It detects the device is a powered device. In PoE auto mode, the switch detects that the connected endpoint is a powered device and allocates power based on negotiation and device requirements. Static mode reserves power whether the device actually needs that amount or not, which can waste available PoE budget on a switch. Power policing is a related feature but it is not the basic advantage of auto mode over static mode. Cisco CCNA 200-301 v1.1 Network Access includes PoE behavior because access points, IP phones, and cameras depend on switch-provided power. The corrected answer is that auto mode detects the powered device. That is the operational reason auto allocation is generally preferred for access points and other PoE endpoints when the switch can negotiate and manage power dynamically.
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