Azure Network Security Group
Azure Network Security Group (NSG) is a cloud-based network security service in Microsoft Azure that controls inbound and outbound traffic to Azure resources, such as virtual machines and subnets. It acts as a stateful firewall, allowing administrators to define security rules based on source/destination IP addresses, ports, and protocols to filter network traffic. NSGs are essential for implementing network segmentation and enforcing security policies in Azure virtual networks.
Developers should learn Azure NSG when building secure cloud applications on Azure, as it provides granular control over network traffic to protect resources from unauthorized access and attacks. It is particularly useful for scenarios like isolating development and production environments, securing web applications by restricting access to specific ports (e.g., HTTP/HTTPS), and complying with regulatory requirements by enforcing least-privilege access. Using NSGs helps prevent data breaches and ensures robust network security in hybrid or multi-cloud deployments.