We want to have high availability for the external dns name server service. Prevent service down of Exchange or web service. Due to the security concerns, we do not have external dns server. All records at hosted by one service provider.
But the network of that service provider is not stable recently. Is it possible to allow DNS records hosted by two different service provider to have high availablility? That is, if service provider A is down, service provider B can handle all service with least down time.