https://www.cisco.com/en/US/docs/security/ise/1.0/user_guide/ise10_dis_deploy.html
The persona or personas of a node determine the services provided by a node. An ISE node can
assume any or all of the following personas: Administration, Policy Service, and Monitoring. The
menu options that are available through the administrative user interface are dependent on the role
and personas that an ISE node assumes. See Cisco ISE Nodes and Available Menu Options for more
information.