AZ-104 Deploy and Manage Azure Compute Practice Test 3 — 15 Questions

Question 1

You need to deploy 25 identical Azure virtual machines for a web application and scale the number of instances automatically based on CPU demand. Which Azure compute feature should you use?

Accepted Answer

A Virtual Machine Scale Set. A Virtual Machine Scale Set (VMSS) is the correct Azure compute feature because it allows you to deploy and manage a group of identical, load-balanced VMs whose number can automatically increase or decrease in response to CPU demand using autoscale rules. This directly meets the requirement for 25 identical VMs with automatic scaling based on CPU metrics.

Answer

An availability set

Answer

A Recovery Services vault

Answer

Boot diagnostics

Question 2

You need to run a script inside an Azure virtual machine after deployment to install application prerequisites. Which feature should you use?

Accepted Answer

A Custom Script Extension. The Custom Script Extension (CSE) is the correct feature because it allows you to run a script inside an Azure VM after deployment, making it ideal for installing application prerequisites. CSE downloads and executes scripts on the VM, supporting both Windows (via PowerShell) and Linux (via Bash) environments, and can be applied during initial provisioning or to an existing VM.

Answer

Azure Policy

Answer

Boot diagnostics

Answer

A proximity placement group

Question 3

You need to deploy a set of identical Azure virtual machines that can automatically scale out during demand spikes and scale in when usage falls. Which Azure feature should you use?

Accepted Answer

A Virtual Machine Scale Set. A Virtual Machine Scale Set (VMSS) is the correct Azure feature because it is designed specifically to deploy and manage a set of identical, load-balanced VMs that can automatically scale out (increase instance count) during demand spikes and scale in (decrease instance count) when usage falls, using autoscale rules based on metrics like CPU or memory.

Answer

An availability set

Answer

A Recovery Services vault

Answer

Boot diagnostics

Question 4

You need to deploy 30 identical Azure virtual machines for a web application and scale the instance count automatically based on CPU demand. Which Azure compute feature should you use?

Accepted Answer

A Virtual Machine Scale Set. Virtual Machine Scale Sets (VMSS) are designed specifically to deploy and manage a group of identical, load-balanced VMs that can automatically scale in or out based on CPU demand or other metrics. This matches the requirement for 30 identical VMs and autoscaling, making B the correct choice.

Answer

An availability set

Answer

A Recovery Services vault

Answer

Boot diagnostics

Question 5

You need to ensure that a virtual machine is protected by Azure Backup and can be restored from centralized backup data if the VM is deleted. Which Azure resource should you configure first?

Accepted Answer

A Recovery Services vault. A Recovery Services vault is the foundational Azure resource for Azure Backup. It stores backup data and recovery points, enabling centralized backup management and restoration even if the original VM is deleted. Without first configuring a Recovery Services vault, you cannot define backup policies or initiate backups for the VM.

Answer

An availability set

Answer

A network security group

Answer

A public IP address

Question 6

You need to deploy a group of identical Azure virtual machines and ensure they are distributed across fault domains and update domains to reduce the impact of host failures and planned maintenance. Which feature should you use?

Accepted Answer

An availability set. An availability set is the correct feature because it logically groups VMs to isolate them from each other during host failures and planned maintenance. It distributes VMs across up to 3 fault domains (each with separate power, cooling, and network) and up to 20 update domains (which are rebooted sequentially during maintenance), ensuring that not all VMs are impacted simultaneously.

Answer

A proximity placement group

Answer

A private endpoint

Answer

A custom script extension

Question 7

You need to run a PowerShell script inside a newly deployed Azure virtual machine to configure application settings immediately after deployment. Which feature should you use?

Accepted Answer

A Custom Script Extension. The Custom Script Extension (CSE) is the correct choice because it allows you to run a PowerShell script on an Azure VM after deployment, making it ideal for configuring application settings. CSE downloads and executes scripts on the VM using the Azure VM agent, and it can be invoked during VM creation or post-deployment via ARM templates, Azure CLI, or PowerShell.

Answer

Azure Policy

Answer

Boot diagnostics

Answer

An availability set

Question 8

You need to deploy 20 identical Azure virtual machines for a web application and automatically scale the number of instances based on CPU demand. Which Azure feature should you use?

Accepted Answer

A Virtual Machine Scale Set. A Virtual Machine Scale Set (VMSS) is the correct Azure feature because it allows you to deploy and manage a group of identical, load-balanced VMs that can automatically scale in or out based on CPU demand using autoscale rules. This directly meets the requirement for deploying 20 identical VMs with automatic scaling based on a performance metric like CPU utilization.

