The answer is the `startofday(TimeGenerated)` function. This is correct because it allows you to group network connection timestamps by the start of each day, enabling a simple count of outbound connections per day; a consistent, low number of daily connections from a single workstation strongly suggests periodic beaconing behavior. On the SC-200 exam, this question tests your ability to distinguish between KQL functions for time-based aggregation versus list creation or anomaly decomposition—a common trap is choosing `bin` (which works but is less intuitive for daily patterns) or `series_decompose` (which is for detecting spikes, not regular intervals). Remember that beaconing is about rhythm, not volume: if you see the same count every day after using `startofday`, that’s your beacon. Memory tip: “Start the day to catch the beacon.”
SC-200 Perform threat hunting Practice Question
This SC-200 practice question tests your understanding of perform threat hunting. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 analyst is performing threat hunting in Microsoft Sentinel and wants to identify anomalous outbound network connections from a compromised workstation. The analyst suspects that a beaconing pattern is present. Which KQL function is most appropriate to detect periodic beaconing behavior over time?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
startofday(TimeGenerated)
Option C is correct because the `startofday` function can be used to aggregate events by day and then count occurrences to detect regular beaconing. Option A is wrong because `make_list` is for creating arrays, not for time-series detection. Option B is wrong because `bin` can help but `startofday` is more natural for daily beaconing. Option D is wrong because `series_decompose` is for anomaly detection but not specifically for periodic beaconing.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
series_decompose(TimeGenerated)
Why it's wrong here
series_decompose is for anomaly detection on a time series, not for detecting periodicity directly.
✗
make_list(TimeGenerated)
Why it's wrong here
make_list creates a list of values, not suitable for detecting periodic patterns.
✓
startofday(TimeGenerated)
Why this is correct
startofday groups by day, making it easy to count daily beacons and detect periodicity.
Related concept
Static NAT maps one inside address to one outside address.
✗
bin(TimeGenerated, 1h)
Why it's wrong here
bin groups by hour but may be too granular for typical beaconing; it's not the best answer.
Common exam traps
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.
Detailed technical explanation
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.
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
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-200 question in full detail.
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.
Perform threat hunting — This question tests Perform threat hunting — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: startofday(TimeGenerated) — Option C is correct because the `startofday` function can be used to aggregate events by day and then count occurrences to detect regular beaconing. Option A is wrong because `make_list` is for creating arrays, not for time-series detection. Option B is wrong because `bin` can help but `startofday` is more natural for daily beaconing. Option D is wrong because `series_decompose` is for anomaly detection but not specifically for periodic beaconing.
What should I do if I get this SC-200 question wrong?
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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