Azure Fundamentals (AZ-900) — All Questions

Which cloud service model gives you the most control over the operating system, networking, and installed software, while the provider manages only the physical hardware?

• a.Function as a Service (FaaS)
• b.Software as a Service (SaaS)
• c.Infrastructure as a Service (IaaS)✓
• d.Platform as a Service (PaaS)

IaaS provides virtualized compute, storage, and networking, leaving the customer responsible for the operating system and everything above it. The provider only manages the underlying physical infrastructure. This gives the greatest flexibility but also the most administrative overhead.

In which cloud service model does the provider deliver a complete, ready-to-use application over the internet, such as a hosted email or CRM product?

• a.Infrastructure as a Service (IaaS)
• b.Platform as a Service (PaaS)
• c.Software as a Service (SaaS)✓
• d.Desktop as a Service (DaaS)

SaaS delivers finished software that users simply consume, usually through a web browser. The provider manages everything from the hardware up to the application itself. Customers only configure settings and manage their own data and users.

A development team wants to deploy code without managing the underlying servers, operating system patches, or runtime. Which model best fits this need?

• a.Infrastructure as a Service (IaaS)
• b.Colocation hosting
• c.Platform as a Service (PaaS)✓
• d.Software as a Service (SaaS)

PaaS provides a managed platform including the operating system, runtime, and middleware, so developers focus only on their application code and data. The provider handles patching and infrastructure maintenance. This accelerates development while reducing operational burden.

What is the primary financial benefit of the cloud's consumption-based (pay-as-you-go) pricing model?

• a.Hardware must be purchased upfront for the year
• b.You pay only for the resources you actually use, converting capital expense into operating expense✓
• c.You receive a fixed monthly bill regardless of usage
• d.Costs are hidden until an annual audit

Consumption-based pricing charges you only for the compute, storage, and services you consume. This shifts spending from large upfront capital expenditure (CapEx) to flexible operating expenditure (OpEx). It lets organizations avoid over-provisioning and align cost with demand.

Which cloud benefit describes the ability to quickly add or remove resources to match changing demand?

• a.Scalability and elasticity✓
• b.High latency
• c.Manual provisioning
• d.Vendor lock-in

Scalability lets you increase capacity as workloads grow, while elasticity automatically adds or removes resources in response to demand. Together they ensure applications perform well during spikes and save money during quiet periods. This responsiveness is a core advantage of cloud computing.

What does the term 'high availability' primarily refer to in cloud computing?

• a.Keeping applications running and accessible with minimal downtime✓
• b.Encrypting data at rest
• c.Reducing the number of servers to save money
• d.Storing data in a single location

High availability means designing systems so they remain operational even when individual components fail. Cloud platforms achieve this through redundancy, load balancing, and distribution across fault domains. The goal is to minimize service interruptions and meet uptime commitments.

In the shared responsibility model, which task is ALWAYS the customer's responsibility regardless of the service model used?

• a.Maintaining the physical datacenter security
• b.Securing the physical network cabling
• c.Replacing failed physical hard drives
• d.Managing the data, accounts, and access identities✓

The customer always retains responsibility for their own data, user accounts, and identity/access management no matter which service model is chosen. The provider is always responsible for the physical datacenter and hardware. Responsibilities in between shift depending on IaaS, PaaS, or SaaS.

Under the shared responsibility model for IaaS, who is responsible for patching the guest operating system on a virtual machine?

• a.No patching is required in the cloud
• b.The customer✓
• c.The hardware vendor
• d.The cloud provider

With IaaS, the customer manages the virtual machine's operating system, including applying security patches and updates. The provider only maintains the physical host and hypervisor. This division is central to understanding cloud security obligations.

Which type of cloud deployment combines on-premises infrastructure with public cloud resources, allowing data and applications to move between them?

• a.Private cloud only
• b.Community cloud
• c.Hybrid cloud✓
• d.Public cloud only

A hybrid cloud connects private, on-premises environments with public cloud services so workloads can span both. This lets organizations keep sensitive systems local while bursting to the public cloud for scale. It is popular for gradual migration and regulatory needs.

What is a defining characteristic of a public cloud deployment?

• a.Hardware is dedicated exclusively to one organization on-premises
• b.Resources are owned and operated by a third-party provider and shared among multiple organizations✓
• c.It cannot connect to the internet
• d.It requires the customer to own the datacenter

In a public cloud, a third-party provider owns the infrastructure and offers services to many customers over the internet. Resources are multi-tenant and delivered on demand. This model offers low upfront cost and virtually unlimited scale.

