Quick Answer
The answer is the `summarize` function with `count()`. This is correct because `summarize` aggregates rows into groups based on specified columns like `SourceIp` and `DestinationIp`, and `count()` returns the number of rows in each group, allowing you to detect when more than 10 outbound connections to a known bad IP occur within a 5-minute window. On the Microsoft Security Operations Analyst SC-200 exam, this tests your ability to write KQL for scheduled alert rules in Microsoft Sentinel, a common scenario where you must aggregate connection counts from syslog data. A frequent trap is confusing `summarize` with `project` or `extend`, which only reshape or add columns without grouping. Remember: if you need to count events per group, you must `summarize`—think of it as “summarize to summarize counts.”
This SC-200 practice question tests your understanding of perform threat hunting. 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.
You are a threat hunter using Microsoft Sentinel. You have ingested syslog data from a Palo Alto firewall. You want to create a scheduled query rule that alerts when more than 10 outbound connections to a known bad IP address occur within 5 minutes. Which KQL function should you use to summarize the count?
project SourceIp, DestinationIp
Why wrong: project only selects columns, does not count.
extend Count = 1
Why wrong: extend adds a calculated column but does not aggregate.
summarize count() by SourceIp, DestinationIp
summarize with count() provides the aggregation needed for threshold detection.
join kind=inner (Syslog)
Why wrong: join is for combining tables, not counting.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
summarize count() by SourceIp, DestinationIp
Option A is correct because `summarize` aggregates data by specified columns, and `count()` counts rows. Option B is wrong because `project` selects columns, does not aggregate. Option C is wrong because `extend` adds new columns. Option D is wrong because `join` merges tables.
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.
project SourceIp, DestinationIp
Why it's wrong here
project only selects columns, does not count.
extend Count = 1
Why it's wrong here
extend adds a calculated column but does not aggregate.
summarize count() by SourceIp, DestinationIp
Why this is correct
summarize with count() provides the aggregation needed for threshold detection.
Related concept
Static NAT maps one inside address to one outside address.
join kind=inner (Syslog)
Why it's wrong here
join is for combining tables, not counting.
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 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.
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
Perform threat hunting — This question tests Perform threat hunting — Static NAT maps one inside address to one outside address..
The correct answer is: summarize count() by SourceIp, DestinationIp — Option A is correct because `summarize` aggregates data by specified columns, and `count()` counts rows. Option B is wrong because `project` selects columns, does not aggregate. Option C is wrong because `extend` adds new columns. Option D is wrong because `join` merges tables.
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.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 2026
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