Update LAB_04-Implement_Virtual_Networking.md

Author: staleycyn

Instructions/Labs/LAB_04-Implement_Virtual_Networking.md

@@ -61,7 +61,9 @@ The organization plans a large amount of growth for core services. In this task,
 	| ------------------ | -------------------- |
 	| IPv4 address space | Replace the prepopulated IPv4 address space with `10.20.0.0/16` (separate the entries)  |
 
-1. Select **+ Add a subnet**. Complete the name and address information for each subnet. Be sure to select **Add** for each new subnet. Be sure to delete the default subnet - either before or after creating the other subnets.
+1. Select **+ Add a subnet**. Complete the name and address information for each subnet. Be sure to select **Add** for each new subnet. 
+
+	>**Note:** Be sure to delete the default subnet - either before or after creating the other subnets.
 
 	| **Subnet**             | **Option**           | **Value**              |
 	| ---------------------- | -------------------- | ---------------------- |
@@ -373,3 +375,4 @@ Congratulations on completing the lab. Here are the main takeaways for this lab.
 
 
 
+