AZ-900 Describe Cloud Concepts Practice Questions

Free AZ-900 Describe Cloud Concepts practice test questions

8 questions from this domain with answers and explanations - different from the samples on the main AZ-900 page. Sign up free to practice the full set.

1. Question 1Describe Cloud Concepts

   A startup wants to launch a new application but does not want to invest in physical servers. They want to pay only for the compute resources they actually consume. Which cloud pricing characteristic does this describe?

   • ACapital expenditure (CapEx) model
   • BReserved capacity model
   • CFixed pricing model
   • DConsumption-based modelCorrect
   ✓ Correct answer: D

   The consumption-based pricing model means you only pay for the cloud resources you actually use, much like a utility bill for electricity. This model eliminates the need for large upfront investments in hardware and allows startups and businesses to align their IT costs directly with actual usage. It is one of the core financial benefits of cloud computing and falls under operational expenditure (OpEx).

   Why the other options are wrong

   • ACapital expenditure (CapEx) model involves large upfront investments in physical infrastructure, which is the opposite of what the startup wants.
   • BReserved capacity model requires committing to a specific amount of resources for a term (typically 1-3 years), not pure pay-per-use.
   • CFixed pricing model implies a set cost regardless of usage, which does not align with paying only for what you consume.
2. Question 2Describe Cloud Concepts

   Cloud computing provides economies of scale because cloud providers can purchase hardware in bulk and pass cost savings to customers.

   • ATrueCorrect
   • BFalse
   ✓ Correct answer: A

   Cloud providers like Microsoft Azure operate at massive scale, purchasing hardware, networking equipment, and datacenter facilities in bulk quantities. These bulk purchasing agreements allow cloud providers to negotiate significantly lower prices than individual organizations could achieve on their own. The cost savings from these economies of scale are then passed on to customers through competitive pricing for cloud services. Economies of scale is one of the fundamental economic benefits of cloud computing and is a core concept tested on the AZ-900 exam. This principle applies across all cloud service models including IaaS, PaaS, and SaaS.

   Why the other options are wrong

   • BFalse is incorrect. The statement is true: Cloud providers like Microsoft Azure operate at massive scale, purchasing hardware, networking equipment, and datacenter facilities in bulk quantities.
3. Question 3Describe Cloud Concepts

   Vertical scaling means adding more instances of a resource, such as additional virtual machines, to handle increased load.

   • ATrue
   • BFalseCorrect
   ✓ Correct answer: B

   Vertical scaling (also known as scaling up) means increasing the capacity of a single resource, such as adding more CPU, memory, or storage to an existing virtual machine. Adding more instances of a resource, such as additional virtual machines, to handle increased load is called horizontal scaling (or scaling out). These are two distinct scaling strategies in cloud computing, and it is important not to confuse them. True is incorrect because the description given matches horizontal scaling (scaling out), not vertical scaling. Vertical scaling involves making an existing resource more powerful rather than adding additional instances.

   Why the other options are wrong

   • ATrue is incorrect. The statement is false: Vertical scaling (also known as scaling up) means increasing the capacity of a single resource, such as adding more CPU, memory, or storage to an existing virtual machine.
4. Question 4Describe Cloud ConceptsSelect all that apply

   Which two are benefits of the consumption-based pricing model in cloud computing? (Choose two.)

   • ANo upfront infrastructure costsCorrect
   • BGuaranteed fixed monthly billing regardless of usage
   • CLower total cost than any on-premises solution
   • DNo charges continue once resources are no longer neededCorrect
   ✓ Correct answer: A, D

   The consumption-based pricing model in cloud computing means you pay only for the resources you actually use. This eliminates the need for large upfront capital expenditure on infrastructure such as servers, storage, and networking equipment. Additionally, when resources are no longer needed, you can deallocate or delete them and immediately stop incurring charges. This pay-as-you-go approach provides financial flexibility and aligns IT spending with actual usage.

   Why the other options are wrong

   • BGuaranteed fixed monthly billing is incorrect because the consumption-based model results in variable costs that fluctuate based on actual resource usage, not fixed monthly amounts.
   • CLower total cost than any on-premises solution is not guaranteed, as costs depend on usage patterns, workload characteristics, and scale; in some scenarios on-premises solutions may be more cost-effective.
5. Question 5Describe Cloud Concepts

   A government agency is evaluating cloud models. The agency's security officer states that all data must be processed on infrastructure exclusively dedicated to their organization and not shared with any other tenants. Which cloud characteristic is the security officer prioritizing?

   • ABroad network access
   • BMulti-tenancy
   • CPay-as-you-go pricing
   • DSingle tenancy in a private cloudCorrect
   ✓ Correct answer: D

   Single tenancy in a private cloud means that the cloud infrastructure is exclusively dedicated to a single organization and is not shared with any other tenants. This meets the government agency's requirement that all data must be processed on infrastructure dedicated solely to their organization. A private cloud can be hosted on-premises or by a third-party provider, but the key characteristic is that the compute, storage, and networking resources are isolated and reserved for one organization only.

