SC-900 Practice Question: Describe the capabilities of Microsoft security solutions
This SC-900 practice question tests your understanding of describe the capabilities of microsoft security solutions. 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.
A company uses Azure virtual machines for a production database. The security team wants to minimize the attack surface by blocking all inbound RDP (port 3389) traffic. However, administrators occasionally need to connect for maintenance. The team needs a solution that allows administrators to request temporary access to the RDP port, which is automatically revoked after a specified time. Which Microsoft Defender for Cloud feature should they use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Why wrong: This feature controls which applications can run on your VMs, not inbound port access.
B
Just-in-time (JIT) VM access
JIT locks down inbound traffic to VMs and allows authorized users to request temporary access to specific ports, which is automatically revoked after a set time.
C
File Integrity Monitoring (FIM)
Why wrong: FIM monitors changes to files and registries on VMs, not inbound access.
D
Security alerts
Why wrong: Security alerts notify about threats but do not control inbound access.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Just-in-time (JIT) VM access
Just-in-time (JIT) VM access is the correct feature because it specifically addresses the need to block inbound RDP (port 3389) traffic by default while allowing administrators to request temporary, time-bound access. When a request is approved, JIT dynamically modifies the network security group (NSG) to open the port for a specified duration, then automatically reverts the rule to deny all inbound traffic after the time expires. This directly minimizes the attack surface by eliminating persistent open management ports.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Adaptive application controls
Why it's wrong here
This feature controls which applications can run on your VMs, not inbound port access.
✓
Just-in-time (JIT) VM access
Why this is correct
JIT locks down inbound traffic to VMs and allows authorized users to request temporary access to specific ports, which is automatically revoked after a set time.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
File Integrity Monitoring (FIM)
Why it's wrong here
FIM monitors changes to files and registries on VMs, not inbound access.
✗
Security alerts
Why it's wrong here
Security alerts notify about threats but do not control inbound access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse 'just-in-time VM access' with 'adaptive application controls' because both are Defender for Cloud features that involve 'control' and 'access,' but JIT specifically manages network port access while adaptive controls manage application execution.
Detailed technical explanation
How to think about this question
Under the hood, JIT VM access works by integrating with Azure Network Security Groups (NSGs) or Azure Firewall policies. When an admin requests access, Defender for Cloud creates a specific 'allow' rule for the source IP and port (e.g., 3389) with a lower priority than the default 'deny' rule, and sets a time-to-live (TTL) on the rule. After the TTL expires, the rule is automatically deleted, restoring the deny state. In a real-world scenario, this prevents brute-force attacks on RDP/SSH ports while still enabling emergency maintenance without permanently exposing the VM.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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-900 question in full detail.
Describe the capabilities of Microsoft security solutions — This question tests Describe the capabilities of Microsoft security solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Just-in-time (JIT) VM access — Just-in-time (JIT) VM access is the correct feature because it specifically addresses the need to block inbound RDP (port 3389) traffic by default while allowing administrators to request temporary, time-bound access. When a request is approved, JIT dynamically modifies the network security group (NSG) to open the port for a specified duration, then automatically reverts the rule to deny all inbound traffic after the time expires. This directly minimizes the attack surface by eliminating persistent open management ports.
What should I do if I get this SC-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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