Network Security Groups (NSGs)

Azure Cloud Data Engineering Training in Hyderabad – Quality Thoughts

Quality Thoughts offers one of the best Azure Cloud Data Engineering courses in Hyderabad, ideal for graduates, postgraduates, working professionals, or career switchers. The course combines hands-on learning with an internship to make you job-ready in a short time.

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Note: Azure Table and Queue Storage support NoSQL and message handling for scalable cloud apps

 Network Security Groups (NSGs)

In Microsoft Azure, Network Security Groups (NSGs) are used to control inbound and outbound traffic to network interfaces (NICs), virtual machines (VMs), and subnets. NSGs act as a virtual firewall that allows or denies network traffic based on rules you define. Each rule includes properties like source/destination IP, port, protocol, and priority.

NSGs are stateful, meaning if an incoming request is allowed, the response is automatically allowed, regardless of outbound rules. Rules are processed in order of priority, from lowest to highest number. Azure provides default rules to allow traffic within a VNet, allow Azure load balancer traffic, and deny all other inbound traffic.

NSGs can be associated at the subnet level (to protect multiple resources) or at the NIC level (for more granular control). If both are used, Azure combines the rules to determine the effective access.

They are commonly used to segment environments (e.g., front-end vs. back-end) and secure services by restricting unnecessary exposure. Best practices include allowing only required ports (like 80 or 443), avoiding overly permissive rules (like open to all), and logging traffic using Network Watcher NSG flow logs for monitoring and auditing.

NSGs are vital for security, compliance, and performance in cloud architectures, ensuring only authorized traffic reaches Azure resources.

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