Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A SOC analyst wants to detect when a user signs in from a device that has never been used by that user before. The analyst plans to use Microsoft Sentinel with the SigninLogs table. Which KQL approach correctly identifies sign-ins from devices not previously associated with the user within the last 30 days?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Join the SigninLogs table with itself to find the earliest sign-in per user and device, then filter for those that match the earliest timestamp
Correct. By summarizing the earliest sign-in time for each user-device pair and joining back, you can identify sign-ins that are the first for that combination, effectively detecting new device usage.
B
Distractor review
Use the _GetWatchlist function with a custom watchlist of known user-device pairs
Incorrect. While a watchlist could store known devices, it would require manual or external updates and does not leverage historical data in the table.
C
Distractor review
Use the BehaviorAnalytics table which already identifies new devices
Incorrect. BehaviorAnalytics does provide anomalies, but the scenario asks for a custom query using SigninLogs, and the analyst needs to create the detection rule themselves.
D
Distractor review
Apply the 'where DeviceId != '' and DeviceId startswith "device-"' filter to ensure the device is new
Incorrect. This filter does not check historical association; it merely filters out empty device IDs or those with a specific prefix, not identifying first-time usage.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
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.
Technical deep dive
How to think about this question
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.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Related practice questions
Related SC-200 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A Microsoft Sentinel scheduled analytics rule detects impossible travel but creates too many duplicate incidents for the same user within a short period. Which two rule settings should you tune? (Choose 2.)
Question 2
A phishing email was delivered to several users. The analyst wants to find all messages in the campaign, see delivery actions, and perform remediation from the Microsoft 365 Defender portal. Which tool should they use?
Question 3
A security analyst in Microsoft Defender for Cloud receives an alert that an Azure VM has a vulnerability with a high severity. The analyst wants to see the detailed finding, including the steps to remediate. Which blade or page should the analyst open?
Question 4
A company uses Microsoft Defender for Cloud to protect an Azure Kubernetes Service (AKS) cluster. The security team wants to receive security alerts about suspicious activities within the cluster, such as a container running with root privileges or attempts to read sensitive host paths. Which Defender for Cloud plan must be enabled to generate these alerts?
Question 5
A security analyst is configuring Microsoft Sentinel scheduled analytics rules to detect brute-force attacks on Microsoft Entra ID. Arrange the steps in the correct order from first to last.
Question 6
An organization uses Microsoft 365 Defender. A security analyst is investigating a malware incident on a user's device. The automated investigation and response (AIR) has already isolated the device from the network. The analyst now needs to collect a copy of a specific suspicious file from the device for further analysis. Which action should the analyst initiate from the device's entity page?
FAQ
Questions learners often ask
What does this SC-200 question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Join the SigninLogs table with itself to find the earliest sign-in per user and device, then filter for those that match the earliest timestamp — To detect a 'new device' sign-in, the analyst needs to compare each sign-in event against the historical record of device-to-user associations. The most efficient KQL approach is to self-join the SigninLogs table: first, create a derived table of earliest sign-in per user and device (e.g., using summarize by DeviceId, UserPrincipalName). Then, join back to the original sign-in events. If the sign-in's timestamp equals the earliest timestamp (within a tolerance), it is the first time. Alternatively, the analyst can use the 'join' with a condition that no previous sign-in exists (using anti-join). The correct approach is to summarize to get the first sign-in date and then filter. Using the _GetWatchlist function is not relevant here, and the DeviceId must be checked for existence in prior events. The option using 'where DeviceId has not been seen before' is invalid KQL syntax.
What should I do if I get this SC-200 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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