The correct answer is to enable just-in-time (JIT) VM access in Microsoft Defender for Cloud to lock down inbound traffic. This is the most effective immediate action because JIT access dynamically reduces the attack surface by creating temporary, time-bound network security group (NSG) rules that allow only authorized traffic to the Azure VM, effectively isolating it from ongoing exploitation while you plan a permanent fix. On the Microsoft Security Operations Analyst SC-200 exam, this scenario tests your understanding of incident response prioritization—specifically, that containment (via JIT) must come before remediation (like patching), which can be slow or disruptive. A common trap is choosing to patch immediately, but the exam emphasizes that JIT provides instant protection without changing the VM’s configuration. Memory tip: think “JIT first, patch later”—just-in-time access buys you time to patch safely.
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.
Your organization is using Microsoft Defender for Cloud to protect Azure workloads. A critical vulnerability was discovered in a virtual machine that is part of a production application. The vulnerability has a high severity score and is actively being exploited in the wild. You need to respond quickly to mitigate the risk. What is the most effective immediate action?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable just-in-time (JIT) VM access in Microsoft Defender for Cloud to lock down inbound traffic.
Enabling just-in-time (JIT) VM access reduces the attack surface by restricting inbound traffic to the VM, providing immediate protection. Option A is incorrect because patching may take time and could disrupt operations. Option B is incorrect because network security groups (NSGs) are already in place and changing rules may not address the vulnerability directly. Option D is incorrect because Defender for Cloud does not have automatic patching; it only recommends.
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.
✗
Apply the vendor patch immediately during business hours.
Why it's wrong here
Patching may cause downtime and is not immediate enough for active exploitation.
✓
Enable just-in-time (JIT) VM access in Microsoft Defender for Cloud to lock down inbound traffic.
Why this is correct
JIT reduces exposure by only allowing necessary traffic at scheduled times.
Related concept
Static NAT maps one inside address to one outside address.
✗
Modify the network security group (NSG) to block all inbound traffic to the VM.
Why it's wrong here
Blocking all inbound traffic may disrupt legitimate access to the application.
✗
Use the 'Remediate' option in Defender for Cloud to automatically apply the patch.
Why it's wrong here
Defender for Cloud does not have automatic patching capability; it only recommends.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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: Enable just-in-time (JIT) VM access in Microsoft Defender for Cloud to lock down inbound traffic. — Enabling just-in-time (JIT) VM access reduces the attack surface by restricting inbound traffic to the VM, providing immediate protection. Option A is incorrect because patching may take time and could disrupt operations. Option B is incorrect because network security groups (NSGs) are already in place and changing rules may not address the vulnerability directly. Option D is incorrect because Defender for Cloud does not have automatic patching; it only recommends.
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.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Your organization uses Microsoft Defender for Cloud to protect Azure resources. A security alert indicates that a virtual machine (VM) is communicating with a known malicious IP. The analyst needs to isolate the VM from the network to prevent further data exfiltration. What should the analyst do?
medium
A.Use Azure Bastion to connect to the VM and shut it down.
B.Use Azure Monitor to create an alert and then manually stop the VM.
C.Create an Azure Firewall rule to block traffic to the malicious IP.
✓ D.Apply a Just-in-time VM access policy in Microsoft Defender for Cloud to deny all inbound and outbound traffic.
Why D: Option B is correct because Defender for Cloud's Just-in-time VM access can create a network security group (NSG) rule to deny all traffic, effectively isolating the VM. Option A is wrong because Azure Bastion provides RDP/SSH access, not isolation. Option C is wrong because Azure Firewall rules apply to the entire network, not a single VM. Option D is wrong because Azure Monitor does not isolate VMs.
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Question Discussion
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