A certificate signing request (CSR) is one of the first steps towards getting your own SSL Certificate. Generated on the same server you plan to install the certificate on, the CSR contains information (e.g. common name, organization, country) that the Certificate Authority (CA) will use to create your certificate. It also contains the public key that will be included in your certificate and is signed with the corresponding private key

Cisco ISE allows a global configuration to issue a Change of Authorization (CoA) in the Profiler Configuration page that enables the profiling service with more control over endpoints that are already authenticated. One of the settings to configure the CoA type is "Reauth". This option is used to enforce reauthentication of an already authenticated endpoint when it is profiled. Reference: https://www.cisco.com/c/en/us/td/docs/security/ise/1-3/admin_guide/b_ise_admin_guide_13/ b_ise_admin_guide_sample_chapter_010101.html page that enables the profiling service with more control over endpoints that are already authenticated.
One of the settings to configure the CoA type is "Reauth". This option is used to enforce reauthentication of an already authenticated endpoint when it is profiled.
Reference:
Cisco ISE allows a global configuration to issue a Change of Authorization (CoA) in the Profiler Configuration page that enables the profiling service with more control over endpoints that are already authenticated. One of the settings to configure the CoA type is "Reauth". This option is used to enforce reauthentication of an already authenticated endpoint when it is profiled. Reference: https://www.cisco.com/c/en/us/td/docs/security/ise/1-3/admin_guide/b_ise_admin_guide_13/ b_ise_admin_guide_sample_chapter_010101.html