Which of the following Power over Ethernet (PoE) standards provides the MOST power to connected devices?
Correct Answer: C
Detailed Explanation: The IEEE 802.3bt standard, also known as PoE++, provides the most power among the listed options. Here's a breakdown: 802.3af (PoE): This original PoE standard provides up to 15.4 watts of power, with a maximum of 12.95 watts available to the device after power loss in the cabling. 802.3at (PoE+ or PoE Plus): This standard increased the power output to a maximum of 30 watts, with up to 25.5 watts available to the device. 802.3bt (PoE++ or 4PPoE): This is the latest and most powerful PoE standard. It supports up to 90 watts of power, with a maximum of 71.3 watts available to the device. It uses all four pairs of twisted-pair cabling for power delivery. 802.11ac: This is a wireless networking standard, not a PoE standard. It defines how wireless devices communicate, not how they receive power. Therefore, 802.3bt (PoE++) offers the highest power delivery, making it suitable for power-hungry devices like high-end wireless access points, PTZ cameras, and other devices requiring significant power.
This CCNA practice question helps students prepare for Cisco networking certification exams by testing knowledge of network fundamentals, routing, switching, and network security concepts.