-Network Security groups are associated at a subnet level or at a NIC level. When associated at a subnet level, it applies to all the VM instances in the subnet. Network Security Group view returns all the configured NSGs and rules that are associated at a NIC and subnet level for a virtual machine providing insight into the configuration. In addition, the effective security rules are returned for each of the NICs in a VM. Using Network Security Group view, you can assess a VM for network vulnerabilities such as open ports. You can also validate if your Network Security Group is working as expected based on a [comparison between the configured and the approved security rules](network-watcher-nsg-auditing-powershell.md).
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