adding Secondary DNS and NTP

Hello , 

we are planning to deploy a new VxRail Cluster that use external DNS, currently we only one external domain controller that we will use as an external DNS and NTP for example 1.1.1.1 and pllanig to add additional domain contorller as a VM on the VxRail after deployment for ex 1.1.1.2 

my question now can we add 1.1.1.1 & 1.1.1.2 as external DNS in configuration wizard or the validation will fail as 1.1.1.2 not exist

or should we add only 1.1.1.1 during the initial configuration they use re-point steps to update the secondary DNS and NTP