Azure Series - Virtual Network - Exploring Key Scenarios with Virtual Networks and Creating an Azure Virtual Network with Subnets

Virtual networks (VNets) are essential components of cloud computing that enable secure and seamless communication between resources within the same cloud infrastructure. In this article, we will delve into the key scenarios where virtual networks play a vital role and provide a step-by-step guide on creating an Azure Virtual Network with subnets, using Microsoft Azure as our cloud platform of choice.

Key Scenarios with Virtual Networks

1. Isolated Environment: Virtual networks offer the ability to create isolated environments, commonly known as subnets, which allow organizations to compartmentalize their resources. This isolation ensures that sensitive data and critical applications remain secure and are shielded from unauthorized access.

2. Resource Segmentation: By deploying multiple subnets within a virtual network, an organization can effectively segregate different types of resources based on their function and security requirements. For example, a three-tier application can have separate subnets for web servers, application servers, and database servers, each with its own set of security rules.

3. Site-to-Site Connectivity: Virtual networks enable secure connectivity between on-premises networks and cloud-based resources. Organizations can extend their on-premises network to Azure by establishing a site-to-site VPN tunnel, enabling seamless and secure data transfer between the two environments.

4. Multi-Region Deployment: For businesses with a global presence, Azure Virtual Networks can span across multiple regions, facilitating a multi-region deployment strategy. This ensures high availability and disaster recovery, as resources can be replicated and distributed across different regions.

5. Network Security Groups: Azure Virtual Networks come equipped with Network Security Groups (NSGs) that allow the implementation of fine-grained security rules for inbound and outbound traffic. NSGs help in controlling network traffic flow and protecting resources from unauthorized access.

Creating an Azure Virtual Network with Subnets

Now, let's walk through the steps to create an Azure Virtual Network with subnets using the Azure portal:

1. Sign in to the Azure portal and navigate to "Create a resource."

2. Type "Virtual Network" in the search bar and select "Virtual Network" from the search results.

3. Click "Create" to start the creation process.

4. Provide the required details, such as the name of the virtual network, the region where it will be deployed, the IP address space, and the subnet details.

5. Configure the subnets within the virtual network by specifying the subnet name and its IP address range.

6. Add additional subnets as needed to fulfill your resource segregation requirements.

7. Configure the network security groups for each subnet to control traffic flow and enhance security.

8. Review all the settings, and once satisfied, click "Create" to create the Azure Virtual Network along with the specified subnets.