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. Given this information and what you know of
layered technologies, which of the following statements is true? (Choose all that apply.)
a. Ethernet works at the Data Link and Physical layers of the OSI model, and upgrades
to newer, faster versions of Ethernet can be made by changing only the components
that work at these layers.
b. Ethernet spans several layers and requires a new protocol stack to upgrade to new
c. Changes in technology at one layer of the OSI model don't usually affect the operation
of other layers.
d. Ethernet isn't considered a scalable technology.