AZ-104 Certification Notes

Chapter 7.4 - Routing Virtual Networks

Describing Routing

• Routes = Paths for Connectivity
  • Routes are paths through which traffic can flow
  • For example, a route allowing virtual machines to communicate with internet outbound

Routing Types

• System Routes
  • Default routes built-in to virtual networks that cannot be modified
• Custom Routes
  • User-defined routes or borer gateway protocol (BGP) routes that override system routes

Routing Scenarios

• User-Defined Route
  • Routes created by users that take precedence over all routes
  • For example, overriding routes to the internet to either go to nothing or go to a network virtual appliance (NVA) like Azure Firewall
• BGP Route
  • Routes that are exchanged between integrated networks
  • For example, hybrid networks or VNet peering scenarios

Key Takeaways

• System Routes
  • Default routes built-in to virtual networks that cannot be modified
• Custom Routes
  • User-defined routes or BGP routes that override system routes
• Custom > BGP > System