- An appliance by security vendors (cisco,etc.)
- NVA can also be a windows server with required roles and routes defined in it
- They control traffic flow
- Used in conjunction with Custom routes
- so for example, all incoming public traffic goes to a dmz subnet where you have NVA availability set.
references:
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Azure Firewall or NVA
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Place the instances behind an Azure Load Balancer, Azure Application Gateway or NVA which has a Public IP Address in the front-end configuration