DNS zones are organized within a DNS View. From the Cloud Services Portal, click Manage -> DNS -> Zones. All existing views are shown under All DNS Views. If there are multiple views, you must click the particular DNS view to drill down to view the zones and subzones. If there are no DNS views, you must create them before adding a zone. For more information about creating a DNS view, see Configuring DNS Views.
You can delegate a zone to an Authoritative DNS Server. DNS requests made to the delegated zone are serviced by the Authoritative DNS Server to which the zone is delegated. For more information about creating a zone delegation, see Configuring Zone Delegation.
...
To view the list of DNS zones, complete the following:
...
You can also create one or more secondary DNS servers for a zone. A secondary server for a zone receives read-only zone data from the primary server. If a zone is part of an internal DNS structure for a private network, the inclusion of a secondary DNS server is optional, though highly recommended. If a zone is a part of an external DNS structure for a public network such as the Internet, then a secondary server in a different subnet from the primary server is required. This requirement provides an additional safeguard against localized network failures causing both primary and secondary DNS servers for a zone to become inaccessible.
You can specify the primary and secondary server for a zone or you can specify a DNS server group. A DNS server group is a collection of one or more primary servers and one or more secondary servers. For information on DNS server groups, see Configuring DNS Server Groups.
The following is an example of an IPv4 reverse-mapping zone hierarchy:
...