The answer is applying security updates to the guest operating system. This is correct because under the shared responsibility model for IaaS, Microsoft manages the physical host, network, and hypervisor, while the customer retains full control over the guest OS, including patching, configuration, and any applications running inside the virtual machine. On the SC-900 exam, this concept tests your understanding of the division of security duties across cloud service models; a common trap is confusing IaaS with PaaS or SaaS, where the provider handles more of the OS layer. Remember that in IaaS, you are responsible for everything inside the virtual machine—from the guest OS upward. A helpful memory tip is to think of IaaS as a rented server: the landlord (Microsoft) secures the building, but you must lock your own doors and install your own alarm system, meaning you patch the guest OS.
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. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
An organization is moving a virtual machine to Azure Infrastructure as a Service (IaaS). According to the shared responsibility model, which of the following security tasks is the customer responsible for?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Applying security updates to the guest operating system
In an IaaS deployment, the customer retains responsibility for securing the guest operating system, including applying security updates. Microsoft manages the physical infrastructure and hypervisor, while the customer must patch and configure the OS running inside the virtual machine.
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 datacenter
Why it's wrong here
Physical security of the datacenter is the responsibility of the cloud provider (Microsoft), not the customer.
✓
Applying security updates to the guest operating system
Why this is correct
The customer is responsible for securing everything inside the VM, including the guest OS. This includes applying security updates and patches.
Related concept
Read the scenario before looking for a memorised answer.
✗
Maintaining the hypervisor
Why it's wrong here
The hypervisor is part of the virtualization layer managed by the cloud provider. The customer has no access or responsibility for it.
✗
Power and cooling infrastructure
Why it's wrong here
Power and cooling are environmental controls provided and maintained by the cloud provider as part of the physical data center operations.
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 thinking the provider handles all OS-level security, when in fact the customer is responsible for the guest OS in IaaS.
Detailed technical explanation
How to think about this question
The shared responsibility model delineates that for IaaS, the customer controls the guest OS, applications, and data, while the provider secures the physical host, network, and hypervisor. This means the customer must configure firewall rules, apply OS patches (e.g., via Windows Update or Linux package managers), and manage identity and access within the VM. A common real-world scenario is a customer failing to patch the guest OS, leading to vulnerabilities like EternalBlue exploitation, which the provider cannot mitigate.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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: Applying security updates to the guest operating system — In an IaaS deployment, the customer retains responsibility for securing the guest operating system, including applying security updates. Microsoft manages the physical infrastructure and hypervisor, while the customer must patch and configure the OS running inside the virtual machine.
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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