What is Azure NSG? At what level can that be configured? What other services can be used for restricting traffics at different levels?

What is Azure NSG? At what level can that be configured?

• Answer:
  Azure NSG: https://docs.microsoft.com/en-us/azure/virtual-network/network-security-groups-overview

Azure NSG can be configured at VM Level (NIC) and at Subnet Level. We can use Azure Firewall service at VNet and Subscripition level to restrict and allow network traffic.