What device or component is used to inject power into PoE cabling to power connected devices such as wireless access points and VoIP phones?

• A. Power over Ethernet (PoE)
• B. Quality of Service (QoS)
• C. Ransomware
• D. Privacy

Answer: (A)

Power over Ethernet is the technology that sends electrical power along the same Ethernet cable used for data, so devices like wireless access points and VoIP phones can be powered without a separate power supply. The component that actually provides that power into the PoE cabling is a PoE injector or a PoE-capable switch; it delivers DC power onto the Ethernet pairs so the connected device can draw what it needs. This approach simplifies deployment and reduces cabling.

QoS is about prioritizing traffic, not delivering power. Ransomware is malware that encrypts data for ransom, and privacy concerns confidentiality, neither of which relate to powering devices over Ethernet.