AZ-900 Describe cloud concepts Practice Test 19 — 15 Questions

Question 1

Which of the following is the cloud provider's responsibility under the shared responsibility model for Infrastructure as a Service (IaaS)?

Accepted Answer

Physical datacenter and host hardware. In the shared responsibility model for IaaS, the cloud provider is responsible for the physical infrastructure, including the datacenter, host hardware, network, and storage. This is because the customer has no physical access to these components and cannot manage them. The provider ensures the underlying hardware is maintained, secured, and operational.

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Operating system updates and patches

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Application data backup

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Network security group configuration

Question 2

What does the term 'scalability' mean in the context of cloud computing?

Accepted Answer

The ability to increase or decrease resources to match workload demand. Scalability in cloud computing refers to the ability to dynamically adjust computing resources—such as virtual machines, storage, or database throughput—up or down to match fluctuating workload demands. This is a core cloud characteristic that enables cost efficiency by paying only for what you use, and it is typically implemented through horizontal scaling (adding/removing instances) or vertical scaling (resizing an instance). In Azure, this is achieved via features like Virtual Machine Scale Sets or Azure App Service auto-scale rules.

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The ability to automatically recover from failures without data loss

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The ability to replicate data across multiple geographic regions

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The ability to deploy applications with no downtime

Question 3

Which cloud deployment model combines on-premises infrastructure with public cloud resources, allowing data and applications to be shared between them?

Accepted Answer

Hybrid cloud. A hybrid cloud deployment model explicitly combines on-premises infrastructure (private cloud or local datacenter) with public cloud resources, enabling data and application portability through technologies like VPNs, dedicated interconnects, or orchestration tools. This model allows workloads to burst to the public cloud during peak demand while keeping sensitive data on-premises, fulfilling the scenario described in the question.

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Public cloud

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Private cloud

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Community cloud

Question 4

What is the purpose of Azure Service Level Agreements (SLAs)?

Accepted Answer

To define Microsoft's commitments for uptime and the remedies if not met. Azure SLAs define Microsoft's formal commitments regarding service availability (uptime) and connectivity. They specify the guaranteed uptime percentage (e.g., 99.9% for most virtual machines) and outline the service credits (remedies) customers receive if Microsoft fails to meet those commitments. This is not a guarantee of zero downtime but a contractual promise with financial recourse.

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To guarantee Microsoft will never have any downtime

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To prevent customers from migrating to other cloud providers

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To specify how Azure handles customer data

Question 5

Which cloud model is MOST appropriate for an organization that needs complete control over their infrastructure and cannot share resources with other organizations due to regulatory requirements?

Accepted Answer

Private cloud. A private cloud is dedicated to a single organization, providing complete control over infrastructure and ensuring no resource sharing with other tenants. This model meets regulatory requirements that mandate data isolation and compliance, as the organization can configure security policies, network segmentation, and access controls without multi-tenant risks.

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Public cloud

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Hybrid cloud

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Multi-cloud

Question 6

What is the main benefit of cloud computing's 'economies of scale' for customers?

Accepted Answer

Customers benefit from lower costs because the provider buys at massive scale. Economies of scale in cloud computing means that cloud providers like Microsoft Azure purchase vast amounts of hardware, networking equipment, and power at significantly reduced per-unit costs due to bulk buying. These savings are passed down to customers in the form of lower pay-as-you-go prices, making cloud services more affordable than if each customer had to procure and maintain their own infrastructure.

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Customers can use unlimited resources without any cost

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All customers get the same hardware regardless of need

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Cloud providers always have the latest hardware immediately

Question 7

Which statement accurately describes the consumption-based pricing model in cloud computing?

Accepted Answer

You pay only for the resources you actually use. The consumption-based pricing model, also known as pay-as-you-go, is a core financial model in cloud computing where you are billed only for the specific resources you consume (e.g., compute hours, storage GB, data transfer). This model eliminates upfront capital expenditure and allows costs to scale dynamically with usage, directly aligning expenses with actual consumption rather than capacity.

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You pay a flat monthly fee regardless of how much you use

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You must commit to a one-year contract

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Cloud resources are always free during off-peak hours

Question 8

What distinguishes a 'region pair' in Azure?

Accepted Answer

Two Azure regions paired for disaster recovery and update isolation. A region pair consists of two Azure regions within the same geography, at least 300 miles apart, that are directly connected via high-speed fiber and are used for disaster recovery and planned maintenance isolation. This design ensures that only one region in a pair is updated at a time, reducing the risk of simultaneous failures across both regions.