Which deployment model dedicates cloud infrastructure to a single organization, often for stricter control or compliance?

• a.Private cloud✓
• b.Public cloud
• c.Hybrid cloud
• d.Multi-tenant SaaS

A private cloud provides computing resources used exclusively by one organization, whether hosted on-premises or by a provider. It offers greater control and isolation, which helps meet strict security or regulatory requirements. The trade-off is typically higher cost and management effort.

What is meant by 'agility' as a benefit of cloud computing?

• a.The requirement to sign multi-year hardware contracts
• b.The ability to rapidly develop, test, and deploy applications✓
• c.The guarantee of zero cost
• d.The elimination of all security concerns

Agility refers to how quickly you can provision resources and bring solutions to market in the cloud. Instead of waiting weeks to procure hardware, teams spin up environments in minutes. This speed accelerates innovation and experimentation.

Which concept describes distributing resources across multiple physical datacenters so a single failure does not take down a service?

• a.Data sovereignty
• b.Consumption-based billing
• c.Fault tolerance and redundancy✓
• d.Vertical scaling

Fault tolerance uses redundant components and locations so the failure of one does not disrupt the overall service. Cloud providers replicate resources across isolated fault domains. This design keeps applications available during hardware or facility failures.

What distinguishes 'vertical scaling' from 'horizontal scaling'?

• a.They are identical terms
• b.Vertical scaling adds more instances, while horizontal scaling adds CPU/RAM
• c.Vertical scaling adds power (CPU/RAM) to an existing resource, while horizontal scaling adds more instances✓
• d.Vertical scaling only applies to storage

Vertical scaling (scaling up) increases the capacity of a single machine by adding CPU, memory, or disk. Horizontal scaling (scaling out) adds more machines or instances to share the load. Cloud platforms support both, but scaling out is often more resilient.

Which of the following is an example of an operating expense (OpEx) enabled by the cloud?

• a.A one-time purchase of physical servers
• b.Buying a datacenter building
• c.A monthly bill for the compute hours consumed✓
• d.Purchasing networking hardware upfront

OpEx refers to ongoing, usage-based spending such as a monthly cloud bill for consumed services. This contrasts with CapEx, which is a large upfront purchase of assets. The cloud's pay-as-you-go model favors OpEx, improving cash flow and flexibility.

What does 'disaster recovery' in the cloud primarily help an organization achieve?

• a.Restoring systems and data quickly after a major outage or failure✓
• b.Eliminating the need for backups
• c.Reducing the monthly subscription cost
• d.Increasing application latency

Disaster recovery is the practice of restoring IT systems and data after a significant disruptive event. Cloud services make this easier and more affordable by replicating data to other regions. This minimizes downtime and data loss during major incidents.

Which cloud characteristic allows many customers to share the same physical infrastructure while remaining logically isolated?

• a.Single-tenancy
• b.Multi-tenancy✓
• c.Colocation
• d.On-premises hosting

Multi-tenancy means multiple customers (tenants) share the same underlying physical resources while their data and workloads stay logically separated. This efficient use of hardware lowers costs for everyone. Providers enforce strong isolation to keep tenants secure from one another.

A company wants to avoid the cost and effort of maintaining physical servers. Which cloud advantage most directly addresses this?

• a.Longer procurement times
• b.Increased hardware ownership
• c.Reduced infrastructure management responsibility✓
• d.Higher capital expenditure

By moving to the cloud, organizations offload the purchase, maintenance, and refresh of physical hardware to the provider. This reduces the management burden and staffing needed for datacenters. Teams can then focus on applications and business value instead of infrastructure.

What is the main purpose of a service-level agreement (SLA) offered by a cloud provider?

• a.It lists the provider's employees
• b.It formally defines the expected performance and uptime guarantees for a service✓
• c.It encrypts customer data automatically
• d.It sets the price of physical hardware

An SLA is a formal commitment that specifies metrics such as guaranteed uptime and availability for a service. If the provider fails to meet these targets, customers may receive service credits. SLAs help organizations plan for reliability and set expectations.

Which of the following best describes 'elasticity' in cloud computing?

• a.Applications must be manually restarted daily
• b.Resources remain fixed regardless of load
• c.Storage is limited to a single disk
• d.Resources automatically expand or contract to match real-time demand✓

Elasticity is the automatic scaling of resources up or down in response to workload changes. During a traffic spike, more capacity is added; when demand falls, capacity is released. This keeps performance steady while avoiding payment for idle resources.

