Update toc.md

toc.md

@@ -90,6 +90,20 @@ hoping that this version is still useful to you.
 
 ## Provisioning ADB: Guidelines for Networking and Security
 
+Azure Databricks (ADB) deployments for very small organizations, PoC applications, or for personal
+education hardly require any planning. You can spin up a Workspace using Azure Portal in a matter of
+minutes, create a Notebook, and start writing code.
+
+Enterprise-grade large scale deployments are a different story altogether. Some upfront planning is
+necessary to avoid cost overruns, throttling issues, etc. In particular, you need to understand:
+● Networking requirements of Databricks
+● The number and the type of Azure networking resources required to launch clusters
+● Relationship between Azure and Databricks jargon: Subscription, VNet., Workspaces, Clusters,
+Subnets, etc.
+● Overall Capacity Planning process: where to begin, what to consider?
+Let’s start with a short Azure Databricks 101 and then discuss some best practices for scalable and
+secure deployments.
+
 ### Sub-heading
 
 This is an h2 heading