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A network security group (NSG) is a networking filter containing a list of security rules that when applied will allow or deny network traffic to resources connected to Azure VNets. These rules can manage both inbound and outbound Traffic. NSGs can be associated to subnets, individual Network Interfaces attached to ARM VMs, and Classic VMs.

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Cover of Exam Ref 70-533 Implementing Microsoft Azure Infrastructure Solutions

Note

NSG manage the inbound and outbound traffic of the VM, Network interface and VNET.