A network security group contains security rules that allow or deny inbound network traffic to, or outbound network traffic from, several types of Azure resources. A network security group (NSG) in Azure activates a rule or access control list ( ACL), which will allow or deny network traffic to your virtual machines. Microsoft's solution to simplify virtual network security is through a management layer known as a Network Security Group (NSG) which allows. A network security group (NSG) contains a list of security rules that allow or deny network traffic to resources connected to Azure Virtual. A network security group (NSG) provides a virtual firewall for a set of cloud resources that all have the same security posture. Train thousands of people, up your skills and get that next awesome job by joining TechSnips.