Did some hunting, and it turns out that the DNS barclamp assigns a DNS name of the format NetworkName.HostName.DomainName for every network associated with every node except for the admin network.  If anyone is curious, see https://github.com/crowbar/barclamp-dns/blob/release/pebbles/master/chef/cookbooks/bind9/recipes/default.rb#L149
We are also guaranteed that there will be a public IP assigned to the quantum server node by https://github.com/crowbar/barclamp-quantum/blob/release/pebbles/master/crowbar_framework/app/models/quantum_service.rb#L136