In the shared responsibility model for SaaS, which responsibility shifts almost entirely to the provider?

• a.Managing the application, runtime, and operating system✓
• b.Setting data-sharing permissions
• c.Choosing which users get accounts
• d.Managing user access and data classification

In SaaS, the provider manages nearly the entire stack including the application, runtime, and operating system. The customer's remaining duties center on their data, users, and access configuration. This makes SaaS the lowest-maintenance model for consumers.

Why is 'geographic distribution' of datacenters valuable to cloud customers?

• a.It increases the physical distance data must travel
• b.It forces all data into one country
• c.It lets applications serve users from nearby locations, reducing latency and improving resilience✓
• d.It removes the need for redundancy

Providers operate datacenters around the world so applications can run close to their users. This lowers latency and improves the user experience. Geographic spread also supports disaster recovery and compliance with data-residency requirements.

Which statement about capital expenditure (CapEx) is correct?

• a.It is a recurring monthly usage charge
• b.It only applies to cloud subscriptions
• c.It is a large upfront investment in physical assets like servers and datacenters✓
• d.It eliminates the need to own hardware

CapEx is spending on tangible assets, such as buying servers or building a datacenter, that are used over many years. Traditional on-premises IT relies heavily on CapEx. Cloud computing reduces CapEx by shifting toward pay-as-you-go OpEx.

What is a key reason organizations adopt cloud computing for 'reliability'?

• a.Built-in redundancy and backups keep services running and recoverable during failures✓
• b.It makes applications run offline permanently
• c.It guarantees the code has no bugs
• d.It removes the need for testing

Reliability in the cloud comes from redundant infrastructure, automated backups, and the ability to recover quickly from failures. Providers design their platforms to keep services available and data protected. This lets organizations meet uptime and continuity goals more easily.

A workload experiences predictable spikes every weekday morning. Which cloud capability lets it automatically add capacity during those spikes and remove it afterward?

• a.Data archiving
• b.Static provisioning
• c.Autoscaling✓
• d.Manual server purchasing

Autoscaling monitors demand and adjusts the number of running resources automatically. During predictable morning spikes it adds instances, then removes them when traffic subsides. This maintains performance while controlling cost, a hallmark of elastic cloud design.

Which of the following is generally NOT considered a benefit of moving to the public cloud?

• a.Full ownership and physical control of the underlying hardware✓
• b.Reduced upfront capital costs
• c.Scalability on demand
• d.Global reach and availability

Public cloud customers do not own or physically control the hardware; that stays with the provider. The recognized benefits include on-demand scalability, lower upfront costs, and global reach. Trading physical control for these advantages is the essence of the public cloud model.

Which statement best defines a consumption-based (pay-as-you-go) pricing model?

• a.You must estimate and pay for peak capacity even when it sits completely idle
• b.You pay only for the resources you use, with no upfront commitment✓
• c.A fixed yearly fee is paid in advance regardless of how much you actually use
• d.Billing is based on the number of employees in the organization

Consumption-based pricing charges you only for the compute, storage, and services you actually consume. There is no large upfront commitment, so spending tracks real usage. This lets organizations avoid paying for idle, over-provisioned capacity.

Which spending shift best characterizes moving from an on-premises datacenter to a pay-as-you-go cloud model?

• a.From variable usage-based costs to fixed hardware purchases
• b.From subscription billing to one-time perpetual software licenses
• c.From capital expenditure (CapEx) to operating expenditure (OpEx)✓
• d.From operating expenditure (OpEx) to capital expenditure (CapEx)

On-premises IT relies on CapEx: large upfront purchases of servers and facilities. The cloud shifts spending to OpEx, an ongoing usage-based cost. This improves cash flow and removes the need to buy assets years ahead of demand.

Which of the following is the clearest example of Software as a Service (SaaS)?

• a.A managed database platform where you still deploy your own schema and application code
• b.A bare-metal server hosted in a colocation facility that you fully manage
• c.A ready-to-use, web-based email service accessed through a browser✓
• d.Renting a virtual machine on which you install and maintain your own applications yourself

SaaS delivers a finished application that users simply consume, usually through a browser. The provider manages everything from hardware up to the application. Hosted email or CRM products are classic SaaS examples.

A company wants full control of the operating system and installed software but does not want to buy or maintain physical servers. Which model fits?

