Which statement accurately describes the power delivery of PoE (802.3af) and PoE+ (802.3at) per port?

• A. 802.3af provides up to about 7.5W per port; 802.3at provides up to about 15W per port
• B. 802.3af devices require no power over PoE
• C. 802.3at provides up to about 30W per port
• D. 802.3at is used only for data and provides no power

Answer: (C)

Power delivery per port is defined by the PoE standards. 802.3af (PoE) allows up to about 15.4 W to a powered device per port, with actual usable power typically around 12.95 W after losses. 802.3at (PoE+) raises that ceiling to roughly 30 W per port from the switch, enabling higher‑power devices. The best answer reflects that PoE+ can provide up to about 30 W per port. The other statements conflict with how PoE is designed: devices on PoE still require power, PoE+ is not limited to data only, and the commonly cited 7.5 W/15 W figures do not match the standard limits for these technologies.