About DNS Group Objects
Domain Name System (DNS) groups define a list of DNS servers and some associated attributes. DNS servers are needed to resolve fully-qualified domain names (FQDN), such as www.example.com, to IP addresses. Prior to creating a DNS group object, you must configure a DNS server.
You can configure different DNS group for management and data interfaces.
To configure a DNS server in CDO, see Firepower Threat Defense Device Settings; to configure a DNS server in FDM, see Configuring DNS for Data and Management Interfaces in the Cisco Firepower Device Manager Configuration Guide, Version 6.4. or later.
Create a DNS Group Object
You must create a DNS group object in FDM. See Configuring DNS Groups for more information.
Like any other object, during the onboarding process, CDO reads-into its database any DNS object groups that exist in FDM. Once they have been stored on CDO, they can seen on the Objects page. See the Configuring DNS Groups chapter of the Cisco Firepower Device Manager Configuration Guide, Version 6.4. or later.