Network security groups
Network security groups (NSGs) allow you to have fine-grained and explicit control over how network
traffic flows into or out of Azure VMs and subnets.
NSGs allow you to shape the network traffic flow in and out of your environment. You create rules
based on the source IP address and port and the destination IP address and port. The NSG rules can
be applied to a VM and/or a subnet. For a VM, the NSG is associated with the NIC attached to the VM.
For more information on network security groups, please see Chapter 5 and also
https://azure.microsoft.com/documentation/articles/virtual-networks-nsg/.
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