Which probe is best suited for obtaining near real-time profiling data from endpoints?

The best choice for obtaining near real-time profiling data from endpoints is SNMP Trap.

SNMP Traps are asynchronous notifications sent from network devices to a management system, providing immediate information about events, states, or changes within the devices. This method is advantageous for profiling because it allows for real-time updates on the status of devices on the network. When an event occurs—such as a device connecting or changing its status—the trap is sent instantly, enabling the Identity Services Engine (ISE) to capture and analyze that information without delay.

In contrast, while options like DHCP and RADIUS are also used in the profiling process, they may not provide updates as rapidly or comprehensively as SNMP Traps. DHCP operates based on requests and leases, which can introduce latency. NetFlow, while useful for monitoring traffic patterns and providing insights into network performance, does not inherently focus on endpoint profiling as effectively as SNMP Traps. Thus, SNMP Traps stand out as the most effective choice for gathering near real-time profiling data.