Azure Virtual Networking
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Azure virtual networks (VNets) and subnets enable seamless communication between Azure resources such as VMs, web apps, and databases. They also facilitate interaction with users on the internet and your on-premises client computers. Think of an Azure virtual network as an extension of your on-premises network, integrating and linking various Azure resources.
Key Networking Capabilities
Azure virtual networks offer several essential features, including:
Isolation and Segmentation
Azure virtual networks allow you to establish multiple isolated networks by defining private IP address spaces. These IP ranges are exclusive to the virtual network and are not routable on the internet. You can divide these IP spaces into subnets, each with its own designated address space.
For DNS resolution, Azure provides a built-in service, or you can configure the virtual network to use your own internal or external DNS servers.
Internet Communications
To facilitate incoming connections from the internet, assign a public IP address to your Azure resource or place it behind a public load balancer.
Communication Between Azure Resources
Secure communication between Azure resources is achieved through:
Communication with On-Premises Resources
Azure virtual networks enable integration with on-premises environments, creating a network that spans both local and cloud infrastructures. Connectivity options include:
Route Network Traffic
Azure routes traffic between subnets, connected virtual networks, on-premises networks, and the internet by default. You can control and customize this routing using:
Filter Network Traffic
Traffic between subnets can be filtered using:
Connect Virtual Networks
Virtual network peering links multiple VNets, allowing them to communicate directly. Traffic between peered networks remains private and is routed over the Microsoft backbone network. This setup enables communication between resources in different VNets, even across regions, creating a global network architecture.
User-defined routes (UDR) allow you to customize routing tables within and between virtual networks, providing precise control over traffic flow.
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