Answer

An availability set

Answer

A Recovery Services vault

Answer

Boot diagnostics

Question 9

You are deploying a stateless web application on Azure virtual machines. The solution must automatically add and remove instances based on CPU demand and allow all instances to be managed as one logical group. Which Azure compute feature should you deploy?

Accepted Answer

A Virtual Machine Scale Set. A Virtual Machine Scale Set (VMSS) is the correct Azure compute feature because it automatically manages a group of identical, load-balanced VMs that can scale in and out based on CPU demand using autoscale rules. It treats all instances as a single logical group, enabling unified management, patching, and application deployment, which is exactly what the stateless web application requires.

Answer

An availability set

Answer

A Recovery Services vault

Answer

Boot diagnostics

Question 10

A line-of-business application must keep running even if one datacenter in an Azure region has an outage. Which deployment option should you choose for the VMs?

Accepted Answer

Availability zones. Availability zones (Option C) are physically separate datacenters within an Azure region, each with independent power, cooling, and networking. Deploying VMs across two or more zones ensures that if one datacenter fails, the application continues running in the other zone, meeting the requirement for resilience against a single datacenter outage.

Answer

An availability set

Answer

A single virtual machine with Premium SSD

Answer

A proximity placement group

Question 11

A line-of-business app requires protection against a datacenter outage in a region that supports zones. You want the strongest placement resilience available for the VMs. What should you choose?

Accepted Answer

Availability zone. Availability zones are physically separate datacenters within an Azure region, each with independent power, cooling, and networking. Deploying VMs across zones provides the strongest resilience against a datacenter outage because if one zone fails, the other zones remain operational. This is the highest level of protection available within a single region for IaaS VMs.

Answer

Availability set

Answer

Virtual machine scale set

Answer

Resource lock

Question 12

A company runs two identical Linux VMs for a stateless web app in an Azure region that supports availability zones. The business requires protection from a full datacenter outage, not just planned host maintenance. Which deployment choice best meets this requirement?

Accepted Answer

Deploy the VMs across availability zones.. Deploying the two VMs across different availability zones ensures that each VM resides in a physically separate datacenter within the region. This architecture protects against a full datacenter outage, as an availability zone failure affects only one zone, leaving the other VM operational. Availability zones provide a 99.99% SLA for VMs when two or more instances are deployed across zones, which aligns with the requirement for protection beyond planned host maintenance.

Answer

Place both VMs in an availability set.

Answer

Use a proximity placement group for both VMs.

Answer

Deploy both VMs in a single-zone virtual machine scale set.

Question 13

A stateless web app on Azure must add or remove instances automatically when CPU usage changes. Which service should you deploy?

Accepted Answer

Virtual machine scale set with autoscale. A virtual machine scale set (VMSS) with autoscale is the correct choice because it is designed to automatically increase or decrease the number of VM instances based on metrics like CPU usage. Autoscale rules can be configured to scale out when CPU exceeds a threshold (e.g., 75%) and scale in when it drops below a threshold, ensuring the stateless web app handles variable load without manual intervention.

Answer

Single virtual machine

Answer

Availability set

Answer

Managed disk

Question 14

A company has two application VMs in the same Azure region. The main requirement is to reduce downtime during planned host maintenance. The business does not require protection from a complete datacenter outage. Which option should you choose?

Accepted Answer

Availability set. An availability set distributes VMs across multiple fault domains and update domains within a single Azure datacenter. During planned host maintenance, Azure updates one update domain at a time, ensuring that only a subset of VMs are rebooted simultaneously, thereby reducing downtime. This meets the requirement of protecting against planned maintenance without needing cross-datacenter redundancy.

Answer

Availability zones

Answer

Virtual machine scale set

Answer

Proximity placement group

Question 15

A stateless web service must handle traffic spikes by adding or removing instances automatically based on CPU usage. Which Azure service fits best?

Accepted Answer

Virtual machine scale set with autoscale. A Virtual Machine Scale Set (VMSS) with autoscale is the correct choice because it automatically adjusts the number of VM instances based on CPU utilization metrics, enabling the stateless web service to handle traffic spikes by scaling out (adding instances) and scaling in (removing instances) as needed. This aligns with the requirement for a stateless, elastic, and automated scaling solution.

Answer

One larger standalone VM

Answer

Availability set with two VMs

Answer

Recovery Services vault backup