The correct answer is a device with multiple connected networks, including an external IP. This pattern is suspicious because a finance subnet device should typically only communicate within its own internal network; connecting to multiple networks, especially an external IP, strongly suggests lateral movement or command-and-control (C2) activity, where an attacker pivots through the environment or phones home. On the Microsoft Security Operations Analyst SC-200 exam, this KQL query tests your ability to spot anomalous network behaviors in Microsoft Sentinel, a core skill for identifying compromised devices from network connections. A common trap is assuming any external connection is malicious—context matters, as a finance device rarely needs external access. Memory tip: think “one subnet, one purpose; multiple nets, multiple threats.”
SC-200 Respond to security incidents Practice Question
This SC-200 practice question tests your understanding of respond to security incidents. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Exhibit
Refer to the exhibit.
```kusto
DeviceInfo
| where Timestamp > ago(7d)
| where DeviceName has "finance"
| join kind=inner (
DeviceNetworkInfo
| where Timestamp > ago(7d)
| where LocalIPAddress startswith "10."
) on DeviceId
| project Timestamp, DeviceName, LocalIPAddress, ConnectedNetworks
```
Refer to the exhibit. A SOC analyst runs this KQL query in Microsoft Sentinel to investigate devices in the finance subnet. Which result would indicate that a device might be compromised?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A device with multiple connected networks, including an external IP.
The correct answer is D. A device with multiple connected networks, especially if those networks are unusual (e.g., a finance device connecting to external networks), could indicate lateral movement or command and control. The other options are not inherently suspicious.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
A device with multiple connected networks, including an external IP.
Why this is correct
Multiple networks, especially including external, could indicate compromise.
A device named 'finance-server-01' with a single network connection.
Why it's wrong here
A single connection is normal for a server.
✗
A device with no network connections in the last 7 days.
Why it's wrong here
No connections could mean the device is offline, not necessarily compromised.
✗
A device with a LocalIPAddress starting with 10.0.0.
Why it's wrong here
This is a common private IP range and not suspicious.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SC-200 subnetting questions on CIDR, address ranges, and subnet selection.
Respond to security incidents — This question tests Respond to security incidents — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: A device with multiple connected networks, including an external IP. — The correct answer is D. A device with multiple connected networks, especially if those networks are unusual (e.g., a finance device connecting to external networks), could indicate lateral movement or command and control. The other options are not inherently suspicious.
What should I do if I get this SC-200 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SC-200 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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