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Review Questons 1. The original commercial version of Ethernet supported 10 Mbps bandwidth; the version introduced in the early 1990s supports 100 Mbps; and in 1998, Gigabit Ethernet was introduced. All versions use the same data frame formats, with the same maximum PDU sizes, so they can interoperate freely.
For example if you have CAT6 Ethernet cable connected to your router which has Gigabit Ethernet (1000 Mbps) ports, and it is connected to a old PC with a 10 Mbps NIC (network interface card) then your connection speed would be limited to 10 Mbps.igabit Ethernet is 1000 Mbps using CAT6 or CAT5e UTP cable and devices. Ethernet connections are determined by the speed of the port and the cabling.