The answer is to use Basic Logs for high-volume low-value data and Analytics Logs for critical alerts. This tiered retention strategy directly addresses sentinel cost optimization data retention by routing less critical data, such as verbose firewall or infrastructure logs, to Basic Logs at a lower ingestion and storage rate, while ensuring that security alerts requiring full query capabilities and long-term interactive retention remain in Analytics Logs. On the Microsoft Cybersecurity Architect exam, this scenario tests your understanding of the Log Analytics table plans and how to balance cost against operational reliability—a common trap is assuming all data must be in Analytics Logs for security, which inflates costs unnecessarily. Remember the memory tip: “Basic for bulk, Analytics for action,” which reinforces that high-volume, low-value data belongs in Basic Logs to minimize costs without compromising critical alert processing.
SC-100 Practice Question: Design solutions that align with security best practices and priorities
This SC-100 practice question tests your understanding of design solutions that align with security best practices and priorities. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
A security team is designing a Microsoft Sentinel deployment. They need to minimize costs while ensuring critical alerts are always processed. Which data retention and ingestion strategy should they use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "always"
Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Basic Logs for high-volume low-value data and Analytics Logs for critical alerts
Option D is correct because it aligns with cost optimization and reliability requirements by using Basic Logs for high-volume, low-value data (e.g., firewall logs) and reserving Analytics Logs for critical alerts that require full query capabilities and interactive retention. This tiered approach ensures critical alerts are always processed with full fidelity while reducing storage costs for less important data.
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 Basic Logs for all data and retain for 90 days
Why it's wrong here
Basic Logs maximum retention is 30 days, cannot retain 90 days.
✗
Use Analytics Logs for all data and retain for 30 days
Why it's wrong here
Analytics Logs are more expensive; not cost-minimizing.
✗
Use Basic Logs for critical alerts and retain for 30 days
Why it's wrong here
Critical alerts need faster query performance and longer retention; Basic Logs are not designed for frequent querying.
✓
Use Basic Logs for high-volume low-value data and Analytics Logs for critical alerts
Why this is correct
This balances cost and performance: cheap storage for bulk data, fast access for critical alerts.
Clue confirmation
The clue words "always", "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume all data must be in Analytics Logs for security monitoring, overlooking the cost-saving strategy of tiered ingestion where Basic Logs handle high-volume, low-value data without sacrificing critical alert processing.
Detailed technical explanation
How to think about this question
In Microsoft Sentinel, Basic Logs are stored in a separate table with lower ingestion cost (approx. $0.50/GB vs. $2.76/GB for Analytics Logs) but limited to 30-day retention and no support for scheduled analytics rules or interactive queries beyond simple searches. Analytics Logs support full KQL, up to 2-year retention, and are required for all detection rules; a common real-world scenario is ingesting verbose DNS logs as Basic Logs while keeping security event logs (e.g., Windows Event ID 4625) as Analytics Logs to balance cost and detection capability.
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.
Design solutions that align with security best practices and priorities — This question tests Design solutions that align with 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: Use Basic Logs for high-volume low-value data and Analytics Logs for critical alerts — Option D is correct because it aligns with cost optimization and reliability requirements by using Basic Logs for high-volume, low-value data (e.g., firewall logs) and reserving Analytics Logs for critical alerts that require full query capabilities and interactive retention. This tiered approach ensures critical alerts are always processed with full fidelity while reducing storage costs for less important data.
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: "always", "minimum / minimize". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
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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