In what IEEE standard was Ethernet originally defined?

Ethernet was originally defined in the IEEE 802.3 standard. This standard outlines the specifications for Ethernet networks, which utilize a frame-based method of data transmission and use carrier sense multiple access with collision detection (CSMA/CD) as a protocol for controlling access to the network medium.

The significance of IEEE 802.3 lies in its establishment of Ethernet as a foundational technology for local area networking (LAN), enabling devices to communicate over both wired and wireless media. It has undergone various updates and revisions since its inception, expanding its capabilities and increasing speeds, but the initial specifications are encapsulated in 802.3.

Other options refer to different aspects of networking: IEEE 802.1 deals with network architecture standards, 802.2 focuses on logical link control, and 802.11 specifies standards for wireless LANs. Thus, they do not pertain to the original definition of Ethernet itself, further highlighting the relevance of 802.3 in defining the technology.