   Why the other options are wrong

   • ABroad network access refers to the ability to access cloud services from a wide range of devices and locations over the network, not to infrastructure exclusivity or tenant isolation.
   • BMulti-tenancy is the opposite of what the security officer requires, as it involves multiple organizations sharing the same underlying cloud infrastructure and resources.
   • CPay-as-you-go pricing is a financial model for billing cloud services based on consumption, which is unrelated to the requirement for dedicated, single-tenant infrastructure.
6. Question 6Describe Cloud Concepts

   How does moving to the cloud typically change the way an organization pays for IT?

   • AIt shifts spending from operational expenditure toward capital expenditure
   • BIt removes all IT costs after the initial hardware purchase
   • CIt requires a large upfront investment in owned datacenter equipment
   • DIt shifts spending from capital expenditure toward operational expenditureCorrect
   ✓ Correct answer: D

   Capital expenditure (CapEx) is upfront spending on physical assets such as servers and datacenters, while operational expenditure (OpEx) is ongoing spending on services consumed as needed. Cloud computing follows an OpEx model: instead of buying hardware in advance, organizations pay for the resources they use, which improves cash flow and lets costs scale with actual demand.

   Why the other options are wrong

   • AThis is reversed: the cloud moves spending from CapEx to OpEx, not the other way around.
   • BThe cloud uses ongoing consumption billing; it does not eliminate costs after a purchase.
   • CA large upfront investment in owned equipment is a CapEx, on-premises model, not the cloud.
7. Question 7Describe Cloud Concepts

   Which pricing characteristic of cloud computing means you pay only for the resources you actually use?

   • ACapital expenditure (CapEx)
   • BConsumption-based modelCorrect
   • CFixed-rate pricing
   • DDepreciation-based pricing
   ✓ Correct answer: B

   The consumption-based model is a core pricing characteristic of cloud computing where customers pay only for the resources they actually consume. Instead of investing in and paying for fixed infrastructure regardless of usage, organizations are billed based on metrics like compute hours, storage used, or data transferred. This model eliminates waste from over-provisioning and aligns IT costs directly with actual business usage, making it one of the most compelling financial benefits of cloud computing.

   Why the other options are wrong

   • ACapital expenditure (CapEx) refers to upfront spending on physical infrastructure and is the opposite of pay-per-use, requiring large investments before any resources are consumed.
   • CFixed-rate pricing charges a flat fee regardless of actual usage, which does not align costs with consumption.
   • DDepreciation-based pricing relates to accounting for the declining value of physical assets over time and is associated with on-premises infrastructure, not cloud pay-per-use models.
8. Question 8Describe Cloud Concepts

   Which of the following BEST describes the difference between scalability and elasticity in cloud computing?

   • AScalability is the ability to add resources manually as load grows, while elasticity is only the manual removal of resources whenever load falls back down
   • BScalability is the ability to handle increased load by adding resources, while elasticity is the ability to automatically adjust resources based on current demandCorrect
   • CScalability and elasticity are completely interchangeable terms that describe exactly the same underlying capability under two different names
   • DScalability applies only to storage capacity limits, while elasticity applies only to compute processing power and CPU utilization limits
   ✓ Correct answer: B

   Scalability refers to a system's capacity to grow and handle larger workloads by adding more resources, either vertically (scaling up with more powerful hardware) or horizontally (scaling out with additional instances). Elasticity extends this concept by adding the dimension of automatic, dynamic adjustment. An elastic system not only scales out when demand increases but also scales back in when demand decreases, ensuring that resources match current needs at all times. In Azure, services like Virtual Machine Scale Sets and Azure App Service demonstrate elasticity by automatically adding or removing instances based on metrics like CPU usage or request count.

   Why the other options are wrong

   • AThe defining feature of elasticity is automatic, real-time adjustment; describing it as manual removal of resources conflates it with basic manual scaling.
   • CThe two are related but distinct: scalability is the overall capacity to grow or shrink, while elasticity adds automatic, demand-driven adjustment.
   • DBoth scalability and elasticity apply broadly across compute, storage, and other resources; neither is restricted to a single resource type.

How Describe Cloud Concepts is tested

This domain holds 292 of the 972 questions in the AZ-900 bank, about 30%. The mix is 185 single-answer multiple choice, 44 true/false, 30 multiple-response, 15 yes/no scenario, 12 hotspot and 6 ordering, so it is worth practising the formats as well as the content.

Once you have a few attempts recorded, CertGrid scores every domain separately and points you at the weakest one, so you can drill Describe Cloud Concepts on its own rather than re-running full-length mocks.

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