So I have my website set up, call it www.mywebsite.com. I have my Traffic Manager set up so that www.mywebsite.com points to mytrafficmanager.trafficmanager.com.
The Traffic Manager then points to my two on-premise web front-ends web1.mywebsite.com and web2.mywebsite.com. It also has an endpoint of a Azure Web App.
It is set up to do a Priority fail over: web1, then if that fails to web2, and if they are both down, to fail over to the Azure Web App.
My question is this: If I get a DDoS attack on www.mywebsite.com, what would happen? Would the on-premise servers go down, and then it would fail over to the Azure Web App (which is set up to scale appropriately to hopefully mitigate a DDoS attack). Or would it not be able to route the traffic properly?