In the previous chapter, we covered the third part of the Deploy and Configure Infrastructure objective. We covered virtual machines (VMs) in Azure, as well as the different VM sizes that are available for both Azure and Linux. We also learned how to provision VMs and how to create and deploy Azure Resource Manager (ARM) templates. 

This chapter introduces the fourth part of this objective. In this chapter, we are going to focus on virtual networking in Azure and how you can implement and manage this. You will learn about the basics of Azure virtual networking, including private and public IP addresses, and learn how to configure subnets, Virtual Networks (VNets), and public and private IP addresses. 

The following topics will be covered in this chapter:

• Understanding Azure VNet
• Understanding IP addresses
• Configuring subnets and VNets
• Configuring private and public IP addresses
• User-defined routes