AZ-900 Describe cloud concepts Practice Test 18 — 15 Questions

Question 1

Which of the following demonstrates how 'increased speed and agility' helps a development team in the cloud?

Accepted Answer

Provisioning a complete test environment in minutes to test a new feature. Cloud computing enables self-service provisioning of resources via APIs, allowing a development team to spin up a complete test environment in minutes without waiting for hardware procurement. This directly demonstrates 'increased speed and agility' by reducing the time from idea to deployment, a core benefit of Infrastructure as a Service (IaaS) and Platform as a Service (PaaS) models.

Answer

Waiting 6 weeks for procurement to buy servers for a new project

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Reducing the team size needed for development projects

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Automatically fixing bugs in production code without developer intervention

Question 2

What is the role of a cloud 'service level objective' (SLO) versus a 'service level agreement' (SLA)?

Accepted Answer

SLA is the provider's contractual guarantee; SLO is an internal organizational goal. An SLA is a legally binding contract between a cloud provider and a customer that specifies guaranteed uptime, performance, and credits for breaches, while an SLO is an internal target (e.g., 99.9% uptime) that the provider sets to meet or exceed the SLA. The SLA defines the minimum commitment; the SLO is a stricter internal goal used to drive operational excellence and avoid SLA violations.

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SLA and SLO are identical terms for the same concept

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SLO is the provider's contractual guarantee; SLA is the customer's internal target

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SLA defines performance; SLO defines security requirements

Question 3

Which cloud model provides the greatest degree of control over the underlying infrastructure?

Accepted Answer

Private cloud. The private cloud model provides the greatest degree of control over the underlying infrastructure because it is dedicated to a single organization, allowing full customization of hardware, virtualization layers, networking, and security configurations. In contrast, public clouds abstract infrastructure management away from the customer, limiting control to the application and data layers only.

Answer

Public cloud

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Hybrid cloud

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Community cloud

Question 4

What does 'high availability' mean in the context of cloud computing?

Accepted Answer

A system's ability to remain operational with minimal downtime. High availability in cloud computing refers to a system's ability to remain operational and accessible with minimal downtime, typically measured in terms of uptime percentage (e.g., 99.99% availability). This is achieved through redundant infrastructure, failover mechanisms, and service-level agreements (SLAs) that guarantee a certain level of continuity. Option B directly captures this core definition, distinguishing it from other cloud concepts like scalability or geo-replication.

Answer

The ability to deploy resources globally across multiple regions

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The ability to automatically scale resources based on demand

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Storing data in multiple geographic locations

Question 5

Which of the following is an advantage of cloud computing related to speed of deployment?

Accepted Answer

Resources can be provisioned in minutes rather than weeks. Cloud computing enables rapid provisioning of resources through self-service portals and automation, allowing virtual machines, storage, and networks to be deployed in minutes via APIs or management consoles. This contrasts with on-premises environments where hardware procurement, racking, and configuration can take weeks. The speed of deployment is a core agility benefit of the cloud, directly supporting faster time-to-market for applications.

Answer

You never need to patch operating systems

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You own the physical hardware

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All data is automatically encrypted at rest

Question 6

What is the primary difference between CapEx (Capital Expenditure) and OpEx (Operational Expenditure) in the context of IT spending?

Accepted Answer

CapEx requires large upfront investment in physical assets; OpEx is pay-as-you-go spending. CapEx involves a significant upfront investment in physical IT assets like servers, storage, and networking equipment, which are then depreciated over their useful life. OpEx, in contrast, aligns with cloud services where you pay only for what you consume (e.g., per-hour VM usage, per-GB storage), with no large initial outlay. This fundamental shift from owning to renting infrastructure is a core concept in Azure and cloud computing.

Answer

CapEx is recurring monthly spending; OpEx is a one-time purchase

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CapEx is tax-deductible immediately; OpEx is depreciated over years

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CapEx and OpEx are identical for cloud services

Question 7

A startup wants to use cloud services to launch their product quickly without investing in hardware. Which cloud benefit does this BEST describe?

Accepted Answer

Agility and speed to market. The startup's need to launch quickly without upfront hardware investment directly maps to the cloud benefit of agility and speed to market. Azure's pay-as-you-go model and instant provisioning of virtual machines (e.g., Azure VMs) or platform services (e.g., Azure App Service) eliminate procurement delays, allowing deployment in minutes rather than weeks. This is the core value proposition of cloud computing for rapid product iteration.

