MS-900 Describe cloud concepts Practice Test 6 — 15 Questions

Question 1

A company needs a dedicated, private network connection between its on-premises data center and Microsoft's cloud infrastructure to support a hybrid deployment with low latency and high reliability. The connection must not traverse the public internet. Which service should they use?

Accepted Answer

Azure ExpressRoute. Azure ExpressRoute is the correct choice because it provides a dedicated, private network connection from an on-premises data center directly into Microsoft's cloud infrastructure, bypassing the public internet entirely. This ensures low latency, high reliability, and consistent performance for hybrid deployments, as the traffic traverses a private MPLS or Ethernet link rather than the unpredictable internet.

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Azure VPN Gateway

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Azure Virtual WAN

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Microsoft Entra ID Application Proxy

Question 2

A colleague says, 'The public cloud is cheaper because you only pay for the resources you use, like compute hours or storage space.' Which cloud computing characteristic directly supports this pay-as-you-go model?

Accepted Answer

Measured service. Option C is correct because measured service is the cloud computing characteristic that enables a pay-as-you-go model by metering resource usage (e.g., compute hours, storage GB-months, outbound data transfer) and providing transparent billing based on actual consumption. This allows providers like Azure to charge only for what is used, directly supporting the colleague's statement that the public cloud is cheaper because you pay only for resources consumed.

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Rapid elasticity

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Broad network access

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On-demand self-service

Question 3

Which cloud computing characteristic allows a company to access resources like storage and databases from any device with an internet connection without needing to manage the physical infrastructure?

Accepted Answer

Broad network access. Broad network access is the correct answer because it describes the ability to access cloud resources (such as storage and databases) over the network via standard protocols (e.g., HTTP/HTTPS, SMB, NFS) from any device (laptop, smartphone, tablet) with an internet connection, without requiring the customer to manage the underlying physical infrastructure. This characteristic is defined by NIST SP 800-145 as 'capabilities are available over the network and accessed through standard mechanisms that promote use by heterogeneous thin or thick client platforms.'

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Rapid elasticity

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Measured service

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Resource pooling

Question 4

A cloud provider uses a multi-tenant model where physical and virtual resources are dynamically assigned and reassigned according to consumer demand. This is an example of which cloud computing characteristic?

Accepted Answer

Resource pooling. Resource pooling is the correct answer because the multi-tenant model described involves the cloud provider pooling physical and virtual resources (e.g., compute, storage, network) to serve multiple consumers, with resources dynamically assigned and reassigned based on demand. This is a core characteristic of cloud computing as defined by NIST SP 800-145, where the provider's resources are pooled to achieve economies of scale while maintaining logical isolation between tenants.

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Rapid elasticity

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On-demand self-service

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Measured service

Question 5

A company uses a cloud storage service that automatically increases its storage capacity without any manual intervention as new files are added. This behavior is an example of which cloud computing characteristic?

Accepted Answer

Rapid elasticity. The scenario describes storage capacity automatically increasing as new files are added, which is the essence of rapid elasticity. This cloud characteristic allows resources to scale out and in automatically, often to the point where the user perceives unlimited capacity, without requiring manual provisioning or intervention.

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On-demand self-service

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Broad network access

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Resource pooling

Question 6

A company deploys a custom application on a cloud platform where they manage the operating system and runtime environment, but the cloud provider manages the underlying physical infrastructure, storage, and networking. Which cloud service model is being used?

Accepted Answer

Infrastructure as a Service (IaaS). The scenario describes a model where the customer manages the operating system and runtime environment, while the cloud provider handles the physical infrastructure, storage, and networking. This aligns precisely with Infrastructure as a Service (IaaS), as IaaS provides virtualized computing resources (e.g., virtual machines) where the customer retains control over the OS, middleware, and applications, but the provider manages the underlying hardware, hypervisor, and physical network.

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Platform as a Service (PaaS)

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Software as a Service (SaaS)

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Function as a Service (FaaS)

Question 7

A development team uses a cloud service to run applications where the provider manages the runtime environment, operating system, and middleware. The team only writes and uploads code. Which service model are they using?

Accepted Answer

PaaS (Platform as a Service). The scenario describes the team writing and uploading code while the provider manages the runtime environment, operating system, and middleware. This is the defining characteristic of Platform as a Service (PaaS), where the cloud provider abstracts the underlying infrastructure and platform layers, allowing developers to focus solely on application code. In PaaS, the provider handles OS patching, runtime updates, and middleware configuration, which matches the description exactly.

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IaaS (Infrastructure as a Service)

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SaaS (Software as a Service)

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FaaS (Function as a Service)

Question 8

A company uses a cloud service where they pay only for the compute hours their virtual machines run. They can increase or decrease the number of VMs instantly based on demand. Which two cloud computing characteristics are demonstrated? (Choose two.)

