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Cisco Certified Network Associate (CCNA) · Cisco
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B. is correct. It is a confusing question. Both Enables powered-device detection, but the key different is: Static — Enables powered-device detection; pre-allocates (reserves) power for a port... and guarantees that power will be provided upon device detection. Auto - doesn't guarantee power if all ports on the switch are fully utilizing the power budget.
B is correct.
The correct PoE mode that enables powered-device (PD) detection and guarantees power once the device is detected is auto. In auto mode, the switch port actively detects if a powered device (like an IP phone or camera) is connected, and if so, it supplies power accordingly, meeting the requirement of detection and guaranteed power after detection. While static mode also guarantees power, it forces power on the port whether a device is detected or not, which isn't aligned with the question's emphasis on detection. Dynamic and active are not standard PoE modes in Cisco terminology. Therefore, auto is the best fit for the described behavior.