Azure Networking

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Gateway transit Ref is a peering property that lets one virtual network use the VPN gateway in the peered virtual network for cross-premises or VNet-to-VNet connectivity.
- The transit option can be used with all VPN Gateway SKUs except the Basic SKU.
You can disable the automatic route propagation from the VPN gateway. Create a routing table with the “Disable BGP route propagation” option, and associate the routing table to the subnets to prevent the route distribution to those subnets.

Traffic Manager
Front Door
(Network) Load Balancer
Application Gateways support autoscaling of the gateways themselves, whereas layer 4 load-balancers do not

Setting up a S2S VPN from on-prem to an Azure VNet requires a Virtual Network Gateway (VNG) and a Local Network Gateway (LNG). The VNG represents the Azure/VNet side of the connection, and the LNG represents the on-prem side.
If you make a change to the topology of your network, VPN client packages must be downloaded and installed again for the changes to be applied.
Enabling gateway transit on a VNet is necessary if peered VNets need to use the gateway to get a (on-prem) network.

Azure DNS