The answer is physical security of the data center. This is correct because under the shared responsibility model for IaaS, Microsoft manages the physical infrastructure—including environmental controls, hardware maintenance, and physical access—while the customer retains responsibility for securing their virtual machines, operating systems, and applications. On the SC-900 exam, this concept tests your understanding of how responsibility shifts during an IaaS migration, often appearing in scenario-based questions where a company moves on-premises VMs to Azure. A common trap is confusing IaaS with PaaS or SaaS, where Microsoft takes on more security layers; remember that in IaaS, the customer still handles the guest OS and data. For a quick memory tip, think “IaaS = Infrastructure, so Microsoft handles the building; you handle what’s inside.”
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 virtual machines to Azure Infrastructure-as-a-Service (IaaS). Which security responsibility primarily shifts from the customer to Microsoft during this migration?
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
When migrating on-premises virtual machines to Azure IaaS, Microsoft takes over responsibility for the physical security of the data centers, including environmental controls, hardware maintenance, and physical access controls. This is a fundamental shift from the customer's responsibility under the shared responsibility model, where the customer previously managed the physical infrastructure on-premises.
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
Why this is correct
Correct. In IaaS, Microsoft is responsible for the physical data center security, including access control, surveillance, and environmental controls.
Related concept
Read the scenario before looking for a memorised answer.
✗
Patching the guest operating system
Why it's wrong here
Incorrect. Patching the guest OS is the customer's responsibility in IaaS, as they manage the operating system and applications.
✗
Managing user access to the virtual machines
Why it's wrong here
Incorrect. The customer retains responsibility for managing user accounts, access policies, and authentication for their VMs.
✗
Configuring the firewall rules for the virtual network
Why it's wrong here
Incorrect. Configuring network security groups and firewall rules is the customer's responsibility, as they define traffic controls.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the shared responsibility model for IaaS with PaaS or SaaS, mistakenly thinking Microsoft handles guest OS patching or network configuration, when in fact those remain customer responsibilities in IaaS.
Detailed technical explanation
How to think about this question
Under the shared responsibility model for IaaS, Microsoft secures the physical datacenter, network infrastructure, and hypervisor layer, while the customer is responsible for securing the guest OS, applications, data, and network configurations. This distinction is codified in the Azure Security Benchmark and the Microsoft Service Trust Portal, where physical security controls like badge access, biometrics, and surveillance are audited under SOC 2 and ISO 27001. A real-world scenario: if a customer migrates a SQL Server VM, they must still patch the SQL Server software and configure firewall rules, but Microsoft ensures the physical server hosting the VM is locked in a secure cage.
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 — When migrating on-premises virtual machines to Azure IaaS, Microsoft takes over responsibility for the physical security of the data centers, including environmental controls, hardware maintenance, and physical access controls. This is a fundamental shift from the customer's responsibility under the shared responsibility model, where the customer previously managed the physical infrastructure on-premises.
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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