Azure Network Security Groups

Azure Network Security Groups (NSGs) are a core Azure networking service that provides stateful packet filtering to control inbound and outbound traffic to Azure resources like virtual machines, subnets, and network interfaces. They act as a virtual firewall, allowing administrators to define security rules based on source/destination IP addresses, ports, and protocols. NSGs are essential for implementing network segmentation and enforcing security policies in Azure virtual networks.

Also known as: Azure NSG, NSG, Network Security Group, Azure Security Groups, Azure Firewall (common misassociation)

Why learn Azure Network Security Groups?

Developers and cloud engineers should learn Azure NSGs when building secure applications on Azure, as they are fundamental for protecting resources from unauthorized access and network-based attacks. They are crucial for scenarios like isolating development and production environments, complying with regulatory requirements (e.g., PCI DSS), and implementing defense-in-depth strategies in cloud deployments. Use NSGs to restrict traffic to specific ports (e.g., allowing SSH only from trusted IPs) and manage network flow in complex architectures.

Learning Resources

• docs: Azure Network Security Groups documentation
• course: Microsoft Learn: Secure and isolate access to Azure resources with network security groups
• video: YouTube: Azure NSG Tutorial for Beginners
• course: Pluralsight: Azure Network Security
• docs: Azure NSG best practices guide