What is the Formal IEEE Name, Speed, and Informal IEEE Name of Ethernet?

The formal IEEE name for Ethernet in the context of the correct choice refers specifically to the 802.3 standard, which is the foundational standard for wired Ethernet networks. This standard initially defined the original Ethernet technology, which operates at a speed of 10 Mbps, and is informally known as 10BASE-T. This naming convention indicates an Ethernet protocol that supports baseband signaling over twisted-pair cables, with "10" representing the speed of 10 Mbps, "BASE" indicating baseband signaling, and "T" standing for twisted pair.

The other options relate to different variations of Ethernet standards under the broader 802.3 umbrella, which addresses higher speeds or different media types. 802.3u, for example, pertains to fast Ethernet operating at 100 Mbps, while 802.3ab and 802.3z are related to gigabit Ethernet, each catering to various physical mediums and transmission methods. Understanding the distinctions among these standards is important for grasping the evolution of Ethernet technology and its increasing speeds.