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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.
Specified in the family of standards known as IEEE 802.3, Ethernet was originally developed by Xerox in the 1970s. Ethernet was initially designed to run over coaxial cables, but a typical Ethernet LAN now uses special grades of twisted pair cables, or fiber optical cabling.