Question
In AWS, for Route 53, when you choose the [...] routing policy for your DNS records (i.e. you specifiy multpile A records with the same Name/Type but different values, e.g. different IPs), Route 53 will return to the user the value of the primary/active server IP if it is available (i.e if it passes configured health check), if not availble, if will return to the user the value of the secondary/passive server IP.