The answer is to deploy a single Sentinel workspace and configure data collection rules to collect logs from all subscriptions. This workspace-centric design is the most cost-effective Sentinel log ingestion from multiple subscriptions because it avoids the redundant storage and management overhead of multiple workspaces, each incurring separate ingestion and retention charges. On the Microsoft Cybersecurity Architect exam, this scenario tests your understanding of centralized log management versus distributed architectures; a common trap is assuming Azure Policy or hub-spoke networking handles ingestion, but neither centralizes the actual log data. Remember the memory tip: “One workspace to rule them all” — when the goal is cost-effective ingestion across subscriptions, a single workspace with data collection rules is always the correct path.
SC-100 Design security solutions for infrastructure Practice Question
This SC-100 practice question tests your understanding of design security solutions for infrastructure. 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 plans to use Microsoft Sentinel to detect threats across multiple Azure subscriptions. You need to design a cost-effective solution that ingests logs from all subscriptions. What should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy a single Sentinel workspace and configure data collection rules to collect logs from all subscriptions
Option C is correct because a workspace-centric design with data collection rules sends logs from multiple subscriptions to a single workspace, reducing costs. Option A is incorrect because multiple workspaces increase cost. Option B is incorrect because Azure Policy does not centralize ingestion. Option D is incorrect because a hub-spoke network does not solve log ingestion.
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.
✗
Use Azure Lighthouse to manage cross-subscription connectivity
Why it's wrong here
Lighthouse manages access, not log ingestion.
✓
Deploy a single Sentinel workspace and configure data collection rules to collect logs from all subscriptions
Why this is correct
Centralized workspace with DCRs is cost-effective.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a separate Sentinel workspace for each subscription
Why it's wrong here
Multiple workspaces increase cost and complexity.
✗
Use Azure Policy to assign a Log Analytics workspace to each subscription
Why it's wrong here
Policy can assign workspaces but doesn't centralize by default.
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 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.
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 infrastructure — This question tests Design security solutions for infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy a single Sentinel workspace and configure data collection rules to collect logs from all subscriptions — Option C is correct because a workspace-centric design with data collection rules sends logs from multiple subscriptions to a single workspace, reducing costs. Option A is incorrect because multiple workspaces increase cost. Option B is incorrect because Azure Policy does not centralize ingestion. Option D is incorrect because a hub-spoke network does not solve log ingestion.
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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