AWS recently introduced NLB (Network load balancer) where EIP (Elastic IP) can be linked to a AZ (availability zone). It is recommended to have NLB over multiple AZs hence have multiple EIP linked to each.
But what happens when one of the AZ goes down, does the linked EIP gets linked to other AZ till the original AZ comes back again? This is important if you are using single EIP (i.e. using one AZ for NLB) where such failure can cause traffic failures even though your servers running on multi-AZs are up and running.