Accepted Answer

Rapid elasticity. B is correct because rapid elasticity allows the company to instantly increase or decrease the number of virtual machines based on demand, scaling resources up or down automatically. C is correct because measured service ensures that the company pays only for the compute hours their VMs run, with usage metered and billed accordingly.

Answer

On-demand self-service

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Resource pooling

Question 9

A company is deploying a cloud solution where they have the ability to quickly scale up resources during peak demand and scale down during off-peak hours, paying only for what they use. They also need the provider to automatically manage the underlying platform, including patching the operating system. Which combination of cloud characteristics and service model best describes this scenario?

Accepted Answer

Elasticity and PaaS. Option A is correct because the scenario describes elasticity (the ability to scale resources up and down automatically based on demand) and Platform as a Service (PaaS), where the provider manages the underlying platform, including OS patching. Elasticity is a key cloud characteristic that enables dynamic scaling, and PaaS abstracts infrastructure management, aligning perfectly with the requirement for automatic platform maintenance.

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Scalability and IaaS

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Rapid elasticity and SaaS

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Measured service and PaaS

Question 10

A business wants to use a cloud solution where they can scale computing resources up or down automatically based on demand and only pay for what they use. The cloud provider manages the underlying hardware. Which two cloud characteristics are being described? (Choose two.)

Accepted Answer

Elasticity. Elasticity is correct because it describes the ability to automatically scale computing resources up or down based on demand, which is a key characteristic of cloud computing. The scenario explicitly states that resources scale automatically, which aligns with elasticity rather than just the ability to scale (scalability). Measured service is correct because the business pays only for what they use, which is the pay-per-use billing model enabled by metering resource consumption.

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Scalability

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High availability

Question 11

Which cloud computing characteristic allows users to be billed only for the resources they consume, such as processing power, storage, or bandwidth?

Accepted Answer

Measured service. Measured service is the cloud computing characteristic that enables usage-based billing by monitoring, controlling, and reporting resource consumption (e.g., CPU hours, GB of storage, or data transfer) at a granular level. This metering capability allows providers to charge customers only for what they actually use, rather than a flat fee, and is typically implemented via telemetry and billing APIs.

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On-demand self-service

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Broad network access

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Resource pooling

Question 12

A development team wants to deploy a custom web application to the cloud. They want to upload their code and let the cloud provider handle server infrastructure, operating system updates, and automatic scaling. Which cloud service model best fits this requirement?

Accepted Answer

Platform as a Service (PaaS). Platform as a Service (PaaS) is the correct choice because it provides a managed hosting environment where the development team can upload their custom web application code without managing the underlying server infrastructure, operating system updates, or scaling. Azure App Service, a PaaS offering, automatically handles OS patching, load balancing, and auto-scaling based on demand, aligning perfectly with the requirement to let the cloud provider handle these tasks.

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Infrastructure as a Service (IaaS)

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Software as a Service (SaaS)

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On-premises deployment

Question 13

An e-commerce company hosts its website on a public cloud IaaS platform. The site experiences varying traffic throughout the year. The cloud provider automatically adds more virtual servers during peak traffic and removes them when demand drops. The company only pays for the resources used during each period. Which two cloud characteristics are demonstrated? (Choose two.)

Accepted Answer

Rapid elasticity. Rapid elasticity is demonstrated because the cloud provider automatically scales virtual servers up or down in response to varying traffic, which is a key characteristic of cloud computing where resources can be provisioned and released elastically to match demand. Measured service is demonstrated because the company only pays for the resources used during each period, meaning the provider meters resource usage (e.g., CPU hours, memory, bandwidth) and bills accordingly, which is a core attribute of cloud services.

Answer

On-demand self-service

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Resource pooling

Question 14

A company wants to use a cloud service where they can deploy their own custom applications without managing the underlying operating system or hardware. The cloud provider handles the runtime, middleware, and infrastructure. Which cloud service model best fits this requirement?

Accepted Answer

Platform as a Service (PaaS). Platform as a Service (PaaS) is the correct model because it provides a managed environment where the company can deploy custom applications without managing the underlying OS, hardware, runtime, or middleware. The cloud provider handles all infrastructure and platform layers, allowing developers to focus solely on code and application logic.

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Infrastructure as a Service (IaaS)

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Software as a Service (SaaS)

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Desktop as a Service (DaaS)

Question 15

Which cloud characteristic allows an organization to increase or decrease computing resources quickly based on demand, without requiring manual intervention?

Accepted Answer

Rapid elasticity. Rapid elasticity is the cloud characteristic that enables automatic, on-demand scaling of computing resources (such as virtual machines, storage, or network bandwidth) in response to fluctuating workload demands, without requiring manual provisioning or de-provisioning. This is a core feature of cloud computing defined by NIST SP 800-145, allowing resources to scale out (increase) or scale in (decrease) dynamically, often using orchestration tools like Azure Autoscale or AWS Auto Scaling. The key distinction is that the scaling happens quickly and automatically, based on predefined rules or metrics like CPU utilization or request count.

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Measured service

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Resource pooling

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Broad network access