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POE, Traffic Filtering, Diagnostics and QoS This lesson covers Power over Internet (POE) and is useful for devices that need to be powered over a single standard Ethernet cable such as VOiP phones. The cable provides data and power. This lesson also covers traffic filtering which allows the router to inspect different packets and can be filtered by IP address and packet types. Participants also learn about diagnostics and QoS, Quality of Service, which prioritizes different packet types.