Network Security Group (NSG)
You can filter network traffic to and from Azure resources in an Azure virtual network with a network security group. 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.
Virtual Network Gateway
A virtual network gateway is composed of two or more VMs that are deployed to a specific subnet you create called the gateway subnet. Virtual network gateway VMs contain routing tables and run specific gateway services. These VMs are created when you create the virtual network gateway. You can't directly configure the VMs that are part of the virtual network gateway.
ExpressRoute circuit
An ExpressRoute circuit represents a logical connection between your on-premises infrastructure and Microsoft cloud services through a connectivity provider. You can order multiple ExpressRoute circuits. Each circuit can be in the same or different regions, and can be connected to your premises through different connectivity providers.
Azure Firewall
Azure Firewall is a managed, cloud-based network security service that protects your Azure Virtual Network resources. It's a fully stateful firewall as a service with built-in high availability and unrestricted cloud scalability.
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