Microsoft Azure Fundamentals - AZ-900

About the AZ-900 certification

Exam code

AZ-900

Official exam guideDomain weightings come from the vendor and change over time. Check the official guide before you book.

1. 1.A company wants to stop buying servers upfront and instead pay only for the computing resources it actually consumes each month. Which cloud benefit does this describe?

   • AMoving from capital expenditure to operational expenditureCorrect answer
   • BHigh availability
   • CElasticity
   • DGovernance

   Why

   Moving from capital expenditure (CapEx) to operational expenditure (OpEx) means replacing large upfront hardware purchases with ongoing charges based on actual consumption. High availability describes keeping a service running. Elasticity describes adjusting capacity to demand. Governance describes controlling how resources are used.

2. 2.An application automatically adds instances when demand rises and removes them when demand falls. Which cloud characteristic does this describe?

   • AElasticityCorrect answer
   • BScalability
   • CHigh availability
   • DDisaster recovery

   Why

   Elasticity is the ability to add and remove resources automatically so capacity matches demand at any moment. Scalability is the ability to grow to handle more load. High availability is keeping the service running during failures. Disaster recovery is restoring service after a major outage.

3. 3.Which cloud service model gives the customer the MOST control over the operating system, while the provider manages the physical hardware?

   • AInfrastructure as a service (IaaS)Correct answer
   • BPlatform as a service (PaaS)
   • CSoftware as a service (SaaS)
   • DServerless

   Why

   Infrastructure as a service (IaaS) provides virtualized compute, storage, and networking, leaving the customer responsible for the operating system, middleware, and applications. In PaaS the provider also manages the operating system. In SaaS the provider manages the entire application. Serverless abstracts the infrastructure entirely.

4. 4.A company subscribes to Microsoft 365 and uses Outlook, Word, and Teams without installing or maintaining any servers. Which cloud service model is this?

   • ASoftware as a service (SaaS)Correct answer
   • BInfrastructure as a service (IaaS)
   • CPlatform as a service (PaaS)
   • DServerless

   Why

   Software as a service (SaaS) delivers a complete, ready-to-use application managed entirely by the provider, which is what Microsoft 365 is. IaaS provides virtual machines the customer manages. PaaS provides a platform on which the customer deploys its own application code. Serverless is a compute model within PaaS.

5. 5.An organization runs some workloads in its own datacenter and connects them to workloads running in Azure. Which cloud deployment model is this?

   • AHybrid cloudCorrect answer
   • BPublic cloud
   • CPrivate cloud
   • DMulti-cloud

   Why

   A hybrid cloud combines on-premises infrastructure with public cloud resources, connected so workloads can span both. A public cloud uses only the provider's shared infrastructure. A private cloud is operated for a single organization. Multi-cloud means using more than one public cloud provider.

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