Cisco CCNA (200-301)Network FundamentalsMedium
A network administrator needs to provide power to a new wireless access point located in a ceiling, where no electrical outlets are readily available. The AP supports 802.3at. Which technology can be used to deliver both data and power over a single Ethernet cable?
- APower over Ethernet (PoE+)
- BFiber Optic Cable
- CCoaxial Cable
- DUSB-C Power Delivery
Show answer & explanationAnswer & explanation
Correct answer: A. Power over Ethernet (PoE+)
Power over Ethernet (PoE) allows electrical power to be transmitted along with data on Ethernet cabling. The 802.3at standard, also known as PoE+, provides up to 25.5W to the powered device, which is suitable for many modern wireless access points.
Why the other options are wrong
- B. Fiber optic cables transmit data using light and do not carry electrical power.
- C. Coaxial cables are typically used for cable television or older network standards (e.g., 10BASE2) and do not natively support PoE for modern APs.
- D. USB-C Power Delivery is for USB connections, not standard Ethernet cabling.
Power over Ethernet (PoE)
PoE is a networking standard that allows electrical power to be delivered over Ethernet cables alongside data, simplifying installation of devices like IP cameras and wireless APs.
- Eliminates the need for separate power outlets.
- Standards include 802.3af (PoE), 802.3at (PoE+), and 802.3bt (PoE++).
- Requires a Power Sourcing Equipment (PSE) and a Powered Device (PD).
Memory trick: Ethernet brings data, but PoE brings the power too, like a two-in-one cable!