SC-900 Practice Question: Describe the concepts of security, compliance, and identity
This SC-900 practice question tests your understanding of describe the concepts of security, compliance, and identity. 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 is migrating its on-premises applications to Azure Infrastructure-as-a-Service (IaaS). According to the shared responsibility model, which of the following security responsibilities shifts from the customer to Microsoft during this migration?
Physical security of the data center infrastructure
Microsoft secures the physical data centers with access controls, surveillance, and environmental protections. This responsibility is always with the cloud provider.
B
Configuring network security groups (NSGs)
Why wrong: In IaaS, the customer is responsible for configuring NSGs and managing network traffic within their virtual networks.
C
Patching the operating system on virtual machines
Why wrong: The customer must patch the guest OS and any installed software on their VMs in an IaaS deployment.
D
Managing user identities and access to the application
Why wrong: Identity management remains the customer's responsibility regardless of the cloud service model.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Physical security of the data center infrastructure
When migrating on-premises applications to Azure IaaS, the shared responsibility model shifts physical security responsibilities—such as data center access controls, environmental controls, and hardware security—from the customer to Microsoft. Microsoft is responsible for the physical security of all Azure data centers, including perimeter security, surveillance, and facility access management, which were previously the customer's responsibility in their own on-premises environment.
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.
✓
Physical security of the data center infrastructure
Why this is correct
Microsoft secures the physical data centers with access controls, surveillance, and environmental protections. This responsibility is always with the cloud provider.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configuring network security groups (NSGs)
Why it's wrong here
In IaaS, the customer is responsible for configuring NSGs and managing network traffic within their virtual networks.
✗
Patching the operating system on virtual machines
Why it's wrong here
The customer must patch the guest OS and any installed software on their VMs in an IaaS deployment.
✗
Managing user identities and access to the application
Why it's wrong here
Identity management remains the customer's responsibility regardless of the cloud service model.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse IaaS with PaaS or SaaS, mistakenly believing that Microsoft takes responsibility for OS patching or network security in IaaS, when in fact those remain customer responsibilities.
Detailed technical explanation
How to think about this question
Under the shared responsibility model for IaaS, Microsoft is responsible for the 'physical host' layer, including hardware, storage, networking, and the hypervisor, while the customer manages everything above the hypervisor, including the guest OS, applications, and network controls. This division is explicitly defined in Microsoft's documentation and aligns with the NIST SP 800-145 definition of IaaS, where the cloud provider controls the physical infrastructure and the customer retains control over the operating system, storage, and deployed applications. A common real-world scenario is a customer migrating a legacy application to Azure VMs and assuming Microsoft will patch the OS, which leads to compliance failures if not addressed.
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 concepts of security, compliance, and identity — This question tests Describe the concepts of security, compliance, and identity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Physical security of the data center infrastructure — When migrating on-premises applications to Azure IaaS, the shared responsibility model shifts physical security responsibilities—such as data center access controls, environmental controls, and hardware security—from the customer to Microsoft. Microsoft is responsible for the physical security of all Azure data centers, including perimeter security, surveillance, and facility access management, which were previously the customer's responsibility in their own on-premises environment.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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