmented identity management issue and enables centralized policy enforcement, which is the highest-impact, lowest-cost action to improve the security posture within 12 months.
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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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