AZ-104 Certification Notes

Chapter 9 - Introduction

Azure Virtual Machines

Choose an OS, Compute, Memory, and Storage and launch a server in minutes.

Introduction to Azure VMs

Azure Virtual Machines (VMs) are a highly configurable server. Virtualization lets you run a server without having to buy and maintain the physical hardware that runs it.

• Virtual Machines still require maintenance such as:
  • Applying OS system patches
  • Installing and configuring packages

Some thing you should know:

• The size of the virtual machine is determined by the image
  • The image defines the combination of vCPUs, Memory, and Storage Capacity
• The current limit on a per subscription basis is 20 VMs per region
• Azure VMs are billed at an hourly rate
• A single instance VMs has an availability of 99.9% (when all storage disks are premium)
• Two instances deployed in Availability Set will give you 99.95% availability

When you launch an Azure Virtual Machine other networking components will be either created or associated to your Virtual Machine.

• Network Security Group (NSG) - attached to the NIC, virtual firewall with rules around ports and protocols
• Network Interface (NIC) - a device that handles IP protocols and network communication
• Virtual Machine Instance - The actual running server
• Public IP Address - The address that you will use publicly access your VM
• Virtual Network (VNet) - The network where your VM will reside

Practice Quiz

• What is true about Azure VMs?

  • Azure VMs are billed at an hourly rate
  • A single instance VMs has an availability of 0.99%
  • The current limit on a per subscription basis is 25000 VMs per region
  • The size of the virtual machine is determined by the Image

• What networking component is a device that handles IP protocols and network communication?

  • Virtual Machine instance
  • Network Interface (NIC)
  • Public IP Address
  • Network Security Group (NSG)

• What networking component is attached to the NIC, virtual firewall with rules around ports and protocols?

  • Public IP Address
  • Virtual Network (VNet)
  • Network Security Group (NSG)
  • Network Interface (NIC)

• What is a highly configurable server, in which virtualization lets you run a server without having to buy and maintain the physical hardware that runs it?

  • Azure Virtual Machines (VMs)

• What is Virtual Network (VNet)?

  • The network where your VM will reside.