Network Security Groups

Network Security Groups (NSGs) are a cloud-based network security feature that acts as a virtual firewall to control inbound and outbound traffic for Azure resources. They allow administrators to define security rules that permit or deny network traffic based on source/destination IP addresses, ports, and protocols. NSGs are essential for implementing network segmentation and protecting resources in virtual networks.

Also known as: NSG, Azure NSG, Network Security Group, Azure Network Security Group, Virtual Network Security Group

Why learn Network Security Groups?

Developers should learn NSGs when working with Microsoft Azure to secure cloud applications and infrastructure, especially for scenarios like web applications, databases, or microservices that require controlled network access. They are crucial for compliance (e.g., PCI DSS, HIPAA) and preventing unauthorized access, such as by restricting SSH/RDP ports or allowing only specific IP ranges for API calls.

Learning Resources

• docs: Microsoft Docs: Network Security Groups
• video: Azure NSG Tutorial on YouTube
• course: Pluralsight Course: Azure Network Security
• tutorial: Azure NSG Best Practices Guide