The answer is multi-tenancy, where resources are shared among multiple tenants over the internet. This is the defining characteristic of the public cloud because the provider’s physical infrastructure—servers, storage, and networks—is pooled and logically isolated for each customer using hypervisor-level separation, allowing many organizations to use the same hardware securely. On the Microsoft Azure Fundamentals AZ-900 exam, this concept tests your understanding of the public cloud model versus private or hybrid models; a common trap is confusing multi-tenancy with a lack of security, but remember that isolation is enforced at the hypervisor layer, not the hardware layer. The key memory tip is “shared but separate”—the public cloud shares the infrastructure but keeps your data and workloads isolated from other tenants, which is what enables the provider’s economies of scale and pay-as-you-go pricing.
AZ-900 Describe cloud concepts Practice Question
This AZ-900 practice question tests your understanding of describe cloud concepts. 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.
What is a key characteristic of the public cloud model?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Resources are shared among multiple tenants over the internet
The public cloud model is defined by multi-tenancy, where computing resources such as virtual machines, storage, and networks are shared across multiple customers (tenants) over the internet. Microsoft Azure, AWS, and Google Cloud all operate on this principle, using hypervisor-level isolation to ensure each tenant's data and workloads remain separate. This shared infrastructure enables the cloud provider to achieve economies of scale, offering pay-as-you-go pricing and elastic scalability.
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.
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Resources are dedicated exclusively to one organization
Why it's wrong here
Dedicated exclusive resources describe private cloud, not public cloud.
✓
Resources are shared among multiple tenants over the internet
Why this is correct
Public cloud is characterized by shared, multi-tenant infrastructure delivered over the internet by a third-party provider.
Related concept
Read the scenario before looking for a memorised answer.
✗
Resources are always hosted on-premises
Why it's wrong here
On-premises hosting is the opposite of public cloud — public cloud resources are in the provider's datacenters.
✗
The organization owns all hardware
Why it's wrong here
In public cloud, the provider owns the hardware — customers rent capacity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'shared resources' with 'shared security' or 'no isolation,' but in reality, public cloud providers implement strong multi-tenant isolation through hypervisors, virtual networks, and encryption, making the model secure despite resource sharing.
Detailed technical explanation
How to think about this question
Under the hood, public cloud providers use hypervisors (e.g., Microsoft Hyper-V in Azure) to create virtual machines that are isolated at the hardware level via technologies like Intel VT-x or AMD-V. Network isolation is achieved through software-defined networking (SDN) and virtual LANs (VLANs) or overlay networks like VXLAN, ensuring that tenant traffic is segmented even though physical NICs and switches are shared. A real-world scenario: a single Azure region may host thousands of tenants on the same physical servers, yet each tenant's virtual network is completely isolated using Network Security Groups (NSGs) and Azure Virtual Network (VNet) peering rules.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-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: Resources are shared among multiple tenants over the internet — The public cloud model is defined by multi-tenancy, where computing resources such as virtual machines, storage, and networks are shared across multiple customers (tenants) over the internet. Microsoft Azure, AWS, and Google Cloud all operate on this principle, using hypervisor-level isolation to ensure each tenant's data and workloads remain separate. This shared infrastructure enables the cloud provider to achieve economies of scale, offering pay-as-you-go pricing and elastic scalability.
What should I do if I get this AZ-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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