Introduction to Azure Virtual Networks

Azure Virtual Network (VNet) is the fundamental building block for your private cloud on Azure. It represents your own network in Azure, providing a logically isolated section of the Azure cloud for your resources. You can then use VNet to launch your Azure resources, such as Azure Virtual Machines, which can then securely communicate with each other, with the internet, and with your on-premises networks.

What is an Azure Virtual Network?

An Azure Virtual Network enables many types of Azure computing resources, such as Virtual Machines, to communicate securely with each other, the internet, and on-premises locations. A VNet is:

• Logically isolated: Each VNet is isolated from every other Azure virtual network.
• Customizable: You define your own IP address space, subnets, route tables, and network gateways.
• Secure: You can control network traffic using Network Security Groups (NSGs) and apply security policies.

Key Features and Benefits

Azure Virtual Networks offer a comprehensive suite of features to build and manage your cloud network:

Resource Isolation

VNet provides a private and secure environment for your Azure resources, ensuring that your deployments are isolated from other Azure customers.

Hybrid Connectivity

Seamlessly connect your on-premises networks to your Azure VNets using VPN Gateway or ExpressRoute for a true hybrid cloud experience.

Network Security

Implement robust security measures with Network Security Groups (NSGs) to filter network traffic, and Azure Firewall for advanced threat protection.

Scalability and Performance

Designed to scale with your applications, Azure VNet provides high bandwidth and low latency, crucial for demanding workloads.

Advanced Networking Capabilities

Leverage features like VNet peering to connect VNets, User Defined Routes (UDRs) for traffic control, and Load Balancers for distributing traffic.

Common Use Cases

Azure Virtual Networks are essential for a wide range of scenarios:

• Deploying a multi-tier application: Isolate your web servers, application servers, and databases in different subnets.
• Extending your on-premises datacenter: Create a hybrid cloud by connecting your existing infrastructure to Azure VNet.
• Securing sensitive workloads: Implement strict access controls and security policies to protect critical data and applications.
• Disaster Recovery: Set up mirrored environments in Azure for business continuity.

Getting Started

To start using Azure Virtual Networks, you'll typically perform the following steps:

1. Create a Virtual Network: Define your address space and initial subnets.
2. Create Subnets: Divide your VNet into smaller, manageable network segments.
3. Deploy Resources: Launch your virtual machines and other resources within your VNet.
4. Configure Security: Set up NSGs and other security measures.
5. Establish Connectivity: Connect to your on-premises network if needed.

For detailed guidance, refer to the Key Concepts and Address Spaces sections.