provided answer is correct !
a dedicated subnet is required for the application gateway.You can have multiple instances of a given application gateway deployment in a subnet. You can also deploy other application gateways in the subnet. But you can't deploy any other resource in the application gateway subnet. You can't mix v1 and v2 Azure Application Gateway SKUs on the same subnet.
https://learn.microsoft.com/en-us/azure/application-gateway/configuration-infrastructure
is B is Honey
App GWY subnet can only have App GWY and nothing also due to dynamic deployment of App GWY instance if required - V1 require /26 subnet but v1 no longer valid, V2 App GWY requires /24 subnet.
You may ask yourself how would App GWY deployment NOT pickup certain subnets even though they are /24, this is because of the NAMING - if name of GatewaySubnet exist it will not choose it as Valid subnet
more here
Application Gateway (Standard or WAF) SKU can support up to 32 instances (32 instance IP addresses + 1 private frontend IP configuration + 5 Azure reserved) – so a minimum subnet size of /26 is recommended
Application Gateway (Standard_v2 or WAF_v2 SKU) can support up to 125 instances (125 instance IP addresses + 1 private frontend IP configuration + 5 Azure reserved). A minimum subnet size of /24 is recommended.
Subnet2 is the only one that doesn't have any resources and it is not a gateway subnet.
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Highly Voted 1 year agoLazylinux
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