The Azure platform implements what is known as software-defined networking for the majority of the Azure fleet. This differs from Azure dedicated, where your workloads can actually be running on non-virtualized hardware. For the rest of this section, we will not address non-virtual implementations since you are probably already familiar with them.
An entire book could be devoted to Azure networking, but for the purposes of this book, we will focus on the key aspects that you need to be aware of on your modernization journey. They can broadly be thought of in two categories, as follows:
- Services that run in Azure
- Services that connect Azure to your on-premises data center
Let’s start with those that are within Azure first.