Quick Answer
The correct configuration is to run the rule every 5 minutes with a 5-minute lookback period. This setting directly aligns with the detection requirement of more than 10 failed logons within 5 minutes from different IP addresses, ensuring the rule evaluates events strictly within that same time window. By matching the frequency and lookback to the detection window, you minimize false positives because the rule does not aggregate stale data from prior periods, while still catching the pattern promptly. On the SC-200 exam, this scenario tests your understanding of how custom detection rule settings in Microsoft Defender XDR control aggregation boundaries; a common trap is selecting a longer lookback like 1 hour, which could incorrectly combine separate user sessions into a single alert. Remember the memory tip: “Match the window to the window”—the lookback and frequency should mirror the time span defined in your KQL query to avoid over-alerting.
This SC-200 practice question tests your understanding of manage a security operations environment. 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.
You are a security operations engineer for a company that uses Microsoft Defender XDR. You need to create a custom detection rule that alerts when a user performs more than 10 failed logon attempts within 5 minutes from different IP addresses. The rule should use the IdentityLogonEvents table. You have written the KQL query and now need to configure the rule settings in Microsoft 365 Defender. Which configuration should you use for the rule frequency and lookback period to minimize false positives while ensuring timely detection?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
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.
Run every 5 minutes with a 5-minute lookback.
Matches the detection window exactly.
Run every 5 minutes with a 1-hour lookback.
Why wrong: May aggregate over multiple sessions, increasing false positives.
Run every 1 hour with no lookback.
Why wrong: No lookback misses past events.
Run every 24 hours with a 24-hour lookback.
Why wrong: Too coarse; would miss timely detection.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Run every 5 minutes with a 5-minute lookback.
Option A is correct because running every 5 minutes with a 5-minute lookback ensures the rule catches the pattern within the same window and minimizes false positives by not aggregating over longer periods. Option B is incorrect because a 1-hour lookback may capture multiple sessions. Option C is incorrect because a 24-hour run period is too coarse. Option D is incorrect because no lookback misses past events.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Run every 5 minutes with a 5-minute lookback.
Why this is correct
Matches the detection window exactly.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Run every 5 minutes with a 1-hour lookback.
Why it's wrong here
May aggregate over multiple sessions, increasing false positives.
Run every 1 hour with no lookback.
Why it's wrong here
No lookback misses past events.
Run every 24 hours with a 24-hour lookback.
Why it's wrong here
Too coarse; would miss timely detection.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
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.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SC-200 NAT questions on configuration and troubleshooting.
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FAQ
Manage a security operations environment — This question tests Manage a security operations environment — Static NAT maps one inside address to one outside address..
The correct answer is: Run every 5 minutes with a 5-minute lookback. — Option A is correct because running every 5 minutes with a 5-minute lookback ensures the rule catches the pattern within the same window and minimizes false positives by not aggregating over longer periods. Option B is incorrect because a 1-hour lookback may capture multiple sessions. Option C is incorrect because a 24-hour run period is too coarse. Option D is incorrect because no lookback misses past events.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SC-200 NAT questions on configuration and troubleshooting.
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 2026
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