Answer

Fault tolerance

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Disaster recovery

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Geographic distribution

Question 8

What does the term 'fault tolerance' mean in cloud computing?

Accepted Answer

The ability to continue operating despite component failures. Fault tolerance is the ability of a system to continue operating without interruption when one or more of its components fail. In Azure, this is achieved through redundancy at multiple layers—such as using Availability Zones or redundant hardware—so that a failure in a single server, network path, or power supply does not bring down the entire workload. This is distinct from high availability, which focuses on minimizing downtime, whereas fault tolerance aims for zero downtime even during failures.

Answer

The ability to scale resources up and down automatically

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The ability to recover data after accidental deletion

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The ability to deploy applications across multiple regions

Question 9

Which of the following statements accurately describes the shared responsibility model for SaaS applications?

Accepted Answer

The provider manages everything; the customer manages only data and user access. In the shared responsibility model for SaaS (Software as a Service), the cloud provider is responsible for the entire underlying infrastructure, including the application, runtime, operating system, and physical security. The customer's responsibilities are limited to managing their own data, configuring user access, and ensuring proper usage of the application. This model maximizes the provider's control, minimizing the customer's operational overhead.

Answer

The customer manages the application, runtime, and operating system

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The customer and provider share equal responsibility for all components

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The customer manages the runtime and middleware

Question 10

A company operates on-premises servers that they own. They are considering moving to Azure. Which cloud benefit would MOST directly reduce their total cost of ownership?

Accepted Answer

Eliminating hardware purchase and maintenance costs. Moving to Azure eliminates the need to purchase, maintain, and eventually replace physical servers, which directly reduces capital expenditure (CapEx) and operational costs related to hardware lifecycle management. This is the most direct way to lower total cost of ownership (TCO) when transitioning from on-premises infrastructure to a public cloud model.

Answer

Automatic compliance with all regulations

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Guaranteed zero downtime for all services

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Free support for all Azure services

Question 11

Which term describes the cloud's ability to quickly provision and de-provision resources to meet demand without human intervention?

Accepted Answer

Elasticity. Elasticity is the correct term because it specifically refers to the cloud's ability to automatically scale resources up or down in response to fluctuating demand, without requiring manual intervention. This is a core characteristic of cloud computing, enabling dynamic provisioning and de-provisioning of compute, storage, or network resources based on real-time metrics like CPU utilization or request count.

Answer

High availability

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Fault tolerance

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Disaster recovery

Question 12

What is a key characteristic of the public cloud model?

Accepted Answer

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.

Answer

Resources are dedicated exclusively to one organization

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Resources are always hosted on-premises

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The organization owns all hardware

Question 13

A company's CTO asks why Azure can offer services at lower costs than building an equivalent on-premises solution. Which cloud principle BEST explains this?

Accepted Answer

Economies of scale. Economies of scale is the correct answer because cloud providers like Azure operate massive, standardized data centers that serve millions of customers simultaneously. This allows them to negotiate bulk discounts on hardware, power, and cooling, and to spread fixed operational costs across a vast customer base, resulting in per-unit costs far lower than what a single company would pay for an equivalent on-premises deployment.

Answer

Elasticity

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High availability

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Geo-distribution

Question 14

Which statement BEST describes the benefit of cloud computing's 'predictable costs'?

Accepted Answer

Costs can be forecasted and controlled using consumption-based pricing and planning tools. Predictable costs in cloud computing refer to the ability to forecast and control spending through consumption-based pricing models (pay-as-you-go) and tools like Azure Cost Management + Billing. This allows organizations to estimate costs based on usage patterns, set budgets, and receive alerts, making financial planning more accurate compared to unpredictable capital expenses.

Answer

You always pay the same amount regardless of usage

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Cloud services are always cheaper than on-premises solutions

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Hardware costs are fixed for the contract term

Question 15

A manufacturing company wants to process IoT sensor data locally at their factory floor to reduce latency before sending summarized data to the cloud. Which cloud computing concept does this represent?

Accepted Answer

Edge computing. Edge computing is the correct concept because it involves processing data near the source (the factory floor) rather than sending it to a centralized cloud data center. This reduces latency by performing initial analysis locally, with only summarized results transmitted to the cloud. The scenario explicitly describes local processing to minimize delay, which is the core purpose of edge computing.

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Hybrid cloud

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Public cloud

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Disaster recovery