How to Ace the AZ-900: Azure Fundamentals

Question 1 · Describe cloud concepts

Your organization currently maintains on-premises servers for internal applications. You want to migrate to a cloud solution that provides the most control over infrastructure while leveraging cloud benefits. Which cloud model should you choose?

• Public cloud
• Private cloud
• Hybrid cloud
• Community cloud

Correct answer: Private cloud

A private cloud provides maximum control over infrastructure while still offering cloud benefits like scalability and on-demand resources. Public cloud shares resources among multiple tenants with less control, while hybrid cloud combines both but isn't the only option for maximum control. Private clouds are ideal for organizations needing dedicated infrastructure.

Question 2 · Describe Azure architecture and services

Your organization is deploying a mission-critical application and needs protection against both datacenter-level failures and regional outages. Which provides the highest redundancy?

• Deploying VMs in a single availability zone
• Deploying VMs across multiple availability zones with backup in a paired region
• Deploying VMs in an availability set within a single datacenter
• Deploying VMs in multiple regions without availability zones

Correct answer: Deploying VMs across multiple availability zones with backup in a paired region

Multi-zone deployment within a region protects against datacenter failures, and paired regions provide protection against regional outages.

Question 3 · Describe Azure management and governance

Which of the following is a factor that can affect costs in Azure?

• The region where resources are deployed
• The operating system used locally on your computer
• The color of your office furniture
• The number of employees in your company

Correct answer: The region where resources are deployed

The Azure region where you deploy resources directly impacts costs, as pricing varies by geographic location due to infrastructure and operational costs in different regions.

Question 4 · Describe cloud concepts

A startup company wants to launch a new web application but wants to minimize upfront infrastructure costs and only pay for resources actually used. Which cloud concept best addresses this requirement?

• Fixed pricing model
• Consumption-based pricing model
• Reserved capacity pricing
• Dedicated host pricing

Correct answer: Consumption-based pricing model

The consumption-based model charges only for resources used, with no upfront costs or long-term commitments. This is ideal for startups with variable workloads. Fixed pricing requires upfront commitment, reserved capacity requires advance commitment, and dedicated host pricing locks in capacity regardless of usage.

Question 5 · Describe cloud concepts

Your company operates critical financial systems that must comply with strict data sovereignty laws requiring data to remain within specific geographic boundaries. Which cloud deployment model is most appropriate?

• Public cloud with geo-redundancy
• Private cloud within specific regions
• Hybrid cloud with on-premises data storage
• Public cloud multi-region deployment

Correct answer: Private cloud within specific regions

A private cloud gives your organization direct control over data location and can be deployed within specific geographic boundaries to meet data sovereignty requirements. While hybrid clouds can also address this, private cloud provides the most direct control. Public cloud deployments, even with geo-redundancy, involve shared infrastructure and potential data movement.

Question 6 · Describe cloud concepts

What is the primary characteristic that distinguishes cloud computing from traditional on-premises infrastructure?

• Cloud computing requires physical data center access
• Cloud computing provides on-demand access to computing resources over the internet with pay-as-you-go pricing
• Cloud computing eliminates the need for any user management
• Cloud computing guarantees 100% uptime

Correct answer: Cloud computing provides on-demand access to computing resources over the internet with pay-as-you-go pricing

Cloud computing's defining characteristic is the ability to access computing resources on-demand via the internet with consumption-based pricing. On-premises infrastructure typically requires upfront capital investment and fixed costs. The other options misrepresent cloud characteristics.

Question 7 · Describe cloud concepts

Your organization manages customer relationship management (CRM) systems that experience significant traffic fluctuations throughout the year. Which cloud model would provide the best cost efficiency for this workload?

• Private cloud with fixed server capacity
• Public cloud with auto-scaling capabilities
• Hybrid cloud with minimal cloud integration
• Dedicated on-premises servers

Correct answer: Public cloud with auto-scaling capabilities

A public cloud with auto-scaling automatically adjusts resources based on demand, paying only for what's used. This is cost-efficient for workloads with fluctuating traffic. Private cloud with fixed capacity would waste resources during low-traffic periods, while dedicated on-premises servers have fixed costs regardless of usage patterns.

Question 8 · Describe cloud concepts

Under the shared responsibility model in cloud computing, who is responsible for patching the operating system of the host machine in a Platform-as-a-Service (PaaS) offering?

• The customer organization
• The cloud service provider
• Both the customer and provider equally
• A third-party security vendor

Correct answer: The cloud service provider

In PaaS, the cloud provider manages the underlying infrastructure including operating systems, while customers are responsible for applications, data, and runtime environments. The provider's responsibility increases with PaaS compared to IaaS, where customers would manage OS patching themselves.

Question 9 · Describe cloud concepts

A company needs to run legacy applications that require specialized hardware not available in public cloud offerings. They also use modern cloud services for new applications. Which cloud approach would be best suited?

• Migrate entirely to a public cloud provider
• Keep all systems on-premises
• Implement a hybrid cloud solution
• Use only a private cloud deployment

Correct answer: Implement a hybrid cloud solution

A hybrid cloud solution allows organizations to maintain on-premises infrastructure for legacy applications requiring specialized hardware while leveraging public cloud for modern applications. This balances control and cost efficiency. Pure public cloud wouldn't support the legacy requirements, on-premises doesn't provide cloud benefits, and private cloud may not be cost-effective for newer applications.

Question 10 · Describe cloud concepts

In Infrastructure-as-a-Service (IaaS), which component is the customer responsible for managing?

• Physical servers and network hardware
• Operating system patching and application management
• Data center cooling and power distribution
• Network infrastructure and cables

Correct answer: Operating system patching and application management

In IaaS, customers have virtual machines and must manage the operating systems, applications, and data. The cloud provider manages physical infrastructure, servers, networking hardware, and data center operations. This represents the highest level of customer responsibility among the major cloud service models.