The correct answer is D. Injector .
Power over Ethernet (PoE) allows network cables to carry electrical power to devices such as wireless access points, IP cameras, and VoIP phones, eliminating the need for separate power supplies. According to the CompTIA A+ Core 1 220-1201 objectives under Networking, PoE can be implemented in the following ways:
PoE-enabled switches : Switches that can supply power directly over the Ethernet ports.
PoE injectors : Devices that add power to an existing Ethernet connection when the switch or router does not provide PoE.
Why the other options are incorrect:
A. Modem : A modem connects a network to the Internet but does not provide PoE functionality.
B. Range extender : Extends the range of a wireless network; does not supply power over Ethernet.
C. Media converter : Converts one type of network media to another (e.g., fiber to copper) but does not implement PoE.
Therefore, when a switch does not natively provide PoE, a PoE injector is the standard solution to add power to the Ethernet line.
[References:, CompTIA A+ Core 1 (220-1201) Exam Objectives – Networking: "Given a scenario, install and configure network devices including switches, routers, and wireless access points, including cabling and PoE." , Mike Meyers’ CompTIA A+ Certification Guide, 13th Edition, Networking Devices Chapter.]
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