The answer is to configure a Log Analytics workspace with 30-day interactive retention and set long-term retention for older data. This is correct because Microsoft Sentinel’s cost optimization hinges on separating hot and cold storage tiers within the same workspace: interactive retention keeps logs quickly searchable for the last 30 days, while long-term retention automatically moves older data to a lower-cost archival tier, reducing storage expenses without sacrificing query performance for recent events. On the Microsoft Cybersecurity Architect exam, this question tests your understanding of Sentinel’s pricing model and retention architecture—a common trap is choosing Azure Storage or Event Hubs, which lack native log analytics query capabilities and incur higher egress costs. Remember the memory tip: “30 days hot, then archive the lot”—interactive retention covers your immediate investigation window, and long-term retention handles compliance without breaking the budget.
SC-100 Design security solutions for infrastructure Practice Question
This SC-100 practice question tests your understanding of design security solutions for infrastructure. 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.
Your company is deploying Microsoft Sentinel to centralize security logs from Azure, on-premises, and other clouds. You need to ensure logs are ingested cost-effectively while maintaining search performance for the last 30 days. What should you configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Log Analytics workspace with 30-day interactive retention and set long-term retention for older data.
Option D is correct because Sentinel uses Log Analytics workspaces; you can set interactive retention to 30 days and long-term retention to lower-cost archival. Option A is wrong because Azure Storage is not optimized for log analytics queries. Option B is wrong because Sentinel cost is based on data ingestion, not separate tiers. Option C is wrong because Azure Event Hubs is for real-time streaming, not cost-effective storage.
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.
✗
Store logs in Azure Blob Storage and use Azure Data Explorer for queries.
Why it's wrong here
This adds complexity and cost; Sentinel is designed to work with Log Analytics.
✓
Use Log Analytics workspace with 30-day interactive retention and set long-term retention for older data.
Why this is correct
This provides fast query for recent data and cheaper storage for older data.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Sentinel's free tier for 30 days and then move to paid tier.
Why it's wrong here
Sentinel's free tier is limited; cost is based on data volume.
✗
Ingest logs into Azure Event Hubs and then into Sentinel.
Why it's wrong here
Event Hubs adds cost; direct ingestion is simpler.
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: Use Log Analytics workspace with 30-day interactive retention and set long-term retention for older data. — Option D is correct because Sentinel uses Log Analytics workspaces; you can set interactive retention to 30 days and long-term retention to lower-cost archival. Option A is wrong because Azure Storage is not optimized for log analytics queries. Option B is wrong because Sentinel cost is based on data ingestion, not separate tiers. Option C is wrong because Azure Event Hubs is for real-time streaming, not cost-effective storage.
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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