The answer is to isolate the device from the network as the first containment action during live response in Microsoft Defender for Endpoint. This step is critical because it immediately cuts off all network communication, preventing the suspicious process from spreading laterally to other systems or exfiltrating data, while still allowing you to continue your investigation through the live response session. On the Microsoft Security Operations Analyst SC-200 exam, this scenario tests your understanding of the containment priority in incident response—many candidates mistakenly choose to terminate the process first, but that fails to stop re-execution or network-based propagation. A common trap is thinking a firewall rule or memory dump suffices, but isolation is the fastest, most definitive block. Remember the mnemonic: “Isolate before you eradicate”—contain the blast radius before you clean the host.
SC-200 Respond to security incidents Practice Question
This SC-200 practice question tests your understanding of respond to security incidents. 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.
Your organization uses Microsoft Defender for Endpoint. A user reports that their device is running slowly and exhibiting unusual network activity. You run a live response session and find a suspicious process running. Which action should you take first to contain the threat?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Isolate the device from the network.
Option A is correct because isolating the device immediately prevents the threat from spreading to other devices while you investigate further. Option B is wrong because terminating the process alone does not prevent re-execution. Option C is wrong because collecting a memory dump does not contain the threat. Option D is wrong because adding a firewall rule is too slow and may not block all lateral movement.
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.
✗
Collect a full memory dump for analysis.
Why it's wrong here
Collecting a memory dump is investigative but does not contain the threat.
✗
Terminate the suspicious process.
Why it's wrong here
Terminating the process may stop the current activity but the threat could persist or restart.
✓
Isolate the device from the network.
Why this is correct
Isolating the device prevents lateral movement and further damage.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Add a firewall rule to block outbound traffic from the device.
Why it's wrong here
A firewall rule can help but is not immediate and may be bypassed by some threats.
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.
Respond to security incidents — This question tests Respond to security incidents — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Isolate the device from the network. — Option A is correct because isolating the device immediately prevents the threat from spreading to other devices while you investigate further. Option B is wrong because terminating the process alone does not prevent re-execution. Option C is wrong because collecting a memory dump does not contain the threat. Option D is wrong because adding a firewall rule is too slow and may not block all lateral movement.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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