Which nodes are supported in a distributed Cisco ISE deployment?

In a distributed Cisco ISE deployment, Policy Service Nodes (PSNs) are responsible for handling authentication, authorization, and accounting (AAA) services. They are typically deployed in pairs or groups to provide high availability and support session failover, ensuring that AAA services remain continuously available even if one PSN becomes unavailable.

Administration nodes provide management services and support failover for administrative functions, not for 'session failover' of user/device AAA sessions, which is handled by PSNs.

Monitoring nodes primarily collect and store operational and logging data. While PxGrid services can run on various nodes, 'Monitoring nodes for PxGrid services' is not their core function related to distributed deployment high availability like session failover.

While Policy Service nodes do provide automatic failover, option A 'Policy Service nodes for session failover' is a more specific and accurate description of the high availability mechanism they offer for ongoing user/device sessions.