11.6. Two Additional Advanced Features of Switches

Switches really expand our flexibility when designing our networks. The features that we need to cover for the CompTIA Network+ objectives are as follows:

  • Power over Ethernet (PoE)

  • Port Mirroring/Spanning

11.6.1. Power over Ethernet (PoE)

Power over Ethernet (PoE) technology describes a system for transmitting electrical power, along with data, to remote devices over standard twisted-pair cable in an Ethernet network. This technology is useful for powering IP telephones (Voice over IP (VoIP)), wireless LAN access points, network cameras, remote network switches, embedded computers, and other appliances—situations where it would be inconvenient, expensive, and possibly not even feasible to supply ...

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