• a.Platform as a Service (PaaS)
• b.Infrastructure as a Service (IaaS)✓
• c.Software as a Service (SaaS)
• d.A fully managed, ready-to-use application delivered over the internet

IaaS provides virtualized compute, storage, and networking while the provider maintains the physical hardware. The customer controls the OS and everything above it. This offers maximum flexibility without owning servers.

In the cloud shared responsibility model, which item is ALWAYS the provider's responsibility across every service model?

• a.The configuration of user access permissions
• b.The classification and protection of the customer's data
• c.The management of user accounts and identities
• d.The physical security of the datacenters and hardware✓

No matter the service model, the provider always secures the physical datacenter and hardware. Data, identities, and access remain the customer's responsibility. Layers in between shift depending on IaaS, PaaS, or SaaS.

How does consumption-based pricing help organizations avoid wasted spending?

• a.You pay only for what you use, avoiding over-provisioning for peak demand✓
• b.It charges a flat fee that never changes regardless of how much you use
• c.It bills based on the number of datacenters the provider operates worldwide
• d.It requires you to buy three years of capacity in advance for every workload

Because you pay only for what you consume, you no longer buy hardware sized for peak load that sits idle most of the time. Costs scale up and down with demand. This eliminates the waste of traditional over-provisioning.

Which statement is TRUE of the public cloud deployment model?

• a.It can only be used by a single organization inside its own building
• b.A third-party provider owns the infrastructure and offers it to many customers✓
• c.The customer owns, maintains, and refreshes all of the underlying physical hardware
• d.It cannot scale beyond a small fixed amount of capacity

In a public cloud, a third-party provider owns and operates the infrastructure and offers it to many tenants over the internet. Resources are shared and delivered on demand. This gives low upfront cost and vast scale.

An organization needs computing resources used exclusively by itself for compliance reasons, hosted either on-premises or by a provider. Which model is this?

• a.Community cloud shared by several agencies
• b.Private cloud✓
• c.Multi-tenant SaaS
• d.Public cloud

A private cloud dedicates infrastructure to a single organization, whether hosted internally or by a provider. This isolation supports strict security and compliance needs. The trade-off is usually higher cost and management effort.

What is a key advantage of a hybrid cloud approach?

• a.It forces all data to remain permanently in a single datacenter
• b.It eliminates the ability to use any public cloud services
• c.It lets sensitive workloads stay on-premises while bursting to the public cloud for scale✓
• d.It completely removes the need for any form of internet connectivity between sites

Hybrid cloud links private, on-premises environments with public cloud services. Sensitive systems can stay local while workloads burst to the cloud for extra capacity. It suits gradual migration and regulatory requirements.

Which description best matches elasticity rather than plain scalability?

• a.Storage is limited to one physical disk per server
• b.Resources automatically grow and shrink in near real time as demand changes✓
• c.An administrator manually places an order for additional servers whenever demand rises
• d.Capacity is fixed at deployment and never changes afterward

Elasticity is the automatic, demand-driven expansion and contraction of resources. Scalability is the broader ability to grow capacity, which can be manual. Elasticity specifically implies near real-time, hands-off adjustment.

Which design choice most directly increases the high availability of an application?

• a.Running the application on a single server with no backups at all
• b.Storing every copy of the data on one disk in one datacenter
• c.Deploying redundant instances across multiple fault domains✓
• d.Disabling monitoring and health checks to reduce operating cost

High availability comes from redundancy so that no single failure takes the service down. Spreading instances across fault domains keeps the app running during hardware faults. Monitoring and backups support, but do not by themselves create, availability.

A startup can launch a new test environment in minutes instead of waiting weeks for hardware. Which cloud benefit does this illustrate?

• a.Multi-tenancy
• b.Agility✓
• c.Data sovereignty
• d.Vendor lock-in

Agility is the ability to provision resources and deliver solutions quickly. Instead of long hardware procurement, environments spin up in minutes. This speeds experimentation and time to market.

Which practice best supports disaster recovery for a cloud-hosted application?

• a.Turning off all backups permanently to reduce monthly cost
• b.Replicating data and workloads to a geographically separate region✓
• c.Relying on users to email themselves copies of important files
• d.Keeping only one single copy of all production data in one primary region

Disaster recovery restores systems and data after a major outage. Replicating to a separate region protects against a whole-region failure such as a natural disaster. This minimizes downtime and data loss.

Which of the following is an example of a capital expenditure (CapEx)?

• a.A one-time purchase of physical servers for a datacenter✓
• b.A per-second charge for a running container instance
• c.A usage-based fee for outbound data transfer
• d.A recurring monthly invoice for the cloud compute hours actually consumed

CapEx is an upfront purchase of long-lived assets such as servers or datacenter equipment. It is depreciated over years. The cloud reduces CapEx by replacing it with usage-based OpEx.

