AZ-900 - Azure Fundamentals (Module 2)

What provides high availability if an Azure datacenter has problems?

• Availability zones

• Region pairs

• Fault domains

Answer explanation

Availability zones provide redundancy within an Azure region by isolating infrastructure across multiple isolated data centers. This ensures high availability if one zone has problems.

What are Azure regions organized into for governments and countries?

• Geographic hierarchies

• Availability zones

• Sovereign clouds

Answer explanation

Azure uses sovereign clouds to meet specific country/government requirements by providing dedicated regions with regulatory compliance.

What is required for an Azure region to be considered enabled?

• At least 3 zones

• An ExpressRoute circuit

• 1 zone

Answer explanation

For resilient redundancy, an Azure region must have at least 3 separate zones. Fewer zones lack redundancy.

What is an Azure datacenter?

• A collection of servers

• A physical facility with power, cooling and network

• A resource group

Answer explanation

An Azure datacenter is a physical facility containing all the power, cooling, networking needed to operate servers. It is not just servers or a resource group.

What entity is used to give access to create Azure resources?

• Virtual network

• Subscription

• Resource group

Answer explanation

An Azure subscription provides access permissions to create and manage Azure resources for a user/account.

What can management groups contain?

• Resources

• Subscriptions and other management groups

• Resource groups

Answer explanation

Management groups can only contain subscriptions and other management groups, not individual resources.

Which service offers serverless container hosting?

• AKS (Azure Kubernetes Service)

• ACI (Azure Container Instances)

• App Service

Answer explanation

Azure Container Instances (ACI) delivers serverless Docker container hosting without managing servers.

Azure Kubernetes Service (AKS) offers the quickest way to start developing and deploying cloud-native apps in Azure, datacenters, or at the edge with built-in code-to-cloud pipelines and guardrails.

Azure App Service is an HTTP-based service for hosting web applications, REST APIs, and mobile back ends.

What does Azure Functions allow creation of?

• Containers

• Serverless apps

• Kubernetes clusters

Answer explanation

Azure Functions provides serverless computing by abstracting away servers to just run event-triggered code snippets.

What provides fault tolerance for Azure VMs?

• Availability zones

• Availability sets

• Scale sets

Answer explanation

Availability sets group VMs to ensure at least one is available during maintenance/failures, providing fault tolerance.

What enables easy scaling of Azure VMs?

• Auto-scaling

• Availability sets

• Virtual machine scale sets

Answer explanation

Virtual Machine Scale Sets (VMSS) in Microsoft Azure enable easy scaling of Azure VMs. VMSS allows you to deploy and manage a set of identical VMs as a group. This feature automatically scales the number of VM instances up or down based on demand or defined criteria, making it an efficient choice for handling variable workloads.

Auto-scaling is a general term used to describe the capability of automatically adjusting resources based on predefined conditions or metrics. While auto-scaling is a feature that VMSS utilizes, it is not the specific feature in Azure that directly enables easy scaling of VMs.

Availability sets are used to ensure high availability of applications by distributing VMs across multiple physical hardware nodes to avoid a single point of failure. While they contribute to enhancing the availability and reliability of VMs, they don't directly handle the scaling of VMs based on demand or predefined criteria.