A network cable can be marked and sold as Category 6A if it passes a 500 MHz bandwidth ... ‘2.5 GBit network’ actually runs at closer to Fast Ethernet speeds.
See twisted pair. Cat Type of Bandwidth Data # Cable (MHz) Rate 8 ScTP/STP 2000 MHz 40-100 Gbps 7a ScTP/STP 1000 MHz 10 Gbps 7 ScTP/STP 600 MHz 10 Gbps 6a UTP/ScTP/STP 500 MHz 10 Gbps 6 UTP/ScTP ...