Which characteristic describes operating expenditure (OpEx) in a cloud context?

• a.Ongoing, usage-based costs that scale with consumption✓
• b.A large upfront purchase of hardware assets
• c.A fixed asset that is depreciated over several years
• d.A one-time perpetual software license bought outright

OpEx is ongoing spending that rises and falls with usage, like a monthly cloud bill. It contrasts with CapEx, a big upfront asset purchase. The pay-as-you-go cloud model favors OpEx.

Under PaaS, which responsibility typically remains with the customer?

• a.Managing their application code and data✓
• b.Maintaining the physical network hardware in the datacenter
• c.Patching the underlying host operating system
• d.Replacing failed physical disks in the datacenter

With PaaS the provider manages the OS, runtime, and infrastructure. The customer focuses on their application code and data. This reduces operational overhead while keeping control of the app.

Adding more identical web server instances behind a load balancer to handle more users is an example of what?

• a.Archiving cold data to lower tiers
• b.Horizontal scaling (scaling out)✓
• c.Reducing redundancy across the system
• d.Vertical scaling (scaling up)

Horizontal scaling, or scaling out, adds more instances to share the load. Vertical scaling instead adds CPU or memory to a single machine. Scaling out is often more resilient and elastic.

How does fault tolerance differ from disaster recovery?

• a.Disaster recovery prevents any failure from ever happening at all
• b.Fault tolerance only applies to monthly billing calculations
• c.Fault tolerance keeps a system running through component failures; disaster recovery restores it after a major outage✓
• d.They are exactly the same concept and are fully interchangeable in every single situation

Fault tolerance uses redundancy so individual component failures do not stop the service. Disaster recovery is about restoring service and data after a large disruptive event. They are complementary reliability strategies.

If a cloud service offers a higher composite SLA, what does that generally indicate?

• a.It consumes less electricity in the datacenter
• b.It offers a stronger guarantee of uptime and availability✓
• c.It costs nothing at all to run each month
• d.It is far more likely to contain unpatched security vulnerabilities over time

An SLA is the provider's formal commitment to a level of uptime and availability. A higher SLA means a stronger guarantee and less allowed downtime. Failing to meet it can entitle customers to service credits.

Why does multi-tenancy help lower costs in the public cloud?

• a.Because it removes the need for any security controls whatsoever
• b.Because each and every customer is given fully dedicated physical hardware of their own
• c.Because it stores all data on the customer's own premises
• d.Because many customers share the same underlying infrastructure efficiently✓

Multi-tenancy lets many customers share pooled physical resources while staying logically isolated. This high utilization spreads cost across tenants. Providers enforce strong isolation to keep tenants secure from one another.

Cloud providers can often offer lower per-unit prices than a single company running its own datacenter. Why?

• a.Because they never invest in any new hardware at all
• b.Economies of scale from operating massive, shared datacenters✓
• c.Because customers must pay for all unused capacity upfront
• d.Because they avoid every electricity and cooling cost entirely

Providers operate at enormous scale, buying and running hardware far more efficiently than a single firm. These economies of scale lower the per-unit cost. Savings are passed on through competitive pricing.

A team wants to build and deploy a web app while letting the provider handle OS patching, runtime, and scaling. Which model should they choose?

• a.Infrastructure as a Service (IaaS)
• b.On-premises bare metal
• c.Colocation hosting
• d.Platform as a Service (PaaS)✓

PaaS provides a managed platform including OS, runtime, and scaling. Developers deploy code without managing servers. This accelerates delivery and cuts operational work.

With a SaaS product, what does the customer still control?

• a.The physical servers running the service
• b.The operating system patching schedule and the maintenance windows for the servers
• c.The application's underlying source code
• d.Their own data and which users have accounts✓

In SaaS the provider manages almost the entire stack. The customer's remaining responsibilities center on their data, users, and access settings. This makes SaaS the lowest-maintenance model for consumers.

Which billing behavior is characteristic of many serverless and consumption-based cloud services?

• a.A single flat annual license fee that applies regardless of how much you actually use
• b.Charges that accrue per execution or per second of actual use✓
• c.Charges that occur only when you buy new physical hardware
• d.A single fixed fee for truly unlimited usage forever

Serverless and consumption services bill on granular actual usage, such as per execution or per second. There is no charge when nothing runs. This tightly aligns cost with real demand.