Azure Networking Components Overview

Key components for Azure Networking:
Azure Virtual Network
IP Addressing in Virtual Networks
Azure Load Balancer
Application gateways
Domain Name System (DNS)
Subnets
Microsoft Azure Traffic Manager
Cross-Premises Network Connectivity: VPN Gateway ExpressRoute

Azure offer two deployment models: Azure Resource Manager vs. classic deployment: Understand deployment models and the state of your resources.
1. Azure Classic Deployment Model
2. Azure Resource Manager Deployment Model
Microsoft is moving towards the Resource Manager deployment model.
Azure Resource Manager contains a network provider that provides advanced control and network management capabilities.
Advantages of using Azure Resource Manager to configure Azure Virtual Networks

• Faster configuration due to resources being grouped.
• Easier management.
• Customization and deployment based on JavaScript Object Notation (JSON) templates.
• Networking resources such as IP addresses, DNS settings, or NICs are managed independently and can be assigned to VMs, Azure load balancers, or application gateways.

You can create Azure network resources by using either the Azure Portal, Azure PowerShell module, Azure command-line interface (Azure CLI), or by using deployment templates as well.

Connecting to Virtual Networks
There are several ways to connect to Azure VNet:-
Cloud-Only Virtual Networks
Point-to-Site VPNs
Site-to-Site VPNs
ExpressRoute
VNet-to-VNet

Planning IP Address Space
Always plan to use an address space that is not already in use in your organisation, either on-premises or in other VNets. Even if you plan for a VNet to be cloud-only, you may want to make a VPN connection to it later. If there is any overlap in address spaces at that point, you will have to reconfigure or recreate the VNet.

Subnet Allocation
You must also sub-divide the VMs and cloud services in your VNet by providing one or more subnets.

Planning for Name Resolution

Name Resolution Scenarios