220-1101 Virtualization and Cloud Computing Practice Question
A company implements a private cloud where multiple departments share the same physical hardware. The cloud platform ensures that each department's virtual machines are isolated from each other and that resources are dynamically allocated based on demand. Which cloud characteristic BEST describes this arrangement?
⚠ Common exam trap
CompTIA often tests the distinction between resource pooling and rapid elasticity, where candidates mistakenly choose rapid elasticity because they focus on the 'dynamically allocated based on demand' phrase, but the key differentiator is the sharing of physical hardware among multiple tenants, which is resource pooling.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Resource pooling
Resource pooling is the correct answer because the scenario describes multiple departments sharing the same physical hardware while their virtual machines are isolated from each other. This is the defining characteristic of resource pooling in cloud computing, where computing resources (compute, storage, network) are aggregated to serve multiple consumers using a multi-tenant model, with physical and virtual resources dynamically assigned and reassigned according to demand. The isolation between departments is achieved through hypervisor-level virtualization (e.g., VMware vSphere, Microsoft Hyper-V) which enforces strict separation of virtual machines on shared hardware.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Resource pooling
Why this is correct
Resource pooling is correct because it describes the aggregation of physical infrastructure—such as compute, storage, and networking—into a single virtualized pool that can be dynamically assigned to multiple departments. This model achieves economies of scale by sharing the same underlying hardware while maintaining logical isolation via virtual machines, VLANs, or container namespaces. The scenario of multiple departments in a private cloud is the textbook definition of resource pooling, as each consumer receives resources from a common pool without awareness of the physical location or other tenants.
- ✗
Rapid elasticity
Why it's wrong here
Rapid elasticity is not the correct answer because it focuses on the ability to scale resources up or down quickly in response to fluctuating demand, often automatically. While elasticity is a core cloud trait, it does not inherently involve the sharing or partitioning of resources among multiple departments. The scenario emphasizes the physical infrastructure being shared across departments, not the speed or dynamic nature of scaling. Thus elasticity is a valid cloud characteristic but not the one that matches the described setup.
- ✗
Measured service
Why it's wrong here
Measured service is not the correct answer because it pertains to metering and monitoring resource usage for purposes such as billing, chargeback, or capacity optimization. This feature provides transparency and accountability by tracking metrics like CPU hours, storage GB, or bandwidth consumed, but it does not describe how resources are shared or isolated among consumers. The scenario highlights the mechanism of sharing physical infrastructure while keeping departments logically separate, which is a different concept from usage measurement. Therefore, measured service would be relevant for cost allocation but not for the pooling aspect highlighted in the question.
- ✗
On-demand self-service
Why it's wrong here
On-demand self-service is not the correct answer because it describes the ability for end users to provision computing capabilities automatically, without requiring manual intervention from IT administrators. This characteristic is about user autonomy and rapid provisioning, typically through a portal or API, but it does not explain how underlying physical resources are collectively utilized by multiple departments. The question focuses on the sharing and isolation of infrastructure among departments, which is the essence of resource pooling, not the self-service provisioning mechanism. Hence, self-service is an important cloud feature but unrelated to the primary scenario described.
Go deeper
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Metered Network Connections
Key term
Software as a Service
Software as a Service (SaaS) is a cloud computing model where users access software applications over the internet on a subscription basis, without installing or maintaining the software locally.
Key term
Anything As A Service
A model where you rent any IT resource or service over the internet instead of owning it.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1101 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1101 exam.