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Cloud Computing Concepts

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Question 1

In the cloud Shared Responsibility Model, the cloud provider is always responsible for the security [[blank1]] the cloud (physical infrastructure), while the customer is responsible for security [[blank2]] the cloud (data, access, applications).

Explanation

AWS popularized the phrase "Security OF the cloud vs. security IN the cloud." The provider secures the physical data centers, hardware, hypervisors, and networking infrastructure. The customer secures their data, user access controls, encryption, OS configurations (for IaaS), and application code. Understanding this division is critical for cloud security certifications (AWS SAA, Azure AZ-900) and compliance.

Question 2

The three primary cloud service models are IaaS, PaaS, and [[blank1]].

Explanation

The three foundational cloud service models are: IaaS (Infrastructure as a Service) — provides virtualized infrastructure; PaaS (Platform as a Service) — provides a platform for application development; and SaaS (Software as a Service) — delivers ready-to-use applications. These are sometimes visualized as a stack, with IaaS at the bottom and SaaS at the top, each layer managing more on behalf of the customer.

Question 3

CapEx (Capital Expenditure) is the traditional on-premises model where you buy hardware upfront, while OpEx (Operational Expenditure) is the cloud model where you pay for services as ongoing operating costs.

Answer choices

  • A. True (Correct)

  • B. False

Explanation

Traditional IT uses CapEx — you buy servers, networking equipment, and data center facilities upfront (large one-time costs). Cloud computing converts infrastructure costs to OpEx — you pay monthly/hourly for services you actually use, similar to paying for electricity or a subscription. This shift from CapEx to OpEx is a major financial driver of cloud adoption, as it reduces upfront investment and aligns costs with actual usage.

Question 4

In cloud computing, the practice of distributing workloads across multiple Availability Zones to ensure the application remains available if one zone fails is called [[blank1]] [[blank2]].

Explanation

Deploying across multiple Availability Zones (AZs) is a fundamental high availability strategy. Each AZ is in a separate physical facility with independent power, cooling, and networking. If one AZ experiences an outage, the application continues running from other AZs. This is a best practice for production cloud deployments and is supported by load balancers that route traffic to healthy instances.

Question 5

The concept of "high availability" and "fault tolerance" mean the same thing in cloud architecture.

Answer choices

  • A. True

  • B. False (Correct)

Explanation

While related, they differ: High Availability (HA) means a system is designed to minimize downtime and maximize uptime (e.g., 99.99% uptime = ~52 minutes downtime/year), often through redundancy and failover. Brief outages may occur during failover. Fault Tolerance means the system continues operating WITHOUT ANY interruption even when components fail, typically achieved through real-time redundancy where multiple active systems are running simultaneously. Fault tolerance is a higher standard than high availability.