What is the role of Power over Ethernet (PoE)?

Power over Ethernet (PoE) plays a crucial role in the ability to deliver both power and data over a single Ethernet cable, enabling the powering of devices like IP cameras, wireless access points, and VoIP phones directly through their network cables. This eliminates the need for additional wiring or external power supplies, streamlining installation and reducing clutter.

The technology works by allowing compatible network switches or injectors to supply electrical power through the data cables, adhering to certain standards that ensure devices receive the appropriate voltage and current they require for operation. This capability is particularly beneficial in situations where traditional power sources are not readily available or would complicate the installation process, such as in ceiling-mounted security cameras or outdoor access points.

While other options address different aspects of networking, they do not pertain to the specific functionality that PoE provides in powering devices via Ethernet cables. This unique attribute underlines why option B is the correct choice.