What delivers electrical power through standard network cables?

What delivers electrical power through standard network cables?

• A. Quality of Service (QoS)
• B. VLAN tagging
• C. Power over Ethernet (PoE)
• D. Link Aggregation Control Protocol (LACP)

Answer: (C)

Power over Ethernet is the method that enables electrical power to be delivered over standard network cables while data is carried. It allows devices like IP phones, wireless access points, and security cameras to run on power through the same Ethernet cable that handles their data, using PoE-enabled switches or injectors. Different PoE standards (such as 802.3af, 802.3at, and 802.3bt) define how much power can be delivered and how power is negotiated between the power source and the powered device. This streamlines deployments by reducing the need for separate power outlets and simplifies cabling. Other features like Quality of Service focus on prioritizing traffic, VLAN tagging isolates traffic into separate networks, and Link Aggregation Control Protocol combines multiple physical links for higher bandwidth and redundancy. None of these provide electrical power over the cable, which is why PoE is the correct concept here.

Power over Ethernet is the method that enables electrical power to be delivered over standard network cables while data is carried. It allows devices like IP phones, wireless access points, and security cameras to run on power through the same Ethernet cable that handles their data, using PoE-enabled switches or injectors. Different PoE standards (such as 802.3af, 802.3at, and 802.3bt) define how much power can be delivered and how power is negotiated between the power source and the powered device. This streamlines deployments by reducing the need for separate power outlets and simplifies cabling.

Other features like Quality of Service focus on prioritizing traffic, VLAN tagging isolates traffic into separate networks, and Link Aggregation Control Protocol combines multiple physical links for higher bandwidth and redundancy. None of these provide electrical power over the cable, which is why PoE is the correct concept here.