Google's load balancers are global - as in they will route requests to the nearest region to the user without you having to run separate load balancers in each with dns routing.

The backend services hooked up to the load balancer can have healthchecks and capacity limits based on req/sec or CPU usage, so a region that's close by but overloaded will be skipped for a further region that has available capacity.

GCP also absorbs layer 4 and below attacks automatically. https://cloud.google.com/files/GCPDDoSprotection-04122016.pd...