This MS-900 practice question tests your understanding of describe cloud concepts. 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.
A company wants to deploy a cloud solution where they have the maximum control over the operating system, installed software, and security configurations, but they do not want to manage physical servers or data center facilities. Which cloud service model best meets this requirement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Infrastructure as a Service (IaaS)
Infrastructure as a Service (IaaS) provides virtualized computing resources over the internet, giving the customer full administrative control over the operating system, installed software, and security configurations (e.g., firewall rules, patch management) while the cloud provider manages the physical servers, storage, and networking hardware. This model aligns with the requirement for maximum control without managing physical infrastructure.
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.
✓
Infrastructure as a Service (IaaS)
Why this is correct
IaaS gives the customer full control over the OS and applications while the provider manages the hardware.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Platform as a Service (PaaS)
Why it's wrong here
PaaS abstracts the OS, and the customer only controls their applications, not the underlying OS.
✗
Software as a Service (SaaS)
Why it's wrong here
SaaS provides a complete application managed entirely by the provider, offering minimal control.
✗
Hybrid cloud
Why it's wrong here
Hybrid cloud is a deployment model combining public and private cloud, not a service model defining control level.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the deployment model (Hybrid cloud) with the service model, or they assume PaaS offers more control than it actually does because they overlook the provider-managed OS layer in PaaS.
Detailed technical explanation
How to think about this question
In IaaS, the customer is responsible for guest OS management, including kernel updates, application installation, and security hardening (e.g., configuring iptables or Windows Defender Firewall), while the provider handles hypervisor-level isolation and physical server maintenance. For example, in Microsoft Azure, an IaaS virtual machine gives the customer full control via Remote Desktop Protocol (RDP) or Secure Shell (SSH), but the underlying host OS and fabric are managed by Azure. A subtle behavior is that the customer must also manage virtual network security groups (NSGs) and disk encryption, which are not automatically configured.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-900 question in full detail.
Describe cloud concepts — This question tests Describe cloud concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Infrastructure as a Service (IaaS) — Infrastructure as a Service (IaaS) provides virtualized computing resources over the internet, giving the customer full administrative control over the operating system, installed software, and security configurations (e.g., firewall rules, patch management) while the cloud provider manages the physical servers, storage, and networking hardware. This model aligns with the requirement for maximum control without managing physical infrastructure.
What should I do if I get this MS-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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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