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Two datacenters within the same city connected by high-speed fiber

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Two subscriptions in the same Azure AD tenant

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Primary and secondary zones within a single Azure region

Question 9

Which cloud computing characteristic allows a single set of physical hardware to serve multiple customers with isolated virtual environments?

Accepted Answer

Multi-tenancy. Multi-tenancy is the cloud computing characteristic that enables a single set of physical hardware to host multiple customers (tenants) while keeping their virtual environments isolated from one another. This is achieved through hypervisor-level virtualization, where each tenant runs in its own virtual machine (VM) with dedicated memory, CPU, and storage allocations, preventing cross-tenant access. In Azure, multi-tenancy is fundamental to the public cloud model, allowing shared infrastructure without compromising security or privacy.

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High availability

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Geo-distribution

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Elasticity

Question 10

What does 'disaster recovery' mean in cloud computing, and how does Azure support it?

Accepted Answer

The ability to restore systems and data after a major outage, supported by services like Azure Site Recovery. Disaster recovery (DR) in cloud computing refers to the strategies and processes used to restore IT systems and data after a catastrophic failure, such as a natural disaster or large-scale outage. Azure supports DR primarily through Azure Site Recovery (ASR), which orchestrates replication, failover, and failback of virtual machines and workloads between Azure regions or from on-premises to Azure, ensuring business continuity with defined recovery point objectives (RPO) and recovery time objectives (RTO).

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Disaster recovery means the cloud never experiences any failures

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Disaster recovery is only relevant for on-premises systems

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Azure automatically protects all data with no configuration required

Question 11

What does 'geo-distribution' mean as a benefit of cloud computing?

Accepted Answer

Having datacenters around the world to serve users with low latency. Geo-distribution in cloud computing refers to the global footprint of a cloud provider's infrastructure, with datacenters deployed across multiple geographic regions. This allows applications to be hosted closer to end users, reducing network latency and improving the user experience. It also supports data residency requirements and disaster recovery by replicating data across regions.

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The ability to automatically scale resources up and down

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The ability to recover from hardware failures automatically

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Paying only for what you consume

Question 12

Which of the following is NOT a benefit of moving to cloud computing?

Accepted Answer

Elimination of all internet dependencies. Cloud computing inherently relies on internet connectivity to access resources and services. While some hybrid or private cloud setups may use dedicated connections like Azure ExpressRoute, the elimination of all internet dependencies is not a benefit—in fact, cloud services require network connectivity, and any claim of removing that dependency is false.

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Reduced capital expenditure on hardware

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Ability to scale resources on demand

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Access to the latest hardware and technology

Question 13

What is the relationship between an Azure tenant, a subscription, and a resource group?

Accepted Answer

A tenant contains subscriptions, subscriptions contain resource groups, resource groups contain resources. The Azure hierarchy is strictly defined: an Azure tenant (representing an organization's identity in Microsoft Entra ID) contains one or more subscriptions, each subscription contains one or more resource groups, and each resource group contains resources like VMs or databases. This layered structure enables management, billing, and access control at each level.

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A subscription contains tenants, tenants contain resource groups

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Resource groups and subscriptions are the same thing

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A tenant is inside a subscription

Question 14

Which term describes the practice of deploying resources across multiple Azure availability zones to protect against datacenter-level failures?

Accepted Answer

Zone-redundant deployment. Zone-redundant deployment (B) is the correct term because it specifically refers to replicating resources across multiple Azure availability zones within a single Azure region. Availability zones are physically separate datacenters with independent power, cooling, and networking, so deploying across them protects against a single datacenter-level failure while keeping the application within the same low-latency region.

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Geo-redundancy

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Horizontal scaling

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Disaster recovery

Question 15

What does 'reliability' mean as a cloud benefit?

Accepted Answer

The platform is designed for consistent performance and rapid recovery from failures. Reliability in cloud terms means the platform is engineered for consistent, predictable performance and can recover quickly from failures through redundancy, fault tolerance, and automated failover. It does not mean zero downtime—it means resilience and rapid recovery when incidents occur. This is distinct from availability (uptime percentage) and from backup (data protection).

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The cloud is always 100% available with no interruptions ever

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All data is automatically backed up to multiple locations daily

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Security vulnerabilities are never present in cloud services